*Focal Length, Crop Factor and Field of View

How does sensor size actually affect focal length?

Focal length?  Effective focal length?  Actual focal length?  Crop factor?  Do you get more reach with a crop sensor?  Is it equal to a longer focal length?  There are some misconceptions surrounding what happens when a lens is used on cameras with different sensor sizes.  Let’s have a look at the differences between a full frame, APS-C and micro 4/3 sensor.

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