[Leica] B+W UV filter on Elmarit-M 21/2.8

[Jim Laurel <jplaurel@microsoft.com>]

One note about using B+W filters on the Elmarit-M 21/2.8...  The first one I
tried at the local camera store made it impossible to put the hood on.  The
salesperson suggested we try another (identical model).  Voila!  Now, the
hood fits just fine.  Chalk it up to manunfacturing variances, I guess.

> I recently discovered (much to my disappointment) that I cannot use my B+W
> filters on my 21/2.8 ASPH with the hood! The diameter of the filters is
> too
> large! I contacted Leica in Germany and the reply was that Leica conforms
> to
> the ISO standard on filter sizes. Therefore B+W filter rings must not be
> manufactured to ISO standards.
>