At 04:56 10/30/00 , Andrew Fildes wrote:
>
>Sounds like a B+W - they have the heavier brass construction and I've seen
>some without the identification on the inner retaining ring where it's
>usually engraved (just so you can't read it if you stack them!)
Could also be an ancient Heliopan (they also use Schott glass) which have
very heavy brass rings. I have one marked only "Wz" which I finally
figured out was "_W_eich_z_eichner" a soft focus. The newer ones have thin
brass rings and the UV are at least single-coated.
>sizes for the SLR lenses. My B+W catalogue certainly doesn't list one
>although they'd probably make the Contax filters - Schott glass and all
>that. Seems a shame that an MC protection filter isn't available in various
>sizes from third party manufacturers. I suppose they can't be bothered
>given the tiny effect of 1A and UV filters.
I'd bet the Contax are made by Heliopan, which makes a "P" filter. See
their site here:
http://www.heliopan.de/
Go under "Produkte" and look for the "UV-Filter u. Protection" selection.
Use this to translate from the German if you need to:
http://babelfish.altavista.com/raging/translate.dyn
>2) Picked up a tiny N*kon 39mm filter lately for use with a Leica but does
>anyone know what the hell A2 is - I'm guessing at 'stronger than 1A' but,
>L37c isn't exactly obvious for a UV! (would love a UV in this profile if
>anyone sees/has one).
Yes, it's stronger than a skylight 1A but not like you think. :-)
The stronger "skylight" is a Wratten 1B. The Nikon A2 is a Wratten 81A
warming filter with a 1.2 correction factor. In the Nikon numbering scheme
"B##" are cooling filters, and "A##" are warming filters.
-- John
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