19th September 2003, 01:15 AM
2 Burning Questions pls help: Aperture size and rangefinders
pls help me with the following:
1. Aperture are they EXACTLY the same size for ALL lenses? For example, F2.8 on a 17-40L is it the same aperture diamater as F2.8 on a 50/f1.4?
2. What are rangefinders? how are they better / worse than conventional SLR?
19th September 2003, 07:58 AM
1. F-stop is ratio of focal length to aperture.
eg f2.0 for 50mm lens: aperture = 25mm diameter (?).
f2.0 for 200mm lens : aperture = 100mm diameter.
2. Try this:
Last edited by StreetShooter; 19th September 2003 at 08:01 AM.
19th September 2003, 11:35 AM
thanks street shooter... appreciate the reply
19th September 2003, 01:15 PM
this mean for fixed aperture zooms, the physical aperture actually opens up as you zoom in? cool, never knew that.