On Mon 2001-09-24 (13:32), Ivan Prenosil wrote: > It can't be (as people sometimes say on this list) as simple as > lens diameter divided by focal length; otherwise my FA28-70/4 > could not be constant aperture zoom :-) Constant aperture is done by adjustment 'tricks' of the efficient aperture - the diaphragm blades can be closed for shorter focal lengths. In fact I don't know why this should be done. 28-70/3.5-4.0 should be superior to 28-70/4.0!? Regards Martin - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
- lens brightness Nicholas Wright
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- Re: lens brightness Ivan Prenosil
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- Re: lens brightness William Robb
- Re: lens brightness Martin Trautmann
- Re: lens brightness Pål Jensen
- Re: lens brightness Martin Trautmann
- Re: lens brightness Martin Trautmann
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- Re: lens brightness HUDERER Bernd
- Re: lens brightness Martin Trautmann
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- Re: lens brightness Collin Brendemuehl