What is the human eye equivalence of 35mm format?

I was pointing out that the perceived sharpness of both the image and the scene are different in that the eye cannot take in the whole scene in one sharp focus, whereas a camera image can, subject to the f stop control of dof determined by the photographer. And this will also vary according to the focal length of the lens and the f stop used.

The image you have shown appears to be exactly the same image, just cropped, which is not the same thing at all as using a different lens. I don't have actual samples at hand to demonstrate, but here is an extreme example to accentuate the point I am making. Iimagine the following. Use an 8mm focal length on a ff to take a portrait where the face fills the frame. You will need to be quite close to do this. Now use a 300mm focal length to take a portrait where the face pretty much fills the frame. The photos will be nothing alike, even though both just fill the frame with the subject.

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Mike Fewster
Adelaide Australia