Archived posting to the Leica Users Group, 2007/04/01

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Subject: [Leica] Focus shift on 50/1.4 Nikkor on M8
From: hoppyman at bigpond.net.au (G Hopkinson)
Date: Sun Apr 1 23:50:12 2007
References: <001801c774af$6ab53db0$6501a8c0@asus930><000801c774b0$a61d9090$44300b44@GATEWAY><001e01c774b4$acb3d370$6501a8c0@asus930> <95237573-B54A-41E9-B04B-957CF566F333@btinternet.com>

Frank, see my earlier reply to Len. My mistake. I was thinking of SLR 
focusing.
Two separate issues, aren't there?
Does the lens agree with the rangefinder?
With no movement of the focus ring, does the point of sharpest focus remain 
the same as the aperture is varied?

Cheers
Hoppy

-----Original Message-----
Subject: Re: [Leica] Focus shift on 50/1.4 Nikkor on M8

How could this be the case on a rangefinder camera?
cheers
Frank

On 2 Apr, 2007, at 00:22, G Hopkinson wrote:

> OK, well I think that may add another variable. The focus point may  
> not be identical if you change the aperture AFTER focusing. I
> thought that the back focus (or front focus) issue was when the  
> rangefinder was coincident, at the shooting aperture, but the image
> has a different point of sharpest focus? This error would be most  
> visible with large apertures, and closer subjects, due to the
> inherent lack of DoF?
>
> Cheers
> Hoppy


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In reply to: Message from hoppyman at bigpond.net.au (G Hopkinson) ([Leica] Focus shift on 50/1.4 Nikkor on M8)
Message from jsmith342 at cox.net (Jeffery Smith) ([Leica] Focus shift on 50/1.4 Nikkor on M8)
Message from hoppyman at bigpond.net.au (G Hopkinson) ([Leica] Focus shift on 50/1.4 Nikkor on M8)
Message from Frank.Dernie at btinternet.com (Frank Dernie) ([Leica] Focus shift on 50/1.4 Nikkor on M8)