[Leica] Problem summicron uniformity

[nicholsj at edge.net (Jim Nichols)]

It's more likely that , since you must open up a stop or two when using the
filter, the problem is more obvious with the wider lens opening.

Jim Nichols


> [Original Message]
> From: Saganich, Christopher/Medical Physics <saganicc@MSKCC.ORG>
> To: Leica Users Group <lug@leica-users.org>
> Date: 12/7/2004 11:52:12 PM
> Subject: RE: [Leica] Problem summicron uniformity
>
> Possibility, I have to test that.
>
>
> -----Original Message-----
> From: lug-bounces+saganicc=mskcc.org@leica-users.org on behalf of Rick
Dykstra
> Sent: Wed 12/8/2004 12:33 AM
> To:   Leica Users Group
> Cc:   
> Subject:      Re: [Leica] Problem summicron uniformity
>
> I've used the same lens at the beach (in the water at times) without a  
> filter.   I didn't notice nonuniformity.  Could it be flare off the  
> filter?
>
> Rick.
>
>
> On 08/12/2004, at 4:27 PM, Saganich, Christopher/Medical Physics wrote:
>
> >
> > Hello
> >
> > I took my leica to the beach with my summicron ASPH 35 and Orange/red  
> > filter.  The shots all have noticable nonuniformity side to side.   
> > Darker on the sides then in the center by about one stop.
> >
> > Example:
> > http://www.apug.org/gallery/showphoto.php? 
> > photo=4185&password=&sort=1&cat=500&page=1
> >
> > I went back over other rolls and noticed the same thing even with my  
> > M2, but didn't notice this with other lenses.  I made a few test shots  
> > with my Voghtlander 35/2.8 with same filter and then made an identical  
> > shot with the ASPH Summicron 35, then without the filter.  Similar  
> > patterns were observed for both lenses but less so without the filter.
> >
> > The question is whar should I expect from these lenses in terms of  
> > exposure uiformity?  Is there a mechanical Issue with the shutter?  Do  
> > filters cause these issues?
> >
> > Thanks,
> >
> > chris
> >
> >
> >       
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