TELESCOPE EYEPIECE ASTRONOMY COLOR FILTER ORANGE 21 For Sale
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TELESCOPE EYEPIECE ASTRONOMY COLOR FILTER ORANGE 21:
$6
THIS EBAY AUCTION
IS FOR 1 HIRSCH COLOR FILTER,
#21-Orange
WITH BEAUTIFUL FILTER CASE.
ALL FILTERS ARE 1.25" IN SIZE, & ARE THREADED AND STACKABLE.
#21-Orange
(46% transmission)
The #21 orange reduces transmission of blue and green wavelengths, thus increasing the contrast between these areas and red or yellow or orange areas. It is great on Mars because of this. It sharpens the boundaries between these areas on the planet's surface. I also use it on Jupiter to sharpen the contrast in the belts and to bring out the Great Red Spot. It will also slightly increase surface details on Saturn.
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