Archived posting to the Leica Users Group, 2004/05/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]But then again, you were talking about aperture blades. Sorry. > From: Philippe Orlent <philippe.orlent@pandora.be> > Date: Tue, 04 May 2004 22:05:39 +0200 > To: Leica Users Group <lug@leica-users.org> > Subject: Re: [Leica] Two sets of aperture blades? > > I only found a Contax TVS III with a double leaf shutter. > >> From: Douglas Herr <telyt@earthlink.net> >> Reply-To: Leica Users Group <lug@leica-users.org> >> Date: Tue, 4 May 2004 12:59:12 -0700 (PDT) >> To: lug@leica-users.org >> Subject: Re: [Leica] Two sets of aperture blades? >> >> Karen Nakamura <mail at gpsy dot com> wrote: >> >>> OK, am I on drugs or does Leica use two sets of aperture blades? It >>> seems on many of my lenses, that looking from the front, there is one >>> set (main set?) that closes down, but from the rear, there's another >>> set that gradually closes down and catches up at f/22 or so. It's >>> very odd. >>> >>> Is this to smooth out bokeh? Or am I seeing an illusion? >> >> Some lenses do have two sets of aperture blades. One I know of is the old >> 400mm f/5 Telyt. Methinks the purpose is to provide a nicely rounded >> aperture >> at all settings - in contrast to the typical auto-diaphragm lenses for SLRs, >> R >> lenses included - which degrade to a polygon at smaller apertures. >> >> >> >> Doug Herr >> Birdman of Sacramento >> http://www.wildlightphoto.com >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >>