Understanding them will help if you’re shopping for a camera and comparing all of the different options. : New firmware version 1.0.5.Here are a few terms that come up a lot with medium format cameras. : Canon EOS R5 C training series is released. If you perform the "angle of view" calculation with such a lens, you end up with a horizontal angle of view of roughly 45º - which somewhat approximates about what the human eye can take in without having to "look around".Īt least using the angle of view of hte human eye makes more sense than using the diagonal, as long as it's confined to one dimension - presumably the horizontal, since that's where most peripheral vision lies. The highly touted "four thirds" format took its name from its (by that time) unusual aspect ratio, IIRC.Īn image shot at a "normal" focal length will seem neither telephoto nor wide-angle. ![]() I guess that had to be considered "normal" by definition, since very few TLRs had interchangeable lenses.īut there's an obvious problem with using the diagonal to define "normal": It depends on the aspect ratio, which varies from format to format, from time period to time period, and sometimes from camera to camera. If you perform the "angle of view" calculation with such a lens, you end up with a horizontal angle of view of roughly 45º - which somewhat approximates about what the human eye can take in without having to "look wrote: That works out to just over 27mm.įor a medium format 6圆 camera (6cm x 6cm) it's 85mm.įor a medium format 645 camera (6cm x 4.5cm) it's 75mm.Īn image shot at a "normal" focal length will seem neither telephoto nor wide-angle. The "normals" provided above are rounded values to the next highest even multiple of 10.įor any camera sensor, if you calculate the diagonal measure of the sensor (in millimeters) then that is the focal length of the lens that is considered "normal".įor a 35mm film camera (or "full frame" DSLR) the sensor measures approximately 36mm wide by 24mm tall. For a medium format camera (Rollei, Hasselblad, PhaseOne, etc.) it's about 80mm.īut there's a slightly more accurate math-based way to calculate "normal". For a 35mm film SLR (or "full frame" DSLR) a 50mm lens is considered a "normal" angle of view. There's a few accepted norms of what's "normal". GEAR: 5DII, 7D(x2), 50D(x3), some other cameras, various lenses & accessories It's a bit bigger than the 28/1.8, though. I use the EF 20/2.8 USM and like it alot on my crop sensor cameras. If you are actually looking for a moderate wide angle like 35mm on full frame, then a 20 or 21mm would serve nicely. But it's also a lot bigger, heavier and more expensive.) (The 24/1.4L would be closer to my preferred angle of view and is 2/3 stop faster. ![]() Now using some crop cameras, Canon EF 28/1.8 USM is my "normal" lens. so I generally used a 35mm or 40mm as my "normal". When I was shooting film, I always prefered something a little wider. Then all you have to do is decide how you feel about "normal". So, pick what you like best: 24mm to 40mm range. But 35mm is pretty close, and 40mm is only slightly telephoto. 30mm on crop comes the closest to the standard 50mm on full frame. ![]() IMO, on a crop camera a 24mm or 28mm can serve nicely as a slightly wide "normal". ![]() from 40mm to 58 or even 60mm on a film/full frame camera. What's been considered a "normal" or "standard" lens has varied quite a bit over the years.
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