Hey there
How it was explained to me is use a Tape Measure......
Mark the tape measure off in fstop-inches...
Say you start with a 4" lens and have a total bellows length of 9"
2.8" 4" 5.6" 8" 11" 16"...etc
^ ^
You have a 2+ a 1/3(?) fstop-inch extension and that is also your extension
factor.
( +2 1/3 stops)
(sorry Europe but there really is a use for inches....)
have a great Saturday
andy
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Received on Sat Dec 1 10:25:32 2001
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