There is a formula (which I should really have dug up, but anyway...) for
calculating the correct viewing distance for a print of a photo taken with a
given focal length so perspective is rendered "correctly" - it is the
mismatch of focal length and viewing distance that results in perspective
distortion - the problem is that, for example, the 'proper' distance for a
full-frame head shot with a focal lenth in the teens (with 35mm) ends up
being an inch or two from the page - hardly practical....!
Cheers
Andy
-------------------------------
The other is the
wide-angle perspective effects, which are often referred to as
"distortion". One can easily run into this problem with a 50mm. don't
believe it ? Grab one of your chilluns and pose them in strong light.
Use fast film. Set your 50mm at f/16-22, using the DOF scale set it
for a max of 3 feet. Now take a portrait of said child from about
12-18" from the top of his head. Bingo..."wide-angle" distortion.
This is why it is good to acquire a basic understanding of perspective
before launching into wides (or you can learn by blowing hundreds of
important shots).
*= Doris Fang =*
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