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Forum: Pentax DSLR Discussion 03-13-2017, 03:31 PM  
understanding the 1.5 crop factor
Posted By zapp
Replies: 37
Views: 4,674
Since we want to elaborate on the subject. The key reference feature in a camera is the pixel pitch. The more pixel you have the larger is the sensor, but everything related to resolution, i.e. DOF, is related to pixel pitch. Angular coverage per pixel is a function of focal length and pixel size.
With a correct idea on pixel pitch you can understand why a 300 mm lens in MFT format has great magnification power, but resolution per pixel is limited due to its tiny size. Similarly the signal to noise concept is a function of pixel dimension.
What really sucks in APS-C vs. FF discussions is that all K-mount lenses are designed to fit FF DSLR light paths - the mirror of a fullframe camera still goes up and down. The image circle may be less than fullframe, but the rear lens element has to be further away than it would have to be. This is troublesome for wideangle lenses as you will end up with more glass and distortion than necessary. For tele lenses there is no disadvantage.
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