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Condition:
This is a Celestron planetary filter set in the 2" size. These are in excellent condition with clean optics. This includes the original jewel cases for each filter, but no box.
Description:
Celestron Color Four Filter Set for 2-Inch Eyepieces: Planetary and lunar observation is almost always improved by the use of color filters. (ORGB) They bring out subtle details by selectively increasing the contrast among markings of different hues, and by reducing irradiation, the smudging of the boundaries between light and dark regions due primarily to turbulence in the Earth's atmosphere.
With the right color filter, suddenly the indistinct, pale bands of Jupiter resolve into loops and festoons. Delicate markings appear on Saturn's globe, and the Cassini and crepe divisions darken and solidify. Mars' polar caps stand out like tiny pearls, and vague lunar rilles acquire greater depth and contrast. Bad seeing becomes acceptable; good seeing becomes superb!
Because many planets have a characteristic color (e.g., Mars is reddish), a color filter will reduce the predominant hues to enhance contrast and uncover hidden surface markings. That's why the Red Planet is most effectively enhanced with a green filter!
About Each Filter:
#21 Orange Planetary Filter:
- sharpens boundaries between yellow-orange areas and blue-green regions on Mars
- sharpens contrast and enhance detail in the bands/belts and polar regions on Jupiter and Saturn and brings out the Great Red Spot
- increases contrast of lunar features
- low-contrast cloud detail on Venus
#25 Red Planetary Filter :
- Martian surface details in large scopes
- bluish cloud regions on Jupiter and Saturn
- contrast of Mercury against blue sky
- cloud definition on Venus
#58 Green Planetary Filter:
- contrast of blue and red structures on Jupiter (including Red Spot)
- melt lines around Martian polar ice caps
- Saturn's cloud belts
#80A Medium Blue Planetary Filter:
- details in Jupiter's cloud belts and Red Spot
- high clouds and polar caps on Mars
- lunar surface details
- Venus cloud features