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Lecture 15: Cameras & Lenses (16)

I'm wondering what is crop factor here, and how is it related to other parameters given here.


According to this website,, "Crop factor is the ratio of the sensor size to 35mm / full-frame. You take the provided crop factor number, multiply it with the focal length of the lens and you get the equivalent focal length relative to 35mm film / full-frame."


Adding on to that, larger crop factors in cameras have several effects on the resulting images, including a narrower field of view, increased magnification, increased depth of field, and often increased noise due to smaller sensor sizes.


Adding to @prannaypradeep999, I think that is why phone camera lens are often super wide-angle. Because only this way, the phone camera would have a reasonable 35mm equivalent focal length

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