*GN(ft) = GN(m) x 3.3* Butch Black wrote:
The sigma is GN 50m @ 100ASA, 105mm zoom reflector setting. The Pentax one is GN 54m @ 100ASA, doesn't say what zoom that's at.If you multiply by 3 do you roughly get your guide numbers in feet? Butch
--When you're worried or in doubt, Run in circles, (scream and shout).
