RE: [OM] Wide filters - was Lenses: The Good, the Bad, and theAverage.

[Wayne Harridge]

Andrew wrote:


> I've been giving this some thought, esp. polarising a 21mm - the trick
> seems to be to use a much larger filter as close to the lens front as
> possible. For instance, the amazing 12mm rectilinear Voigtlander
> Heliar for
> the Bessa rangefinder uses a uses a step-up ring which clamps on to the
> nose of the lens (like many Oly hoods) and a 77mm filter. If they can do
> it...
> The simplest is a 49mm step up to a much larger size (i.e.62mm)
> which works
> for a standard thick polariser on the 21/3.5. I'm looking at alternatives
> for the 21/4 and 15/4.5 Voigt. lenses I own which are much more difficult
> (the 15mm has a built-on tulip - part of the barrel) and I notice that B+W
> have a Universal Holder which clamps on to the outside of the lens nose
> with three screws and then takes a step-up ring. It's made for lenses with
> no filter threads but it should be possible to place a filter's
> glass right
> on the front flange of the lens with this, if the lens has enough 'nose.'
> Size 3 is for 37-70mm size lenses. Probably awkward to use but if it's all
> there is...
> I'm also considering modifying an old metal or rubber hood - cut off the
> clamp ring and glue it to a step-up ring.
> There's always a way. Quality slim polarisers are ridiculous prices!

Of course you could always cut the lens in half and insert the filter
between the 2 halves - whys hasn't anybody thought of that ?

...Wayne


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