As you know, cameras like the Canon 5Dmii are coveted for their large full frame sensor. Cameras like the Canon 7D and Nikon DX series cameras use APS-C size sensors. They’re smaller and more affordable. There are a litany of lenses to choose from that properly fit both cameras. It’s important to note, there is a zoom factor of 1.6 when you attach a full frame lens to an APS-C camera, meaning your 20mm lens is now a 32mm lens.

This short video shows you a shot by shot comparison using the same lens on both the 5Dmii and 7D. You’ll immediately see the compromise in wide angle, when using the 7D. It should also be noted that using videocameras with chips that are even smaller with increase the zoom ration using the same lens.

Below is a handy lens conversion chart for your use.