Why not? The angle covered is still in proportion to the focal
length. But at macro distances, the angle reduces significantly. At
1:1 it is half the angle ar infinity. So the shutter speed
requirement goes up proportionately.
I do not really think that the angle of acceptance changes because of
the focusing distance. The focal length of the lens does not change
according to focus distance. Your 90 mm macro lens is twice as far
away as a 50 mm when you are 1:1.
--
Winsor Crosby
Long Beach, California, USA
mailto:wincros@xxxxxxxxxxx
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