The Orion Premium 20-Piece Color Planetary Filter Set is an ideal accessory for any backyard stargazer who enjoys observing the planets of our solar system. Since planetary surface details and atmospheric phenomena reflect sunlight as contrasting colors, you can use color filters to accentuate subtle details on planets, comets, and the Moon by selectively increasing contrast between features and markings of different hues. Simply put: using various color filters makes planetary details easier to see. You can also "stack" multiple filters to combine filtration effects for unique results. Each filter can also be used with filter wheels and/or filter sliders for quick and convenient swapping during viewing sessions to compare differently filtered views. (Filter wheels and filter sliders sold separately.)

A detailed summary of suggested uses for each filter is featured in the instruction manual that comes with the filter set, along with detailed transmission graphs for each of the 20 color filters.

The Orion 1.25" Premium 20-Piece Color Planetary Filter Set includes: No. 8 Light Yellow filterNo. 11 Yellow-Green filterNo. 12 Yellow filterNo. 15 Deep Yellow filterNo. 21 Orange filterNo. 23A Light Red filterNo. 25 Red filterNo. 29 Deep Red filterNo. 30 Light Magenta filterNo. 32 Magenta filterNo. 38A Blue filterNo. 44A Light Blue-Green filterNo. 46 Deep Blue filterNo. 47 Violet filterNo. 56 Light Green filterNo. 57 Medium Green filterNo. 58 Green filterNo. 64 Blue-Green filterNo. 80A Medium Blue filterNo. 82A Pale Blue filter.

An included metal storage case with die-cut foam interior keeps each filter secure, clean and safe during transport. A handy quick-reference guide found inside the metal storage case lid provides at-a-glance information indicating the best uses for each filter.