Effect of focal length on image

Have you ever wondered why the selfie that you are taking with your phone is so bad while when you taking a photo a decent Nikon or Canon DSLR you get a nice portrait?

This happens due to the size of the sensor and focal length.  Since the sensor in your cell-phone is very small a lens with a very small focal length is needed to collect the light. You can see a nice demonstration of changing  focal length on the same scene:

An other demonstartion:



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