Rethinking focal length conventions

Started 6 months ago | Discussions thread
TeddyD Senior Member • Posts: 1,108
Re: 6%

Phil A Martin wrote:

Pixel Pooper wrote:

Phil A Martin wrote:

Pixel Pooper wrote:

It depends on how the image is viewed. A focal length equal to the format diagonal gives a natural perspective when the viewing distance is equal to the image diagonal. Images viewed from closer have a shorter normal focal length, and images viewed from farther have a longer normal focal length.

People say this quite often here but where is your proof?

It's easy enough to prove it to yourself. Just look at any image from a distance from a distance proportional to the focal length and the perspective will appear normal.

No it doesn't and "from a distance proportional to the focal length!", who looks at photographs from 50mm, let alone 28 or 17mm ? Maybe you haven't explained it correctly?

You missed the diagonal part and what the heck you use usually to look your pictures? Viewfinder?

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