[Leica] 21mm M Biogon question

[hoppyman at bigpond.net.au (Geoff Hopkinson)]

You mean on a film M? I have the 4.5 version of the Biogon. I never saw any
mechanical vignetting on the M7 with a normal UV or a polariser. Definitely
not a problem on the M8. I think that the slim ones don't have any thread on
the front. That won't matter if you are using the bayonet hood though. Maybe
try any 46mm filter for yourself. Two test shots wide open with and without.
But if you have to buy a new one and the front thread doesn't matter for
you, the slim version is the logical choice. 

Cheers
Geoff
http://www.pbase.com/hoppyman/e
http://gallery.leica-users.org/v/gh/
-----Original Message-----
Subject: [Leica] 21mm M Biogon question

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 


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