Focal Length Comparison Cheat Sheet
Understanding focal length can be difficult just from reading. To help you along we compiled this handy cheat sheet illustrating the effects that different focal lengths produce.
Click on the cheat sheet below to see the larger version, or simply drag and drop it on to your desktop to save.
Crop Factor Explained
Cameras with sensors smaller than full frame produce a narrower angle of view, because they capture a smaller section of the image.
Most digital cameras have a sensor that’s based on a small format called APS-C. To find the effective focal length of a lens (or the focal length you’d need for the same magnification on a full-frame camera) multiply the lens’s focal length by the crop factor.
For Canon DSLRs this is x1.6, and for Nikon it’s x1.5.