Re: [APML] Sources for R64 82mm filter?

[Roland Roberts <roland@astrofoto.org>]

>>>>> "whw" == Wei-Hao Wang <astrophoto@gmail.com> writes:

    whw> B+W 091 or Kodak Wratten #92 is equivalent to SC64/R64.  You
    whw> can find 82mm B+W 091 on bhphotovideo.com.  The price is from
    whw> $72.95 to $112.95.  When a black and white filter says it's
    whw> "dark" red, usually it's equivalent to or at least very close
    whw> to SC64/R64.

I realize the Wratten #92 is an equivalent.  The B+W 91 is close, but I
thought from it's specs the cut off is a bit lower, equivalent to the
Wratten #29 which is more like an SC62.

Maybe that will work, I guess I have to try.  I have a 58mm Lumicon
"H-alpha" filter that works well here in my New York City skies; I'm
looking for something as red as I can get without cutting out the
H-alpha line.

If you, or anyone else, has used a Wratten #29 or equivalent in city
skies successfully, I'd love to hear about it.  It the poor man's
solution doesn't work, I may go for the Lumicon filter....

regards,

roland
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Roland B. Roberts, PhD                             RL Enterprises
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