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With Mars:
#25 red enhances the dark markings and dims the image.
#23A red-orange enhances dark markings with less dimming
#21 orange enhances dark markings less, but also enhances dust storms some, with less dimming than the 25 or 23A
#15 dark yellow enhances dust storms and orange-yellow areas on the planet, like Hellas.
#12 yellow enhances dust storms and bright areas
#82A light blue enhances limb clouds, ice cap, and bright markings without dimming
#80A blue enhances limb clouds, ice cap and bright markings with a higher degree of dimming.
#30 Magenta enhances clouds, ice cap, dark markings all at the same time with little dimming.
TeleVue Mars B filter (the A is discontinued) operates like a #21 filter, only a little darker.
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