lol. this was very funny and i think many can relate. "where did you hear that its not dangerous?" "people on photography blogs."

@Astro_Aladfar

3 жыл бұрын

Same. It's not like coated with Caesium 137 with a half-life of 30 years but with Thorium 232 with a half-life on 14 billion years. That's three times LESS radioactive than Uranium 238.

@Liminaut0

4 ай бұрын

This isn't that dangerous... Lol I'm not joking I have a check source that's over 8,000 CPM.

Safety is one thing, but the thing that I don't see enough people mention is that the radioactivity in these lenses can affect your camera sensor. Short-term use and you'll notice that the RAW files taken with the radioactive lenses have significantly more noise (put lens caps on a radioactive lens and a regular lens, attache them to the body and take a few raw files at around 1/60th of a second and ISO 100. The radioactive lens will produce less uniform and much more colorized/randomized noise patterns). Longer-term use of radioactive lenses (say, leaving a lens attached to a camera body overnight or for multiple days) can affect the sensor performance even with non-radioactive lenses later on (issues with gamut frequencies and color phase issues that can affect pushing and processing RAW.). So, it's best to just use these sparingly and don't let them sit on your camera for hours-on-end. That, or use an older camera for them. I play around with my radioactive lenses on an old NEX-5R and the first version of the A7 , but I won't put them on my A7RIV. Just food for thought.

@harrison00xXx

Жыл бұрын

I used a takumar 50 1.4 on my Canon DSLRs for long and i didnt notice any degrading or damage to the sensor yet But i also have to say the old cameras i used these days had anyways HORRIBLE noise anyways. On my EOS R7 i also cant care less… i use a filter adapter with a clear insert and this glass blocks already the radiation. No problems yet on my cameras Remember, we just talk about alpha radiation, as long you dont smash the glass and breathe the dust its about 100% safe. In fact this lens could be even more effective as those „chakra“ or stones/crystals for health reasons since a very small amount is also gamma

@kalinmir

8 ай бұрын

@@harrison00xXx yes...dslr...there is a mirror shielding the sensor

@harrison00xXx

8 ай бұрын

@@kalinmir not on my R7 where its just a glass filter in the EF RF adapter, no problems so far despite having this lens sometimes for weeks on the cam

@harrison00xXx

8 ай бұрын

@@kalinmir to make the exposure even worse i didnt use the shutter down for a while and so the sensor is the most exposed, its just hypocrite to think this slight radioactivity can harm the sensor. Ever did x-ray experiments? The sensor literally starts to flash thousands of pixels nonstop and the camera itself gets slightly radioactive for a little time. Still no long time damage. I have read that you need about 500 Roentgen on a single pixel to theoretically damage it. Good luck testing it since this is for real MUCH radiation

@kalinmir

8 ай бұрын

@@harrison00xXx strange...didnt know that was a thing...tho im fairly new to photography

120 cpm are 0,0001 mS. You can sleep and hug every day your lens and nothing happens. The naturally radiation Source is actually 1-10 mS/a (pro year). And if you fly from germany to New York you have radiation to 80-100 mS.

Love how the count keeps climbing during the argument, like a thermometer that's so slow the food's burned by the time you learn the temp. (I imagine machines capable of rapid response are expensive.)

Interesting topic, as a hobby TIG welder I've sharpened "Thoriated" Red Tungsten electrodes several times in the years. From manufacturer "Up to 4 percent by weight of thorium dioxide is added to alloys" In recent years Thorium is not so common, now this is "With a lanthanum (III) oxide content of up to 2 percent by weight"

I think this will be the first 'lens review' where the price of the lens depreciates.

@0K4MI

3 жыл бұрын

Thats the gol, so that we can buy the better and more expensive lenses a bit cheeper ;D

Hahahahaha... totally the conversation that would happen at my house

Haha! Well done, you and your family! An interesting topic to delve more into. I was researching when I got my first thorium coated lens, and was surprised how hard it was to find any real information about how much radiation, and how reasonably safe they are. I'll keep an eye for the future videos to hear the information you present.

