21st January 2004, 09:38 PM
21st January 2004, 09:45 PM
21st January 2004, 11:20 PM
huh? then how does film compact with zoom lens compare with zoom lens on SLR? I mean the sensor size (aka 35mm film) is the same what....how come the disparity in lens size?
22nd January 2004, 12:16 AM
dee, the effect is just like that:
a smaller lens usually has a shorter focal length, which translates to using a smaller exposure area or imaging circle... while for slr's, the lenses have a much longer focal length, so that there is a distance big enough for the light through the lens to fall onto the film/sensor.
22nd January 2004, 01:18 AM
25th January 2004, 06:36 PM
From THIS FAQ that NorthernLights posted ....
I think this is why SLR lenses are SO much bigger....
the popularity of SLR cameras caused the creation of many "retrofocus" lenses, lenses that have "virtual" exit pupils much farther away from the film than you would expect from their focal lengths. This was done to increase "back focus" (the physical distance between the rear lens element and the film or sensor) so that the rear elements of the lens would physically clear the swinging mirror in the SLR cameras.