Celestron Series #4 4 Piece Filter Set (1.25") Yellow #8, ND 0.9 Neutral Density #96, Violet #47 & Pale Blue #82A

Celestron offers four convenient filter sets, which contain four different filters per set. Not only are these highly useful filter combinations, but they also offer an economical way to add versatility to your filter collection.

#8 Yellow 83% T
All observing information for this filter is the same as that given for the #12 and #15 Deep Yellow filters, with the exception of the following:
Mars - Improves the Martian maria by reducing scattered light from blue areas, while allowing passage of more green light for studying yellow dust clouds. Comets - Brings out highlights in yellowish dust tails and enhances appearance of comet heads.

ND 0.9 Neutral Density #96
Moon - Excellent for reducing irradiation, glare and subject brightness. Colors are unaltered, as light is transmitted uniformly over the entire spectrum. Each model performs somewhat differently, depending on the brightness of the moon.
Planets - Stacking in combination with color filters lowers transmission, but retains true color balance for specific applications. Reduces glare on brighter planets and minimizes irradiation.
Binary Stars - Helpful in splitting binary stars, because it reduces glare and diffraction effects around the brighter star of the binary pair.

#47 Violet 3% T
Mars - Useful for detecting high clouds and haze over the Martian polar caps. Very useful during the violet clearing. Mercury - Helpful in detecting faint features. Saturn - Good for ring structure studies. Venus - Increases contrast of dark shading in upper Venusian clouds. Comets - Useful for observing brighter comets.

#82A Pale Blue 73% T
Moon - Enhance lunar detail. Jupiter - Enhance the boundaries between the reddish belts and adjacent bright zones. Useful for viewing the Great Red Spot. Mars - Very useful during the violet clearing. Helpful in studying surface features and polar caps. Mercury - Improve observation of dusky surface markings at twilight, when the planet is near the horizon. Saturn - Enhance low-contrast features between the belts and zones. Venus - Useful for increased contrast of dark shadings in upper Venusian clouds. Comets - Bring out the best definition in comet gas tails.