Sony NEX/Alpha/E-Mount (mirrorless-ILCE).Sony Alpha/Minolta AF/A-Mount (SLR/SLT-ILCA).MFT (mirrorless) Olympus OM-D/Olympus PEN/Panasonic G.L-Mount (mirrorless) - Leica SL/T/TL/CL, Panasonic Lumix S1, Sigma fp.The Bronica is currently selling at relative bargain prices.Adapter Rings Bellows and Follow Focus Lenses Over 35 years, I considered the Pentax 645 as an option, but I cannot get around its lack of mid-roll interchangeable film backs. If I were going to fully change over to a 645 system, I'd sell off my P67 system in full and buy Bronica Etrsi system to replace it. I have full P67 system with several bodies and many lenses. If you do not need to buy lenses for a parallel 67 system, the 645 lenses are generally less expensive. The 67 lenses, being designed for a much larger format than 645, are going to be in any focal length slower, larger, heavier, and have some bit less optical performance. The adapter does not fully enable the metering options of the 645. The only reason to use it and 67 lenses on a 645 is if you already own a bunch of 67 lenses and want to use a 645 without buying a whole new 645 lens system. The Pentax adapter allowing use of P67 lenses on the 645 models is fukky described above. Image Circle: Using a lens from a larger format camera on a smaller format generally works well enough, barring issues with distance to the film, but lenses for smaller formats may not project a big enough of an image circle to be used with a larger format. Try to learn this lesson from others rather than learning it for yourself. Some combinations 'work', but only at some focus distances, or only with the mirror locked up the entire time. The back of some lens designs are closer to the film/sensor than others of similar focal length - Be wary of smashing mirrors on SLRs. If you go down the rabbit hole of converting lenses to different cameras than they were designed for then remember two key things: So the 150mm lens on the larger 6x7 film will net you an angle of view similar to a 120mm lens on the smaller 645, but swapping the 150mm lens to the 645 camera will still give you a 150mm lens that will be similar to a 150mm lens specifically for the 645 camera. 'Crop factor' can be useful to roughly compare different lenses across different systems. You'll crop out a different part of the image circle with a smaller sized camera, but that doesn't change how the lens itself it working. So a 150mm lens on a 6x7 camera bends the light the same as it will for a 4.5圆 camera, and the same for a 35mm or smaller camera. If there aren't new glass elements in the adaptor, then it isn't going to change the focal length of the lens.
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