Rethinking focal length conventions

Started 7 months ago | Discussions thread
Phil A Martin
Phil A Martin Veteran Member • Posts: 6,341
Re: 6%

Pixel Pooper wrote:

Phil A Martin wrote:

Pixel Pooper wrote:

For natural perspective the relationship between viewing distance and image size should be the same as the relationship between focal length and sensor size. If the focal length is equal to the sensor diagonal, the viewing distance is equal to the image diagonal and if the focal length is half the sensor diagonal, the viewing distance is half the image diagonal. This, as you said earlier, is part of the ABC of photography and is explained here in The Manual of Photography:

Then what's the disagreement? A 43mm lens on full frame gives natural perspective at the viewing distance described. A 28mm or a 135mm will not give natural perspective at the same viewing distance.

My point is that a 43mm lens does not match the perspective of the human eye, it matches the perspective of an image viewed from a distance equal to the image diagonal. If you view your images from closer it might be 28mm that matches the perspective, and from a bit farther it might be 65mm. There is nothing special about 43mm except that it matches what was once considered "standard" viewing conditions.

So basically you are saying that the conventions of decades are wrong and that there is no such thing as a standard lens.

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