12/29/2023 0 Comments Medium format vs frame crop factor![]() ![]() When you adapt a lens that was made for 24x36 film on APS-C, you only use a cropped portion of the actual image circle, so there is a crop factor to describe that portion and the resulting image impression based on the larger (aka full-frame, uncropped) image circle. So crop factors become relevant in systems that support more than one sensor size (like the mentioned Hasselblads, pretty much all legacy (D)SLR systems, but also Sony's new mirrorless system that features a mount that's used for APS-C and 24x36mm sensors). However, adapting Hasselblad H series lenses on this camera will result in a crop factor, because the H series covers a larger image circle. The new Hasselblad lenses for the new Hasselblad medium format camera are full-frame, too, as they are specifically designed for the 44x33mm sensor inside this camera. You'd have to adapt XF lenses to MFT cameras (or smaller) in order to achieve any crop. There is no crop factor on Fujifilm XF lenses, because these lenses have been designed for X-Mount and APS-C. So just use the crop factors if your focal length is not listed.ĭepending on what you’re trying to achieve,….size matters.The “ normal or standard”( the lens which gives a field of view closes to the “ normal” image as see from the human beings, is lens is the lens closest to the measure of the diagonal of the format in question. And probably most importantly,…it’s a piece of crap. Second, because it’s a dumb focal length. Like it would be kind of stupid to include every lens,….like Nikon’s Auto 43-86mm f/3.5 AI. Usually because they are not very popular. □ And, yes, I’m aware I “missed” some focal lengths. So, this is just to provide a reasonably accurate measurement in order to identify “equivalent focal lengths” to your full frame 35mm camera lenses that you know by heart. I know most people think they are exactly as marked, but that would rarely be the case. In fact, a 35mm camera lens called “50mm” could actually be 52.5mm or even 48mm if measured precisely. I don’t care, and neither do most people. So, please don’t write me to say the equivalent lens is really 42.098. What would put a monkey wrench into these numbers is that some of these aspect ratios are a little weird. Hence, a Hasselblad, Rollei, etc., 6×6 80mm lens is “about” a 50mm on a 35mm camera.Ĭrop factors are based on the diagonal measurement of the negative. ![]() Only with very wide angle lenses would you notice much of a difference with a few mm. (if there were such a lens) But getting an exact match is not really necessary. That would be the lens you would use on a 35mm camera for an exact match. For example, a 6×6 camera has a crop factor of. Basically, this is a number that will translate that medium format lens to what a 35mm camera lens would be. If you’re shooting a large format camera, (4×5), 150mm will be your “normal” lens. But, as with those crop sensor “equivalencies”, you’ll run into the same re-thinking of focal lengths in reference to film size. Less so with the advent of “full frame” sensors. People immersed in digital photography have been dealing with crop factors for years.
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