Archived posting to the Leica Users Group, 2009/03/05

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Subject: [Leica] potential focus issues
From: len-001 at verizon.net (Leonard Taupier)
Date: Thu, 5 Mar 2009 13:14:49 -0500
References: <DF43398C-52A9-4975-AEE7-F6B70980176A@reid.org> <02D78D3D-A764-4A71-BFFC-65E4D9F0712E@mac.com> <00cc01c99db7$6109ad90$80f510ac@chris0436b6050>
 
I just browsed the Fred Miranda reviews on this lens and did find a  
few comments about back focus. George's test is a good one. Try the  
test wide open and at several wider f stops to see if the focus point  
moves at all.

Good Luck, Elizabeth.
Len


On Mar 5, 2009, at 12:25 PM, Chris Williams wrote:

> What George said, but also I see plenty of posts on wedding forums  
> where the 24-70 seems to back focus on 30D and 40D's. They end up  
> sending in both lens and both to calibrate both, which if under  
> warranty Canon should do for free.
>
> Chris
> NOLA
>
> ----- Original Message ----- From: "George Lottermoser" Subject:  
> Re: [Leica] potential focus issues
>
>
> Ruff test:
> Lock it down on a tripod.
> Pick the center focus spot.
> Focus on 18" on a yard stick at 45?
> This should indicate whether the lens is back focusing, front
> focusing or dead on.
>
> Once you know that - more discussion can follow.
>
> Regards,
> George Lottermoser
>
>
> _______________________________________________
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In reply to: Message from elizabeth at reid.org (Elizabeth Reid) ([Leica] potential focus issues)
Message from imagist3 at mac.com (George Lottermoser) ([Leica] potential focus issues)
Message from leicachris at worldnet.att.net (Chris Williams) ([Leica] potential focus issues)