Astro Tutorial #1.8: Science behind telescopes - field curvature, coma corrector and light paths

Ғылым және технология

Old version. Watch: • Astro Tutorial #1.8: S... for enhanced audio and a coffee free version!
Hey folks!
This video it’s time for some science!
- Are all light beams from the same star?
- What is field curvature?
- Why are stars at the image edges always blurred?
- Why can’t I see the secondary mirror in my final image?
- …
Let’s find some answers to those more “in-depth” questions of telescope-science.
#Astroaddict
A link to Tims very helpful video about lens distortions and corrector lenses:
• About Field-Flatteners...
Thanks Tim (Astroaddict) for your great work!
Links:
Geogebra:
x wiki.geogebra.org/en/Referenc...
My sims of a reflection telescope:
x catchingphotons.de/youtube-up...
x catchingphotons.de/youtube-up...
x catchingphotons.de/youtube-up...
x catchingphotons.de/youtube-up...
Clear skies everyone!
Greetings
Chris
Hashtags:
#field_curvature
#coma_corrector
#reflection_telescope

Пікірлер: 30

  • @catchingphotons
    @catchingphotons3 жыл бұрын

    Old version. Watch: kzread.info/dash/bejne/g6CYltuyj6WYaMo.html for enhanced audio and a coffee free version!

  • @cosaelperro1972

    @cosaelperro1972

    Жыл бұрын

    I paused and had my own coffee sip; why would I take that away from you? great video. I'm new(er) to the sport of astroviewing and coma has been a problem, hence, found this video and it is really good. Thanks

  • @srinivasaiyer22
    @srinivasaiyer22 Жыл бұрын

    Absolutely the best explanation I have ever read or listened to .Thanks

  • @catchingphotons

    @catchingphotons

    Жыл бұрын

    Thank you Ranganathan for your encouraging comment!! I'll keep it going 😉 cheers and clear skies!

  • @SupeIex
    @SupeIex Жыл бұрын

    The visuals were super helpful for understanding coma! Amazing video!

  • @catchingphotons

    @catchingphotons

    Жыл бұрын

    Thanks a lot for your comment!!

  • @alejandrodegroote1721
    @alejandrodegroote17214 жыл бұрын

    Wow, I've seen a lot of videos about this topic in general, but this is the best explanation I came across so far. Thanks for sharing your insights!

  • @catchingphotons

    @catchingphotons

    4 жыл бұрын

    Thanks a lot Alejandro! I enjoy creating this tutorial. If it's of any help: all the better!! Clear skies! Chris

  • @waynerichardson1706
    @waynerichardson17063 жыл бұрын

    A lot of good explanation in your video. Answered a few questions I've always had. Thanks. Good work

  • @catchingphotons

    @catchingphotons

    3 жыл бұрын

    Thanks Wayne!

  • @lwkett
    @lwkett3 жыл бұрын

    fantastic video. great explanation, thank you!

  • @catchingphotons

    @catchingphotons

    3 жыл бұрын

    Thanks Lance! I really like this vid, too. It was quite a fun to play around with the simulations, I learned a lot myself ;-) Greetings - Chris

  • @adimeshort
    @adimeshort4 жыл бұрын

    What an excellent explanation, thanks!

  • @catchingphotons

    @catchingphotons

    4 жыл бұрын

    You are very welcome! :-) Glad you liked it! Clear skies! -Chris

  • @siddharthkumar2313
    @siddharthkumar23133 жыл бұрын

    Excellent videos, illustrations and explanations. Thank you. This is a blessing for all amateur sky-gazers.. Also, a small correction: angle is spelt incorrectly as angel(confused the hell out of me for a few seconds :-) )

  • @catchingphotons

    @catchingphotons

    3 жыл бұрын

    Thank you very much for your encouraging words! Haha :-) never spotted that specific typo, thanks. Clear skies!

  • @SuperBuickregal
    @SuperBuickregal4 жыл бұрын

    Thanks for clearing this up about this phenomena I have always wondered why the one mirror element was never seen in a mirror lens for photography but you always had that donut shaped bokeh effect in certain situations.

  • @catchingphotons

    @catchingphotons

    4 жыл бұрын

    Glad the video was able to help! We are 200+ now and you were one of the first! Clear skies dude!

