Archived posting to the Leica Users Group, 2003/02/14

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Subject: Re: [Leica] Re: Hexar RF Back focus one more time
From: "Jacques Bilinski & Barbara Bradbury" <jbilin@axionet.com>
Date: Fri, 14 Feb 2003 15:05:59 -0800
References: <200302131714.JAA11678@mejac.palo-alto.ca.us> <a05111700ba71d2acb52f@[218.102.82.212]> <00fb01c2d3d8$e7153a80$6f01a8c0@jsbigrig> <008401c2d44e$ce94efc0$2dd871d8@jbilinsk> <p05100306ba73025aec3b@[209.53.33.241]>

> infinity. A Summilux wide open would show this discrepancy easily. A
> Noctilux would focus at about 12m with the same film - flange
> discrepancy; that is why it is easier to see with a wideangle lens.
>
I understand that with a wideangle a discrepancy would cause the lens to be
focused at a closer distance than with a longer focal length. My point is
that at the same f stop both images of an object at infinity would be
equally fuzzy.  Do you agree? I guess that when you are doing these tests
you are determining the distance of optimal sharpness. Then I can understand
that if the distance is closer with a WA it is easier to identify.


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Replies: Reply from Henning Wulff <henningw@archiphoto.com> (Re: [Leica] Re: Hexar RF Back focus one more time)
In reply to: Message from Cummer <cummer@netvigator.com> ([Leica] Re: Hexar RF Back focus one more time)
Message from "John Straus" <Mail@SlideOne.com> (Re: [Leica] Re: Hexar RF Back focus one more time)
Message from "Jacques Bilinski & Barbara Bradbury" <jbilin@axionet.com> (Re: [Leica] Re: Hexar RF Back focus one more time)
Message from Henning Wulff <henningw@archiphoto.com> (Re: [Leica] Re: Hexar RF Back focus one more time)