Archived posting to the Leica Users Group, 1996/09/13

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To: leica-users@mejac.palo-alto.ca.us, leica-users@mejac.palo-alto.ca.us
Subject: Re: lens flare
From: "Roger L. Beamon" <beamon@primenet.com>
Date: Fri, 13 Sep 1996 07:02:40 -0700 (MST)
 
At 11:42 AM 9/13/96 +0100, Mark_Bishop@ipc.co.uk wrote:
>My experience is that lenses may suffer more flare at small apertures, not
large
>ones. If the principal cause of flare is internal reflections, and these are
>more likely to come from metal than glass surfaces (due to modern coating
>techniques) then it follows that the conditions for flare are least at maximum
>aperture (when there is little or no intrusion by the iris) and most at small
>apertures. Certainly my 35 1.4 Summilux-M ASPH can give flare under certain
>circumstances at f/8 down, whereas I've never seen the phenomenon at f/1.4.

Thanks for that, Mark. Sounds like a good empirical observation that I've
never come to. Didn't do this kind of shooting back east in the US!
     --
     Roger Beamon,  Naturalist & Photographer
                               Docent:  Arizona-Sonora Desert Museum
                               Leica Historical Society Of America
                               INTERNET:  beamon@primenet.com