Archived posting to the Leica Users Group, 2003/04/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Because of this (focal length differences aside) I sometimes think I should have bought a 75mm lux before the 90mm AA as my long M lens to compliment my 35mm Lux ASPH. (90mm @ f/2 and 1/125 vs 75mm @ f/1.4 and 1/60) Obviously rounding the shutter speeds. James PhotoWrite no archive D Khong wrote: > Now I am itching to ask, > How do you arrive at the gain in two stops? 50mm f/2.0. Largest aperture: f/2.0. Slowest usable shutter speed: 1/60s (or 1/30s). 35mm f/1.4. Largest aperture: f/1.4. Slowest usable shutter speed: 1/30s (or 1/15s). The shorter focal length typically lets you get away with one stop slower shutter speed. Total gain = two stops. M. - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html