![]() ![]() For big telephoto lenses this tends to balance out - a 300mm f/2.8 on full-frame isn't so different from a 200mm f/2 on a crop sensor (320mm f/3.2 is equivalent in Canon terms) at shorter lengths, shorter and faster lenses may simply not be available. Since the same angle of view gives you a larger physical aperture, you have more ability to produce a smaller depth of field at the same aperture on a larger sensor. At the same f-stop, any two lenses will give a full-frame camera more light for the same reason. Conversely, although teleconverters balace things out a bit, crop sensors tend to have the advantage for telephoto activities like wildlife.Īny given lens is "faster" on a full frame camera (the bigger sensor captures more light leaving the lens). Still, if you want wide angles, full frame tends to have the advantage. Mirrorless cameras should have an advantage here, but since the angle of light starts being an issue in very wide lenses on digital sensors it's not that clear cut. Because the mirror box size is fixed by the lens mount (although EF-S gives a bit more leeway because of the smaller mirror), it is harder to design a good wide-angle for a crop body than for a full-frame camera. Some very wide lenses only cover the crop sensor area (and are EF-S lenses, unless terminology has changed since my day, so they won't mount on full-frame Canons). ![]() You can also think of a crop body as being a perfect 1.6x teleconverter - with the exception that the camera doesn't show you the "reduced aperture" and therefore doesn't show you the "ISO reduction".Īny given lens is "longer" on a crop body (you get more reach for the same pixel count in the sensor, but less angle of view). So a 160mm lens at f/3.2 and ISO 256 on a full-frame body behaves like a 100mm lens at f/2 and ISO 100 on a crop body. The other way around, a full-frame body produces an image that is the same as a lens 1.6 times shorter and 1.6 times faster (in f-stop) produces on a Canon crop body, shot at 1/2.56 times the ISO. Making the lens 1.6 times longer gives you the same angle of view reducing the f-stop by 1.6 times on this lens gives you the same depth of field increasing the ISO compensates for the reduced amount of light coming through the smaller aperture. In terms of "equivalence" a Canon crop body produces an image that is the same as a lens 1.6 times longer and 1.6 times slower (in f-stop terms) will produce on a full-frame body, shot at 2.56 (1.6 squared) times the ISO (which cancels out the f-stop reduction). everything I say here applies to any crop format, except for the specific numbers.) (Excuse me moonlighting from the Nikon forum. ![]()
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