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

[andrew fildes]

>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
>

Alright, alright....when do you want the Sigma back?  I can take a hint!  :)
Andrew



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