[Leica] 21mm M Biogon question

[alal at duke.poly.edu (A. Lal)]

Hi Henning,

Thanks for the reply. I'll try this method. 

Regards,
AKhil
----- Original Message ----- 
From: "Henning Wulff" <henningw@archiphoto.com>
To: "Leica Users Group" <lug@leica-users.org>
Sent: Tuesday, 24 June, 2008 7:52 PM
Subject: Re: [Leica] 21mm M Biogon question


> At 7:18 PM -0400 6/24/08, A. Lal wrote:
>>Hello Everyone,
>>
>>I picked up a 21mm Biogon/2.8 for the M mount and need a filter to 
>>protect the front element. Will a regular 46mm UV filter do, or will 
>>I need to get a slim filter to prevent vignetting  in the corners?
>>
>>Thanks in advance
>>
>>Regards,
>>Akhil
> 
> Easy to check on a film camera. Open the back, lock open the shutter 
> on B and look through from the front. If you can see light coming 
> through the corners of the film gate from all around the aperture, 
> there is no vignetting. If the filter rim starts blocking the view of 
> the film gate corners before the aperture does, you've got vignetting.
> 
> I doubt there's any vignetting with any filter. There definitely 
> won't be any vignetting with the M8.
> 
> Heliopan slim filters have threads on the front. Some others don't.
> 
> 
> -- 
>    *            Henning J. Wulff
>   /|\      Wulff Photography & Design
>  /###\   mailto:henningw@archiphoto.com
>  |[ ]|     http://www.archiphoto.com
> 
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