@cmdredstrakerofshado1159

3 жыл бұрын

Actually thorium in the lens is NOT a coating it is baked into the molten glass mix as it is manufactured . That being said as long as you do not keep the lens on you 24/7 or if your really worried a old lead X ray film bag transport and storage everything should be fine.

Paste regarding thorium lenses, from the nuclear Safety division in Norway: The regulations on radiation protection and the use of radiation (the radiation protection regulations) set a limit value for radiation dose to the eye, which must not exceed 15 millisieverts per year (15,000 microsievert per year). Based on this limit value, active use of the camera (aimed at the eye) should be limited to a maximum of 1 hour per day on average (375 hours per year). In addition to the potential dose to the eye, it is estimated that the potential radiation dose to the abdominal region is approx. 5 microsievert daily (assuming 6 hours of use per day). Provisions in the Radiation Protection Regulations state that the population shall not be exposed to more than 250 microsieverts per year from a single activity. In this case, it is equivalent to the camera staying near the abdomen for over 300 hours in one year. To sum up, if you are an amateur photographer and plan on using the camera for a limited time, you do not have to worry about the radiation from thorium lenses.

@michaelm1

3 жыл бұрын

Which lens was used for these calculations? Because there are several orders of magnitude differences in activity between various radioactive lenses.

@rodneywatkins4731

3 жыл бұрын

@@michaelm1 specifically, Takumar.

@michaelm1

3 жыл бұрын

@@rodneywatkins4731 Thank you. And would you know which Takumar? Super Takumar 50mm f/1.4 or SMC Takumar 50mm f/1.4? SMC version is significantly less radioactive than the Super.

@rodneywatkins4731

3 жыл бұрын

@@michaelm1 no, sorry. I asked them generally and mentioned Takumar. They also state that research in this field is few and far apart, and old (the following US research is quoted, which I have not reviewed: NCRP Report; no95. Radiation exposure of the U.S population from consumer products and miscellaneous sources, 1987).

@sreejeshsivaraman

3 жыл бұрын

@@michaelm1 I think it's Super Multi Coated Takumar. Some of the 7 element versions of normal Takumar are also radio active. Simon have a video on Takumar - kzread.info/dash/bejne/pXuTmJuCZJiuYs4.html

Have been really enjoying your content. Especially the Pentax lens review. I recently discovered some of my original Pentax K-mount lenses. Your review made me appreciate just what an incredible lens range they produced. In fact I recently purchased a late model Takumar 50mm f/1.4 based on your recommendation. The fact that it is radioactive is part of its charm. Though I have given a bit more thought when handling the lens. Waiting for Part 2 to find out what happens.

Now a perfect lens for bringing to my next trip to Chernobyl...

I HAVE TWO TAKUMAR 55MM 1.8 ONE IN MY SIDE TABLE AND THE OTHER IN THE BATHROOM AND THEY LIGHT ME WHEN I HAVE TO GO TO THE BATHROOM AT NIGHT I NEVER THINK THEY WERE TO USE THEM IN PHOTOGRAPHY. JAJAJAJAJA

@opadaaf

3 жыл бұрын

Did the Takumars also ruin your Caps Lock key?

Part #2 please , we are anxiously awaiting :)

@Simonsutak

3 жыл бұрын

I've nearly finished it!

