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Hi,
There is a chart at the end of the extensive article on aperture here:
http://en.wikipedia.org/wiki/F-number

Student: "Zen master, why do you close your eyes?"

Zen Master: "To see more clearly."

"Reality" has always been elusive in art, and it is different from culture to culture. It always has been,...

Thanks, Ernest! That makes perfect sense.

Howdy all,
I was recently given a Korona Series V 5x7 that has a Turner-Reich 71/2-12-18 lens (serial number 76623). The lens is mounted in a Bausch & Lomb Volute shutter (serial number is 847650,...