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This Ultra High Contrast
(UHC) filter is great for giving the
maximum enhancement of nebula. It also
acts as a light pollution filter to
remove most artificial light. It
blocks all high and low pressure
mercury and sodium vapor lamp light,
neon lights and sky-glow. It is
excellent for both visual and
photographic applications. For visual
observations, this filter is great
under dark or somewhat light-polluted
skies. It greatly enhances nebulae and
comets relative to the background
light. While it is especially good for
nebula, by darkening the background of
space, this nebula filter provides a
better view of all deep-sky objects.
Photographically, a
good nebula enables deep space
photos of nebulae, star clusters and
galaxies to be taken even where you
have light polluted skies. It is
valuable even at good dark-sky sites
because it blocks the natural
sky-glow spectral line at 558 nm.
Because of this, it provides higher
contrast deep sky photographs.
Note that the
critical astronomical lines for
hydrogen beta, oxygen three, and
cyanogen are transmitted at close
to 100%. The unwanted light from
mercury vapor, high and low
pressure sodium, and sky-glow are
completely removed.
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These filters will fit
all major brands of 1.25" (31.8 mm) or
2" (50.8 mm) eyepieces. These brands
include Meade, Orion, Tele Vue,
Celestron, and our own Knight OWL
series. These filters are a great
value at this great price.
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