All youtube videos and articles Ive seen are completely missing the point. Thorium is primarily an alpha emitter (but as many have pointed out still emits some beta-gamma). The beta-gamma radiation is not of concern as any camera will block all of the beta particles and the gamma waves will be attenuated to the point of harmless by the time they reach your face. The alpha radiation is only dangerous if it is ingested or inhaled (but very dangerous if it is). In normal usage the thorium contamination is fixed inside the glass and of no danger. However the real determining factor is whether any thorium particles can become loose if the lens is dropped or scratched. If these particles are on your hands when you eat they could impart significant alpha dose to the body. Please perform the following tests and you will be the smartest photographer on KZread and finally put this to rest: 1) Rub the radioactive glass onto a piece of paper and survey the paper with the meter. 2) use a coarse substance such as sandpaper on the glass and survey it. 3) scratch the lens with a needle or knife and wipe the knife onto the paper, and survey the paper. 4) the ultimate test is to shoot with the lens all day and without washing your hands, survey your hands. If all of these tests do not detect Thorium contamination on the papers/hands, the lens is perfectly safe. Remember to keep the object being surveyed far away from the lens or other radioactivity (coffee, brazil nuts, etc) to avoid cross-contamination.

@Simonsutak

3 жыл бұрын

Thank you for this...some of your suggested experiments I've been planning to do, but sandpapering the glass is not an option, and avoiding washing my hands all day in the current environment is not on either!

@nanobanana

3 жыл бұрын

@@Simonsutak Haha very understandable! Thanks for doing a service for the vintage lens community. I really look forward to seeing someone finally test if any loose contamination can be liberated from the fixed radioactivity in the lens!

@michaelm1

3 жыл бұрын

​@@nanobanana You'd need a lot more sensitive equipment to test that properly. You'd need to detect trace contamination and normal Geiger counters don't do that.

@miam1074

3 жыл бұрын

@@Simonsutak please don't consider doing such test. it is incredibly harmful, and whoever is suggesting it should do it himself!!! Just a note: if you happen to drop your radioactive lens and the glass element breaks or fractures, you can pretty much remove anybody from the house and seal it, as it is now a contaminated site.

@nanobanana

3 жыл бұрын

@@michaelm1 It depends on the sensitivity of the equipment but if it is picking up 500+ counts from the lens, it should have some response if any contamination is picked up by the paper. Any response of the counter over background would be very interesting to me.

Several lens manufacturers in the 1960s were looking for ways to create new types of glass with a high refractive index and a low chromatic aberration. They started to use rare earth compounds, such as fluorite and quartz, even radioactive thorium dioxide (ThO2). Quartz and fluorite are quite expensive and hard to produce. For other lenses they added small amounts of thorium dioxide to the glass, but only in the rear or front lens group. The radioactivity (alpha radiation) of the thorium dioxide may cause self-degradation of the glass (turning it brownish yellow over time). Not all lenses turn yellow, however. Alpha radiation is effectively shielded by a few centimeters of air, paper or the thin layer of dead skin cells that make up the epidermis, so it is not particularly dangerous. The rear cap of the lens will block most of the radiation effectively and there is no danger of fogging the film or damaging the sensor in a digital camera. Radiation levels are stated in microsievert per hour (μSv/h). A set of dental radiographs will expose you to approx. 5 μSv of X-rays. If a lens was to emit 5 μSv/h, it would generate the same dose of alpha radiation in 1 hour.

@harrison00xXx

Жыл бұрын

Thanks! There is one more thing to say: Its ONLY dangerous if you would smash the glass element, turn it intentionally into dust and breathe it... sounds very impossible to pull off in the first place unintentionally.

Lmao, when your counter switches over to Chernobyl Per Millisecond instead 🤣

Enjoyed this :-) Wasn’t sure if you were serious but probably best not to keep those in a dense metal box. That actually increases gamma output unless the metal is very thick indeed. You want 5mm Aluminium or 10mm Perspex if you want to stop the beta while not increasing the gamma. However, I just keep them in a leather pouch and stay more than a meter away when I’m not using them 🤪

That dialogue with THAT British accent, albeit obviously ( _well_ ) scripted , nevertheless brings an exquisite satisfaction. It's way better, than parts in "Oxford" books my kids are studying

@Simonsutak

2 жыл бұрын

Thank you!!

how do i know for sure if my lens is radioactive? as we just saw not everything said on the internet is true btw my only vintage lenses right now are the Tuper Takumars

Nice vid! Does anybody know if the Minolta Repo S from 1962 has a radioactive lens? It's a bit yellowed and I'm a bit concerned whether if it is radioactive or not.

I'm not sure I should be laughing, but I am! I've ended up with three copies of the early Pancolar 50/1.8 (also one of my favourite lenses) all bought cheap due to mechanical issues and fixed. I believe they're rumoured to have more than one radioactive element so give strong readings from the front and the rear (?). They live in the same cabinet as a chrome nose Canon FD 35/2, a Minolta MC 28/2.5 and some other possibly radioactive glass; I wonder how many clicks that combo would generate ;-)

I do have an old Takumar 55mm f/1.8. These Takumar lenses are so radioactive the cpm is measured not in three figure but up to five figure numbers. Check out "RADIOACTIVE LENS! Takumar 55mm f/1.8" by FAME CHeRRy and "Radioactive Camera Lens" by antiprotons.

Really a very interesting video. Learned a lot and I’m interested in your readings. You should publish your results on some place.

I definately need to buy a geiger counter I have a couple of "suspect" Takumar lenses and just out of curiosity want to see how radioactive they are.

I'd be more worried about Radioactive Lenses being left on a camera and damaging the sensor...

@roybixby6135

3 жыл бұрын

@@steinar.offroad Thanks for the heads up...

@ChristopherCobra

3 жыл бұрын

If they didn't destroy the film that was used in the cameras - they are not going to harm the sensor.

@flagger2020

3 жыл бұрын

I wonder about that too esp as when working with DOE our dose measuring blue bages (dosimeters) held film as the detector.. I think between the mirror, it's support plate and metal shutters were enough to reduce effects. RFs with cloth shutters might have been different.

@roybixby6135

3 жыл бұрын

@@steinar.offroad I dont believe in obsolete...

Hey! I recently bought a Auto Sears 135mm f2.8 m42 mount version and was wondering if you know if this lens is radioactive. I can't find much information on the internet Cheers!

Dear Simon; Good Day!First of all, your videos as well as shots through vintage lens are marvellous.Recently i have bought S1235576 SMC Pentax A-50mm F1.7mm.Afterseeing all these radio active lens video,I am little bit scared to use as it may affect my baby.Can i know is there any way where we can find whether my lens are radio active or not through serial number?

@Simonsutak

2 жыл бұрын

Hi, it's OK, the SMC Pentax-A 50mm f1.7 lenses are not radioactive. I have one and it's a really good lens.

I’m interested in using Pentax screw mount lenses on K mount bodies, both film and digital. I wondered if you could recommend a good adapter which is easy to attach and remove and also allows the lens to focus to infinity.

@Simonsutak

3 жыл бұрын

I use and recommend an original Pentax-made K mount to M42 adapter, and it works just fine for infinity. I can remove it with my finger nail!

Can't wait till Part 2. I doubt there will be a Part 3. LOL

Hahaha Waiting for the next episodes!

"I read a lot about these lenses before buying one and they say it's not dangerous." "But dad, what do they know? They're just old men like you."

As an owner of quite a few radioactive lenses, I have considered fabricating an aluminium box (1/2 inch thick is overkill) to cope with the beta. The gamma is difficult to attenuate, so I wouldn't bother. The alpha almost doesn't matter if you wear clothes and even skin (which, happily, I do!) also glasses help. I would like the aluminium box to be large enough to accommodate an old Spitfire compass and some other objects with a fair bit of radium paint.

@stardustastro

Жыл бұрын

I covered one of my Ikea Kallax shelves with some steel plates from the inside which helps a lot against Betas and some Gammas. Best practice probably would be to just keep some distance. ;)

Oh, damnit, I was actually determined to buy a Super-Multi-Coated Takumar 35mm for my BMPCC 4K, because I was really interested in vintage lenses. Now I‘m a little bit concerned. Should I be worried about my health? P.S. Great video 👍

Ok. I seriously laughed out loud.

