Friday, 11 August 2017

What is the "crop factor?"



I need some help understanding crop factor. I do get that the actual focal length doesn't change, but as far as field of view and how the image turns out is where I'm getting stuck. Anything that I've been reading online is not very clear on this subject. If anyone could explain how this works in a simple way, I'd appreciate it. :)



Answer




Crop factor is the ratio between a full frame sensor (36X24mm) and the sensor you're looking at.


Sensor Sizes


While the same photons go through your lens, a smaller sensor will only "see" part of them as you can see here:


CropFactorExample


The perspective does not change but because you're seeing only part of the image it seems that you magnify it, hence, 50mm lens on a camera with crop factor of 1.6 (meaning that full frame size/the sensor size = 1.6 )will act like 80mm lens on a full frame camera


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