Archived posting to the Leica Users Group, 2004/05/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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 >