I got a Takumar 58/1.4 with thorium in it right after my daughter was born and my wife, a professor in public health, was none too happy. Nice to hear lanthium isnt really hot at all.

I recently acquired a Super Takumar 50mm f1.4 and a Super Multi-Coated 55mm f1.8. I thoroughly enjoy them. Watched numerous KZread videos claiming they aren't dangerous. After finding out wife is pregnant, I'm all of a sudden searching the web again... I'm super worried.

Hi Simon is the Canon FD 50mm f/1.4 S.S.C. Radioactive? One result on google from forum Denied it. Camerapedia have NO Record of it. Could you test it and make a Video?

@Simonsutak

15 күн бұрын

I'm sorry, I don't know. Do you own this lens? I do need to choose a Canon fast fifty to buy/try - maybe this should be the one. (I was also thinking about an early f1.2, which I think is radioactive).

Why am I imagining Mummy Pig and Daddy Pig having this argument about keeping the lens?

Hahaha. That's the funniest thing I've seen today! I have the same lens and I don't wanna let it go...and I don't even know why. 😁

You would probably be in greater danger by absorbing lead from handling any lead box you may be using than from radiation you are parrying. And, of course, lead is much, much softer. Particles will always become airborne from any handling. I'll be waiting to see your research on that.

@Simonsutak

Жыл бұрын

Yes, I look into using lead-lined boxes but decided not to use them for the reasons you state.

...Meanwhile there's an ionization style smoke detector in the bedroom hallway with a chunk of Amercium-241 inside it!

Would the ones that are more radioactive fog film?

@Simonsutak

14 күн бұрын

I've not tried it, but I believe that if you left the lens in front of film it might slightly yellow the film directly behind the lens - in the same way that it can yellow white paper.

I have limited myself to only 2 radioactive lenses (kind of arbitrary) - a Takumar 50mm 1.4 and a Yashinon 50mm 1.4. Both of them send my more primitive Geiger counter nuts! I bet you have a Takumar lying around to test, if you could dear sir.

@Simonsutak

3 жыл бұрын

Yes, I'll include tests of the Takumar 50mm f1.4s in a video. Interestingly, I have two copies of the same version, from different years, and one is quite radioactive and the other isn't. My Yashinon 50mm f1.7 is quite radioactive, guess they like the glass!

@Just-a-bystander

3 жыл бұрын

I have several. With more coming in the post. I wonder .. I bought an aluminium case to store them, I wonder if I should line with lead.. and maybe get a Geiger counter

@k3i0

3 жыл бұрын

@@Just-a-bystander lead is also not very healthy

@k3i0

3 жыл бұрын

@@Just-a-bystander i have 2 takumars but i bought them locally - i did not want to get them shipped and open a box with a broken lens and full of radioactive dust.

@Just-a-bystander

3 жыл бұрын

@@k3i0 so true

patiently waiting for part 2

@Simonsutak

3 жыл бұрын

Apologies...we've been distracted by a seriously leaking roof in the heavy rains. I'm working on Part 2 now and will post it next week (beginning 22nd February).

@richardsizemore9293

3 жыл бұрын

@@Simonsutak Life happens, Thanks for the update. Love your channel. You have hooked me on these lenses and I now have a Yashica Auto Yashinon-DS that is radioactive, besides that I have purchased the SMC Takumar 1:1.4 that is also radioactive...as well as the newest version of the Helios 44-2,..... keep the videos coming!

That is exactly why I'm not buying a Geiger counter :-)

Lol - I hope nothing actually got thrown out! I wonder, is the glass pink or smoke on those lenses? We have doped glass here and it eventually turns brown or pink.

@Simonsutak

3 жыл бұрын

Some of my lenses have brownie-yellow glass. I'll be explaining this in Part 2...coming soon!!

