Quote:
Originally Posted by kkara4
RE crop sensor, an APS-C sensor is physically smaller than full frame. Hence you are only sampling a 40% fraction of the image circle produced by the lens, whereas a full frame sensor samples the entire image circle.
Hence you have an effective magnification of 1.6x a full frame sensor. The bulk magnification comes from the lens focal length eg 500mm = 50x.
A full frame sensor is 36x24mm.
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The APS-C crop factor varies by brand. For Canon it's 1.6. For Nikon and Sony it's 1.5
I've got a couple of Sony APS-C bodies (a200 and a77) and a full-frame a7s. The only lens I have that is 100% full-frame compatible is a Sigma 150-500 and switching the a7s between APS-C and FF mode makes a dramatic difference to the FOV. Now comes the wait for a larger range of FF E-mount lenses.