>From: "Terry and Tracey" <foxcroft@xxxxxxxxxxxxxxxxxxxxxx>
...
>I posted once that I heard you should not use an f stop smaller than your
>focal length/4. This seems to work.
Got it! I'll make damn shure I don't stop that 300mm down below f75! :-)
Like most "rules of thumb," this doesn't seem to apply to thumbless
persons. It would seem to only be useful for normal and wide lenses, since
even a modest telephoto of 100mm would allow f22, which is often the
minimum aperature.
The rule-of-thumb I've always heard and used is "stop down two or three
stops for maximum sharpness," but I've never seen the rationale. I guess
you have to test to be absolutely sure of a lens's "sweet spot."
: Jan Steinman <mailto:jans@xxxxxxxxxxx>
: 19280 Rydman Court, West Linn, OR 97068-1331 USA
: +1.503.635.3229
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