Cool video! :-)

Youth are so kind, "what do they know, they're old men like you", and it doesn't matter if you get cancer and die as you're old.. I'm glad they know everything as always and care so much about themselves.. When they get to our age they will have more wisdom.. and love of photography

Simon, come on!! I need Part 2. I need to know if it all ends in a 'it's me or the lens' situation before I tell my wife I have just bought the Super Takumar 50mm F/1.4. I'll need time to pack my camera gear :)

@morrisbagnall2690

3 жыл бұрын

Sorry, it's the Super Multi Coated not the Super Takumar. I guess I was just nervous!

@Simonsutak

3 жыл бұрын

I'm sorry, I've been distracted by events...but I'm working on Part 2 right now!

I was irradiated just watching this video! 8-)

How many CPM does this detector show when you put on 1kg of bananas, or 100g of potassium salt (KCl)?

@Simonsutak

3 жыл бұрын

I don't know, but I might try going to the food store and aiming it a bunch of bananas!

If she goes upstairs I go downstairs to catch them... seriously, she would create something slughtly similar to radioactive fallout or a dirty bomb if the lens hits the ground and shatters. And I guess this is a very important thing: if the radioactive elements shatter, they could be inhaled or get into contact with skin and likewise. If you consider what is said about beta radiation which is harmless unless e.g. digested (like poisoning someone), a broken lens glass might be even more harmful.

@Simonsutak

3 жыл бұрын

Yes exactly. Throwing the lens out of the window, and the glass smashing on the ground, would be the worst thing you could do.

Bought a couple projector lenses from the Ukraine of late.. I thought it was odd that they stated the lenses were tested for radiation and they had none.. my mind was thinking Chernobyl .. which is possible I guess, but I suppose they were also from the Thorium days as well.

hmmmmmm, time to stop keeping my super takumar under my bed...

You might want to check your neighbours fish pond. Lol.

I just got a Pancolar Zebra. Is it dangerous or not??

@kerder8660

3 жыл бұрын

It is.. Hehehe specially when to close behind.. Powerful kicks.. Hehehe ask lions..

@meta4101

3 жыл бұрын

Only the early Pancolar Zebra 50mm f1.8's have thorium elements and they are actually far more valuable ... so check the serial number and trade down to a non-radioactive zebra if that's your thing. I am sticking with the radioactive version.

@diforbes

3 жыл бұрын

Thanks. I checked and mine is a later serial number. No yellow cast either.

Simon, did I tell you about using sheets of plexiglass to block the radiation? Forget the metal boxes.

@Simonsutak

2 ай бұрын

Many thanks, I'll try plexiglass.

What your counter shows is only the "Counts per Minute" wich is quite irritating, because it only shows that there is a radiation. but not the intensity or kind of radiation. the real physical unit is sv (sievert). And sievert is an indication how harmful the radiation might be. So you have to test it with an other mesurement or your own knowledge of you will be that the lense has some radiation. but not which type or how harmful it is. but im looking foreward to your future videos ;)

@Simonsutak

3 жыл бұрын

Thanks, yes I’ll be showing these measurements in another video.

@0K4MI

3 жыл бұрын

@@Simonsutak Thats nice. im waiting for it (:

Don’t go to the beach fellas the sand is radioactive 😬

Fun! Throw the lens into my window! Will your counter differentiate between alpha, beta and gamma? Do a 7 element Takumar 50 1.4 next!

@trinityharbour7054

3 жыл бұрын

Answered my own question: this counter reveals: beta, gamma, x-ray. It doesn't show alpha. Which is too bad, because the reading would be insanely high. Insanely high=improved family reaction!

@Simonsutak

3 жыл бұрын

Yes, that's what this simple Geiger Muller Counter measures, as I'll explain in another video. And yes...I know...I just couldn't afford to use counter that measures alpha, for various reasons, including insane family reaction. Although it would be better for click bait, so I made a mistake on that (wink wink). I'll be testing all my Takumars and all the other lenses. The relative CPM levels will be interesting. As I mentioned under another comment, I've already found that two versions of the "same lens" have quite different readings....and fortunately I know why!

