great information ... I use a Mamiya 645 complete set with a S1H setup.Your description of bending light to the sensor with these lenses is very helpful. Good video

awesome video Lee - thank you - it really gave me an idea what I could do with Medium Format, I have always been interested in it as the dynamic range photos taken with it are awesome. I would love to experiment some video ideas with it. Thanks for sharing your knowledge on this.

this was really informative and helpful. i'm now looking to buy one of theses adapters myself. They are hella expensive these days tho :(

Great video. I've been using the pentax and contax kipon baveyes since they first came out. Love them so much. In your video you talk about moving closer to achieve the same composition, but the idea is to actually use a longer focal length medium format lens to achieve the same 35mm focal equivalency. For example, one would use a 70mm medium format lens to get the same composition as using a 50mm on a full frame camera (70mm * 0.7x kipon crop factor = 49mm). The benefits of digital medium format is that using longer lenses allows for less lens distortion, and larger lenses have more resolution detail in the out of focus areas leading to a smoother transition between out of focus bokeh.

Lovely images. It is indeed a great way to get a medium format field of view if you also match aspect ratio and even better if you use a camera with a 16 bit sensor, you will then be able to match the output and colors.

The real test would be how big can you blow the image up without having to use AI or some algorithm. The beauty of medium is not just the look of the format the the image size you could get. It’s awesome to be able to use the medium format lenses but that’s just half of it. Great video.

I discovered the same thing when I picked up a relatively inexpensive SMC 645 200mm f/4 Pentax-A mount lens a couple of months ago. With a Fotodiox PT645-EOS adapter it makes awesome images on my 1D3 and 5D2 DSLR's. I haven't yet tried it on the M50 but that would need a different glass reducer. The (used) adapter only cost me AU$42.79 shipped from the UK.

@Lesterandsons

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I have a M42 200mm and I don't see the interest of MF unless you tilt shift

Up until now I have always been under the impression for medium format to require a sensor the size of the actual medium format (44 x 33 millimeters) or larger. Anything smaller than that cant ever be called 'real medium format' as the physical size just isnt there.

For someone who doesn't shoot film, which medium format lens is the most common?

Very well done and quite interesting! I‘m shooting landscape and fashion with a 5Dc, a 5D MK2 and a Hasselblad H2D-39. I‘m thinking about getting an old and cheap Sony A7 to try this exact medium format focal reducer, to compare it to my medium format camera, but I‘m not sure if it‘s worth it with the old a7. My budget is definitely too low for a new one though

@leecoreyphotography7188

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The A7 will work for that purpose but id suggest something with a newer sensor. A good high quality EVF as well.

@leecoreyphotography7188

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I just looked into A7 prices and that sounds like a good way to go, on a tight budget. I thought about getting one myself when I first looked into the focal reducer. I bought the M mount version because its adaptable to Sony, RF, and others. I switch between my Sigma FP and canon eos R. The eos R might be a good thing to consider too because you already have canon gear.

That 1.4 multiplication factor that you found just gives you the results that you'd get by dividing your sensor size with the focal reduction factor (0.7) 1.4 is close to the inverse of 0.7, which is about 1.4286. Or just use the formula apparent sensor size = actual sensor size / focal reduction factor You may just continue multiplying with 1.4, the result is almost the same anyway

I have the following medium format lenses for my Mamiya RB67: 50mm f/4.5 90mm f/3.8 140mm f/4.5 macro 150m f/4 soft focus 180mm f/4.5 250mm f/4.5 I would love to be able to mount these medium format lenses on my full-frame Leica M10 digital rangefinder. However, I really do not see the advantage of doing so. It would be easier and less expensive for me to use a non-optical adapter to mount my Nikon full-frame SLR lenses on my Leica digital.

What camera lens and adapter do you use???

@leecoreyphotography7188

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Pentax-a 645 lenses (35, 55, 150, 200, 300, 45-85, & 80-160) Kipon Baveyes P645 to Leica M x0.7 focal reducer.

@leecoreyphotography7188

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I also mount the m mount to my rf, and l mount

@diegopendinorodriguez4829

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@@leecoreyphotography7188 Excelent ! , but i prefer no baveyes, pure image on the sensor.

The only way I know is to make panorama to cover 1.4 time FF field of view to get MF look

That's a piece of good news to hear that finally someone did a speedbooster adapter for medium format lenses on 35mm fullframe camera... BUT 0.7 is not enough. The smallest medium format size is 60x45mm (the real pic is 56x42mm), the most used pic size is 56x56mm (6x6). So, just some calculations... It's a simple Pythagoras equation: ... ... square(A) + square(B) = square(C) ... ... C = squareroot( square(A) + square(B) ). The diagonal of the smallest MF pic (56x42mm) is squareroot( square(56) + square(42) ) = 70mm. The diagonal of the most used MF pic (56x56mm) is squareroot( square(56) + square(56) ) = 79.2mm. The diagonal of a 35mm fullframe pic (36x24mm) is squareroot( square(36) + square(24) ) = 43.27mm. Thus the "minimum" amount of the reducier should be -- 43.27 / 70 = 0.62x to get the pic of a 60x45 (crop factor is the reciprocal = 1.62) -- 43.27 / 79.2 = 0.55x to get the pic of a 60x60 (crop factor is the reciprocal => 1.83) Why didn't they make these instead of a common fullframe to APS-C reducer (0.71x)? (and for that quite hefty price...)

Don’t those adapters take away a stop of light the reason why that adapter adds a few stops ?

none of this makes any sense - a simulation is not the thing itself

That's not how it works chief

It adds to T-stop not F-stop. This is something that even manufacturers say wrong. F-stop increase would add to more defocused background as a change in bokeh. But that did not happen and that is impossible. So F-stop stays the same but T-stop gains one stop. It's a wierd thing i dont even know how to describe it properly.