The fallacy of 35mm "equivalent focal lengths"

Started 3 months ago | Discussions thread
OP Tony Beach Forum Pro • Posts: 11,933
Re: The fallacy of 35mm "equivalent focal lengths"

Pixel Pooper wrote:

Tony Beach wrote:

My point is there is no such thing as an "equivalent focal length" because all focal lengths have their own unique characteristics.

They don't though. All the focal length tells us is what angle of view to expect on a given sensor size.

By invoking one limited aspect of a focal length as its used on a given sensor the other equally important aspects of that focal length are explicitly being disregarded.

What are these "other aspects" of the focal length?

Aperture size mainly. With the big jump from a 1/1.7" format to 35mm format diffraction limitations from the smaller aperture play a role as well.

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