Funny... I thought every photographer was aware that the formulation of a lot of optical Crown and Flint glass both old and modern may contain a good percentage of lanthanum. The use of lanthanum is even prior (1930) to that of thorium. www.schott.com/advanced_optics/english/knowledge-center/technical-articles-and-tools/abbe-diagramm.html Or maybe it was not clear that, for example, LAF means Lanthanum Flint, LAK means Lanthanum Crown? Guess what was the typical composition of the types of glass that Leitz Wetzlar used for their best lenses... Besides - on the Pancolar you are not measuring gamma, but beta since alfa would be blocked by the plastic body of the counter, if the tube is inside . You can try to put a sheet of paper between the geiger counter and the lens to see if it makes any big difference and if it does, then you know you should start a complaint with GQ Electronics. You can then proced by interposing a thin sheet of metal (aluminum?) or plastic (Perspex will do - check the documents in my reply to Andrew H here below) to block the beta radiation. If you register no changes in the radiation level, then your lens was probanly produced between 1964 and 1967 with optical glass containing thorium, which was bought by German producers from an English supplier (Leitz started to use this glass in the 50s). Later versions of Pancolar 50mm are not radioactive: for example my Pancolar Auto (s/n 49756) and Pancolar Electric MC (s/n 9708143) are not.

@Simonsutak

3 жыл бұрын

Many thanks. I'll try those experiments in the next video(s).

Ahhh...why I “lost” my old radiation meter! Lol! ☢️

Your future as a KZreadr is secure!

@Simonsutak

3 жыл бұрын

Ha! Hope this is a compliment? I wasn't sure I should post this video....but Part 2 should be less quirky.

@seoulrydr

3 жыл бұрын

@@Simonsutak Yes - the intent of my statement is to compliment your video. I look forward to even more quirky and even quirkier videos from you in the future! You have raised the bar. You have no one to blame but yourself. Ok - and maybe your family as they were complicit!

*laughs in 4,000cpm Super Takumar*

Those detectors can’t pick up alpha.

Ironically, in my house this conversation would be generationally reversed! Secretly looking forward to moving out after the lockdowns end, in part so I can try out some of these lenses without my dad getting in the way (and he's owned a few himself before getting rid of them, so I wouldn't be able to just sneak those past him, either!)

You know if there is excessive radiation when it fogs the film ! ☢

@giaimeginesu9889

3 жыл бұрын

Or when you get your cranial shadow superimposed...

Great. Throw the lens out of the window, shatter the radioactive glass and make it into dust you can breath in. The lens isn't particularly dangerous unless you strap it to your body and sleep with it every day, but it actually becomes dangerous if you shatter the glass and eat it or breath it in. Thorium has a biological half-life of 30 years if I'm not mistaken. Though you excrete most of it and only about 5% makes it into your bones. Still. Please don't throw these lenses out of windows. Donate them to me instead:-).

Hahahahahah, that's really funny!)

I have the zenitar and tomorrow I will receive Panacolar:))))))

Were Nagasaki and Hiroshima not enough? Respect humanity, don't throw those lenses out the window! Get a box of depleted uranium and keep it in the fridge! (Lol) Thanks for this vídeo... Waiting for part 2.

Haha! Cute!!

What was the background count?

@Simonsutak

3 жыл бұрын

Interesting question, because when I first got the counter, it seldom registered any background count. But now the counter has been contaminated from being close to the Pancolar. So the starting point for the measurements is higher, and all future measurements will have to be relative to that starting point. That’s OK, as I’m more interested in whether the counter moves up with specific lenses or not.... than highly accurate readings.

Put them in your pocket, they'll make a great contrseptive 😜😜

@jeffdrew625

3 жыл бұрын

Is that a Zeiss in your pocket or are you happy to see me? 🤣

LOL...

