1.25″ & 2″ Filters

Blue
Helps to increase structure detail when looking at galaxies.
Green
Enhances frost patches, surface fogs and polar projections on Mars, the rings of Saturn, belts around Jupiter and works as a general purpose filter when viewing the moon.
Yellow
Yellow filters help greatly in viewing Mars by bringing out the polar ice-caps enchancing blue clouds in the atmosphere, increasing contrast and brightening desert regions.  Yellow also enhances red and orange features on Jupiter and Saturn and darkens the blue festoons near Jupiter’s equator.
Orange
An orange filter helps increase contrast between light and dark areas, penetrates clouds and assists in detecting dust storms on Mars.  Orange also helps to bring out the Great Red Spot and sharpen contrast on Jupiter.
Red
Red filters help to make Mercury and Venus stand out from the blue sky when viewed during the day. Used in large telescopes, light red sharpens boundaries and increases contrast on Mars, sharpens belt contrast on Jupiter and brings out surface detail on Saturn.
Polarizing
Brings out contrast and definition, reduces glare and useful for moon-viewing.
Crystalview Moon & Skyglow
Moon and Skyglow filters improves blocking of mercury-vapor light and higher transmission at critical hydrogen-alpha and hydrogen-beta lines.  Bright light-polluted skies appear much darker and the contrast between object and sky is improved significantly. Moon and Skyglow filters allow maximum transmission of the important wavelengths of hydrogen-alpha and hydrogen-beta and doubly ionized oxygen most commonly emitted by nebulas.  Views of galaxies and star clusters are also enhanced slightly.
  H-Beta
The only way to see the Horsehead Nebula and the California Nebula. This filter is so specialized, it is really only good for two objects; IC 434, the emission nebula surrounding the Horsehead Nebula in Orion, and the California Nebula. Both of these objects emit strongly in the hydrogen beta portion of the spectrum. While it is possible, just barely, to catch a glimpse of the Horsehead without the H Beta, the view with it is far more stunning. The filter emphasizes the glow of both of these nebulae, turning them red. (Source: sciastro.net)
UHC
An Ultra-High-Contrast Filter primarily allows Hydrogen-Beta and Oxygen-III wavelengths to pass through.
OIII
A bandpass filter used to enhance the contrast of diffuse nebula by allowing the doubly ionized oxygen band through. 

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