DOF and Cropping take 2

Started Feb 11, 2014 | Discussions thread
justin23 Veteran Member • Posts: 4,347
Re: DOF and Cropping take 2

The way I see this is, say you are on an african safari with a FF camera and a APS-C camera and you have the same lens on each camera

You see a lion in the distance and the shot from the APS-C is good. With the FF you crop it and magnify it to the same size and guess what you get the same image with same FOV and same DOF.

When you think about it the same image is projected onto the focal plane and in one camera you capture more of that image than the other camera. but its still the same image captured at the same focal length with the same aperture.

The whole equivalence thing is about using a lens on the FF camera rather than using a crop and magnify, yet you'll get the same image with a longer lens and smaller aperture. There are many reason why this would be worse or better.

So we've been shown using the same lens and cropping and magnifying gives the same results, regardless of the format and this makes complete sense. Because the lens is not going to change the image it produces base on what is capturing the image.

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