I own a: Carl Zeiss Jena Flektogon 20mm f4, and a: Yashica Auto Yashinon DS 50mm f1.9 I left one of them on my old X-T10 without knowing it was radioactive (I got a defective GM counter) and in 7-8 months the camera died from software issues, basically it progressively got worse and worse, it went from crashing when using flash, to crashing when using auto mode, to just turning on but not able to take a picture, to just turning on and only displaying a white screen.. with all the menus and settings.. eventually her jaw fell off. now I am reluctant to use these lenses on my X-H1, even though I absolutely love them..

Hahaha nice one

Lmao

Its totally safe , safer then your cellphone and Wifi router if you want to know , and GM counter wont tell you that , i will

Super Funny video

Thorium emits mainly alpha (not gamma radiation) which is generally regarded as non hazardous because it does not penetrate solid objects well (eg skin.) The main hazard for thorium is intake is through inhalation or ingestion of particles which in a solid glass lens is a non issue. Thorium doped tungsten electrodes are commonly found in welding but are slowly being phased out because there is a slight risk or ingesting or inhaling dust particles generated by the frequent need to grind new sharp points at the end of the electrode rod. Their use is generally regarded as safe here in the US by OSHA but recommends regrinding tips in a well ventilated area and washing hands after.

@michaelm1

3 жыл бұрын

This is a common myth about thoriated lenses. The thorium decay chain includes beta and gamma emitters. So thoriated lenses emit alpha, beta AND gamma. After all, you can see it in the video, the Geiger counter used cannot measure alpha, so what you see is beta and gamma.

@miam1074

3 жыл бұрын

wrong

@andrewh2341

3 жыл бұрын

@@michaelm1 you’re totally correct about the decay side products but the main emission is alpha. Radon gas in home basements is a similar alpha emitter and generally we talk about increased risk of lung cancer from inhalation but acknowledge that the decay products do lead to gamma emitting dust particles also. If you take the approx clicks per min being measured by the geiger counter and assume that about 120cpm= 1uSv it would take between 1000 and 1300 hours of holding that lens in direct contact with your body or 24,000 hrs of having it sit a few inches away to expose yourself to the same amount of radiation the average person is exposed to annually (6mSv). To put that into perspective I more often than not eat a banana with breakfast which has about 0.1uSv of radiation from K40. My annual banana consumption is equal to about 6.5hr of holding that lens directly against my body or 120hrs having the lens sit directly next to me. The bigger concern is not the end users exposure but the factory workers who can be in intimate contact with the raw concentrated materials all day long and exposed to dust from the manufacturing process. This is similar to the poor souls that had to paint radium onto wrist watches all day long.

@patriziodalessandro1693

3 жыл бұрын

@@andrewh2341 Wrong. A lot of Thorium's daughter isotopes emit gamma. This is known since the very beginning and still today, due to the military use of thorium in tanks, jet and helicopter engines. core.ac.uk/reader/192871840 www.nrc.gov/docs/ML0635/ML063530621.pdf assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/946164/JSP_392_Chapter_29_-_THORIUM__Alt_Text_.pdf And stop eating all those bananas or you'll suffer from hyperkalemia.

@larryreedman7728

2 жыл бұрын

I’ve been using these lenses with SLR and DSLR, both Pentax, for about 50 years and I’m still not blind!

Here's an idea that I just thought of. Place a EMF blocking sticker on the camera body. Underneath the LCD panel of your camera. You could always stick them on the front and rear caps.

I will give you my address.... Please send me the Pancolar if you don't want to have it in your house ..I take care of it ☝🏻😇..... 😁 Greetings from Berlin, Denis

DON'T THROW THE PANCOLAR ZEBRA 50mm f1.8 OUT THE WINDOW ...

Radiation Hysteria...

now im not buying it

The drama was really unnecessary.

@Simonsutak

3 жыл бұрын

It was supposed to be theatrical ;) I'll try to clear up the points in Part 2.