  • @SuperBuickregal
    @SuperBuickregal4 жыл бұрын

    Responding to your question regarding focal length and f stop on the telephoto lens for my camera I was looking at a New FD Canon 500mm f/4.5 L with the Fluorite and UD glass and buying the Sky-Watcher EQM-35 tracker. I will eventual upgrade to a mirror telescope that I could use with this tracker. The Sky-Watcher Star Adventurer Pro Pack would be great for wide field photography but I want to do deep space photography also and as the saying goes buy nice not twice. I two have mirrorless cameras a Canon RP and R but I am also looking at the Canon M6 MkII with the crop sensor which would give me 800mm equivalent in a field of view. FYI I use IRIX wide angle lenses 11mm f/4 and a 15mm f/2.4 with good results and they are reasonable priced.

  • @catchingphotons

    @catchingphotons

    4 жыл бұрын

    The eqm 35 pro holds something like 10kg and therefore should do the job with a dslr and a lens. Keep in mind, that this is no transportable "star tracker". It's a small sized but full blown telescope mount. So its not easy to carry around and assemble in seconds. I wouldn't place a reflection scope ontop. It't too lightweight and even a smal Newtonian with DSLR and guidescope and guidecam and filter, cables... it adds up and you are up to 10kg easy and quick. EQ3 Pro and mounts in the same league are for smal refractors. And those are great! They offer you a wide part of the sky - many DSOs are MASSIVE in the sky and cant be captured with the smaller FOV of most reflectors. Greetings Chris

  • @SuperBuickregal

    @SuperBuickregal

    4 жыл бұрын

    @@catchingphotons Hello again Chris the egm 35 weighs in at close to 40Lbs and as you stated it would be cumbersome to haul around and it would be great for a DSR set up.To use a bigger telescope I would have to go the next step up at least with a HEQ 5 so I may just get the Sky-Watcher Star Adventure and use with my11/15/28/35/85/105/150/200/ mm lenses and get he experienced and then jump up to a real telescope and equatorial mount. My cameras are light weight 1st generation full frame mirrorless Canons the R and RP and this would be an easier setup to haul around for now. I would still like to get something in the 300-500mm range to round out the top though. PS: As you can see I like my primes! Thanks again Tom

  • @catchingphotons

    @catchingphotons

    4 жыл бұрын

    Hey! #Trevor from #Astrobackyard did a video just about a simple and "cheap" (relatively speaking) setup for getting started in DSO photography. He uses an old Canon and modded it himself, then a skywatcher Startracker,a dedicated filter and a cool F2 lens. Check it out: kzread.info/dash/bejne/ZpVs0rSiorfLj5s.html The ability to gather 60' subs enables you to dive deep in. The most important factor here though is the modification of the Cam. Most of the "reddish" fog in the nebula is HA and (nearly) not visible without modification. Greetings Chris

  • @mohammadshaad4331
    @mohammadshaad43313 жыл бұрын

    Brother i want to khow how to use the sims of reflaction telescope after downloading i cant run them from this video

  • @catchingphotons

    @catchingphotons

    3 жыл бұрын

    Download the program "GeoGebra": www.geogebra.org/download?lang=en Open the files and play around :-)

  • @evans383
    @evans3833 жыл бұрын

    I would refer to feynman for the explanation of why you can remove a tiny piece without perceptible loss of quality

  • @catchingphotons

    @catchingphotons

    3 жыл бұрын

    I thought I'd keep it easy :-)

  • @mohammadshaad4331
    @mohammadshaad43313 жыл бұрын

    #catchingphotons make video to use geogebra with after downloding My sims of a reflection telescope and how to use them. thanks

  • @catchingphotons

    @catchingphotons

    3 жыл бұрын

    That's not really the focus of this tutorial series :-) Try this one here: kzread.info/dash/bejne/Y5d2urmiZpmTpLw.html Greetings! Chris

  • @jadejamanoharsinhi6335
    @jadejamanoharsinhi63352 жыл бұрын

    Are powerseeker 127eq telescope is good?

  • @catchingphotons

    @catchingphotons

    2 жыл бұрын

    Hey Jadeja, the question is: for what purpose? With 127mm aperture and 1000mm focal length you will be able to observe the planets, rings of Saturn, moons of Jupiter and craters of the moon. Using a smartphone adapter for the eyepiece you can even take cool images. With that aperture you will be able to see some faint ghosts of brighter deep sky objects, but don't expect much. For deep sky Astrophotography the Telescope is presumably not fitted to reach focus on the camera sensor and besides the mount will carry the scope for entry level visual observation but not for imaging (not sturdy enough and not motorized). All in all: a solid visual scope for entry level beginner observations of planets and moon. Clear skies!!

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