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Hi
Eddie,
This has been a subject of constant debate among photographers
(not just astrophotographers) for years.
Shool
#1 believes that if you pay top dollar for a very high quality piece of glass,
then you do yourself an optical disservice to place another piece of relatively
inexpensive glass in front of it. Your lens is protected more by
using a lens hood than with the UV filter, so why put another optical
surface in front that the lens was not designed to have?
School
#2 believes that it is necessary to protect the lens and that, like chicken
soup, it can't hurt <g>. For astro work, of course, you can add in
the issue of blue halos.
I have
always followed School #1 and opted to leave off U/V filters for all my
photography, unless they are specifically necessary - e.g. atmospheric haze in a
landscape shot. I do not use them for astrophotography,
and have not had any chromatic abberation issues (blue
halos).
If you
do decide to use a U/V haze filter, then I would recommend that you invest in
the best quality glass possible. I use B & W (Schneider) filters
exclusively for this purpose.
FWIW,
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