Lunch atop a (Springfield) skyscraper

Lunch atop a (Springfield) skyscraper
by andy-m                

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Jan
13
comment Is it possible to calculate focal length if you know the aperture?
Thanks, I'm going to read it now...
Jan
13
comment Is it possible to calculate focal length if you know the aperture?
I love you, it is so simple!! Thanks from the bottom of my hearth.
Jan
13
asked Is it possible to calculate focal length if you know the aperture?