Many people consider a roughly 150mm lens to give "normal" perspective at infinity. The focal length is roughly equivalent to the diagonal of the film, and the angle of view is roughly 45 degrees.
When we focus that 150mm lens close enough to give a 1:1 image, 300mm of bellows draw is required.
Some might say that the lens becomes a 300mm lens. Doesn't that also mean that the angle of view (as seen on the 4x5 sheet of film) is no longer 45 degrees ? Has the 150mm lens at 1:1 become the equivalent of a 300mm lens at infinity ?
If a 150mm lens is considered "normal" at infinity with regards to its angle of view and rendering of perspective, then is it no longer "normal" to the degree that we focus closer ?
To get a "normal" perspective at 1:1, why wouldn't be shoot with a 75mm lens ? After all, at 1:1 it will be a 150mm lens, no ?
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