"Equivalent apertures" are only for comparing DOF and low light capability (total noise) across formats. Two ways of getting to the same point.īut when it comes to exposure, the actual f-number is all that matters. Or you can just compare the high ISO performance of the cameras and say "this APS-C camera is 1 stop worse than my FF so I need a lens that's one stop faster to compensate". And it lets you shoot at the same shutter speed at a lower ISO to get a similar amount of noise in the final result. The inset square represents the crop factor of an APS-C sized sensor. 66/1.8 gives you the same DOF on APS-C as 100/2.8. The image below represents a full frame DSLR image (35mm format). Say you need 100/2.8 to get either the DOF you like or for low light at whatever ISO you're willing to shoot at on FF. You have an APS-C camera with a crop factor of 1. It's a handy way of comparing lenses across formats: Formula: The diagonal of a rectangle can be determined by a2+ b2 c2. This is another way of looking at the fact that FF has better high ISO performance than APS-C. This multiplication factor is the ratio of the size of the digital sensor to the dimensions of the 35mm film negative. Then find the 35mm full-frame focal lengths that most closely match those factors. Then calculate focal length FOV as a factor of your diagonal. To make one for your sensor, just find the diagonal using the Pythagorean method. Not that if you choose a FL to match the FOV, and choose the same f-stop (same light intensity or brightness) then the FF sensor captures more light over its entire area. Heres a table for the APS-C sensor in my Canon 30D (15mm x 22.5mm). The brightness is the same in either case.īecause the image has the same brightness (or light "intensity") the exposure stays the same. The light isn't concentrated on the smaller paper some of it is simply "wasted". Now replace the 8x10 paper with a 5x7" piece. The aperture of Super 35 is 24.89 x 18.66 mm in 4-perf. Super 35 in a digital format captures video in similar frame sizes to APS-C. In other words, 35mm full-frame equivalent focal lengths will be wider than the quoted focal length for any given GF lens. Since the GFX system has a sensor that is larger than full-frame, we can expect our crop factor to be less than 1. APS-C and Super 35 are often looked at similarly because of their close sensor sizes. For example, APS-C cameras typically have a crop factor of 1.5x or 1.6x. Hold it close enough to the wall that it just covers an 8x10" piece of paper. These sensors are used in cameras to capture light and convert it into. Imagine shining a flashlight onto a wall. The lens "projects" the same image at the same brightness, and the smaller sensor only "sees" part of that projected image. I would suggest, that the value should be better/lower than on FF, because of the additional light needed for FF, which is now concentrated on the smaller APS-C sensoīut it isn't.
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