Hi Frantisek, Never thought about that, and thanks for pointing it out. I think a lens with say even 12 aperture blades would have a hard time opening and closing at 1/2000 second shutter speed. The knowledge on this list never ceases to amaze me. Steve Larson Redondo Beach, California
Frantisek Vlcek wrote: > but with auto-aperture and semi-auto-aperture the speed with which the > aperture closes and opens needs much less blades. That's why the 9 > blades are maximum, and 5-6 blades are usual. There's less stress on > the mechanism. With 18 blades, it wouldn't close as quickly as > required for 5 fps motordrive or 1/2000 time. - 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 .
