and price ?

astrodon (6nm) is $695 vs baader (7nm) is $335 !!(for STL 11000)

p


--- In ap-gto@yahoogroups.com, kgkirkley@... wrote:

In a message dated 6/21/07 1:42:04 PM, chris1011@... writes:

I have been testing the Baader filters for the last week under all

kinds of

sky conditions. I do not see any halos around any bright stars. My

H-a

images
are very sharp with no reflections or ghost images around any

stars. Maybe I

am
mistaken about Astrodon filters (I have not tested them myself,

but go only

on what I have heard from others). I do know that several of my

RGB filters

in
my ST10 camera cause multiple reflection ghosts near bright stars.

I don't

know who makes these filters for SBIG, but they are not of the

quality level

of
the Baader series. In my STL11K camera I have installed 3 of the

narrow band

2"
Baader filters and the images they produce are super nice. All Baader
filters
have high grade multi-layer coatings on them to insure freedom from
reflections.

It may also be that the original poster's reflections are coming

from his

cover glass and filter rear surface, something that can't be

avoided unless

the
coverglass is coated with a multi-layer.

Rolando

Roland:

Thanks for the clarification.

Kent


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