Archived posting to the Leica Users Group, 2001/05/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]SthRosner@aol.com wrote: > > In a message dated 5/16/01 11:22:00 AM Eastern Daylight Time, > icommag@toad.net writes: > > << why are cinema zoom lenses so much faster > than for still cameras? I have three Angenieux cinema zooms, all quite fast. > For example my 9.5mm to 57mm is a f1.9, my 16mm to 44mm is f1.3. >> > > How large is the film area these lenses are required to cover? Answer to your > question is your lenses are corrected to cover a much smaller image circle > than the 35mm format - 24X36. It's far easier (and cheaper) to compute a > lens, whether fixed focal length or zoom, to correct aberrations to an > acceptable level in a small image circle than a large one. > > Seth Rosner LaK 9 Another reason why half frame needs to make a come back. We could use cinema glass on the camera! But with modern design extremely sharp and compact lenses could be made. Now that we have T grain technologies and better developers are more accessible. Mark Rabiner Portland, Oregon USA http://www.rabiner.cncoffice.com/