Archived posting to the Leica Users Group, 2007/07/29

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Subject: [Leica] Licanon Exposure Question
From: len-1 at comcast.net (Leonard Taupier)
Date: Sun Jul 29 08:51:55 2007
References: <200707291232.l6TCTWDv006427@server1.waverley.reid.org> <000a01c7d1f0$c6a7cb30$b202e042@einstein>

Aram,

I found your findings quite interesting so I ran my own test. I used  
the same lens, the 35-70/4 (6 months old, latest version) mounted on  
a 20D with a Novoflex adapter. I got pretty much the same results you  
did. The exception is at f4 the exposure started at 1 stop  
underexposed. Starting at f4 and stopping down in full stops the  
shutter speeds were 1/1000, 1/400, 1/160, 1/60, 1/30, and 1/15 at f22.

I ran the same test on my R8 but got perfect exposure across all f  
stops. The results were 1/500, 1/250, 1/125, 1/60, 1/30, and 1/15.

This is pretty strange. It's a misty day today so the light is fairly  
uniform. My test was done at 70mm and ISO 400. I confirmed my  
readings with my M7 and 75mm lens. The results were identical to the R8.

Regards,
Len


On Jul 29, 2007, at 10:57 AM, Aram Langhans wrote:

> I finally got a focus confirmation adaptor and an eyepiece  
> magnifier for my Rebel XTi and have been quite disappointed with  
> its exposure performance using Leica R lenses.  I just conducted a  
> more scientific test and this is what I found.  Using the 35-70/4  
> zoom, it meters dead on with the lens at f4.  If I stop down to  
> f-5.6 if is 1/2 stop over exposed.  If I stop down to f-8 it is 1  
> stop over exposed.  This is consistent with what I found out  
> yesterday using the 50 when I was noticing some of my shots were  
> over exposed and other were dead on.  I am using either manual mode  
> or aperture priority metering mode.  Both do the same thing,  
> obviously, since AE mode is just duplicating what the meter says in  
> manual mode.
>
> I don't remember this problem when I would use the school's  
> original Rebel.
>
> Has anyone seen this?  Is there a solution?  (yeah, DMR or wait for  
> R10).
>
> Aram
>
>
> _______________________________________________
> Leica Users Group.
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In reply to: Message from dnaplasmid at compwrx.com (Aram Langhans) ([Leica] Licanon Exposure Question)