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Color Filters

Colour filters are usually being used for planetary and lunar observations and they usually help to increase contrast of surface features or cloud compositions. The difference is usually subtle, but sometimes can be quite dramatic. It might seem to be a paradox, but colour filters supress their own colour and highlights their complementary colour. i.e. the Great Red Spot will not be more visible with a red filter, but a green or blue filter will certainly enhance it's contrast as it'll be darker than its surrounding. Here are some recommendations for the most common colours:
DARK RED: above 150mm aperture. Offers extreme contrast above 200mm. Provides very high contrast of the Moon, polar caps of Mars and it's an excellent choice for observing Venus at daytime as it blocks blue, so the sky appears black
RED: same as dark red but for apertures above 100mm: Moon, Mars and Venus at daytime
LIGHT RED: recommended from 60mm aperture, for very high contrast of the Moon and for the observations of the polar caps of the Mars (from 100mm aperture)
ORANGE: from 80mm aperture. Reveals details of the atmosphere of Saturn and Jupiter or with larger apertures even some details of Uranus' atmosphere.
DARK YELLOW: from 120mm. Increases contrast of surface features of the Moon, clouds of Mars and reinforces atmospheric structures of Jupiter (i.e. Great Red Spot).
YELLOW: same as dark yellow but from 80mm aperture. Very good for observing the Moon (reduces blue chromatic aberration of achromats, thus increases contrast)

GREEN: from 60mm. An important universal contrast filter. Strong enhancement of surface features of the Moon. Very good for low magnifications. Enhances reddish structures in the Great Red Spot on Jupiter. Also good for Mars and Saturn.
DARK GREEN: Same effects as as green, but
from 100mm. White spots in Satrun's atmosphere represented better from 200mm aperture. 
LIGHT BLUE: from 50mm. An important universal colour filter for small telescopes. Brings contrast enhancement to many solar system objects.
BLUE: from 70mm. General contrast strengthening for the Moon - away from the terminator. Very good for increasing contrast in the bands of Jupiter and Saturn. Good for comet hunting: enhances the contrast of the tail.
DARK BLUE: from 100mm, but
ideal from 150mm aperture. Same as blue.
VIOLET/PURPLE: from 150mm aperture. Enhances the dark clouds in Venus' atmosphere, highlights the structures in Saturn's rings and it can even be used for Mercury with very large apertures... 
Grey (neutral density): Moon and Venus, also used in Herschel Wedges or in conjunction with Astro Solar Safety films (front cover for all types of telescopes) for solar observations. Generally used for reduction of brightness. 




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$14.08
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SKU: 365902
365Astronomy
365Astronomy 2" to 1.25" Filter Adapter
 
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The 365Astronomy 2" to 1.25" Filter Adapter lets you use 1.25" filter with 2" accessories. We could also call it M48 to M28.5 adapter due to the real thread sizes.

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$4.75
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SKU: Castell-FIPAg
Castell
White Transparent Plastic Filter Case
 
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Filter CaseIt's a more or less transparent, white plastic case for one 2" filter or four 1.25" filters. Recommended for Castell Deep Sky OIII and UHC filters as those don't come in filter case....

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$32.33
in In stock (3)
SKU: 365550-COLOUR-SET
SkyWatcher
365Astronomy No 550 Lunar & Planetary Filter Set - 1.25-inch
 
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This high quality colour filter set contains 3 colour filters and a neutral density filter for planetary and lunar observations. It comes in a foam lined plastic screw top storage case. Size: 1.25"Material: optical quality gl...

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$32.33
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SKU: 365551-COLOUR-SET
SkyWatcher
365Astronomy No 551 Lunar & Planetary Filter Set - 1.25-inch
 
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This high quality colour filter set contains 3 colour filters and a neutral density filter for planetary and lunar observations. It comes in a foam lined plastic screw top storage case. Size: 1.25"Material: optical quality gl...

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$32.33
in In stock (3)
SKU: 365552-COLOUR-SET
SkyWatcher
365Astronomy No 552 Lunar & Planetary Filter Set - 1.25-inch
 
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This high quality colour filter set contains 3 colour filters and a neutral density filter for planetary and lunar observations. It comes in a foam lined plastic screw top storage case. Size: 1.25"Material: optical quality gl...

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$32.33
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SKU: 365553-COLOUR-SET
SkyWatcher
365Astronomy No 553 Lunar & Planetary Filter Set - 1.25-inch
 
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This high quality colour filter set contains 4 colour filters for planetary and lunar observations. It comes in a foam lined plastic screw top storage case. Size: 1.25"Material: optical quality glassFilters included: #15...

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SKU: F08
Castell
Castell #8 Light Yellow Planetary Filter 83% Transmission
 
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Planetary Colour Filter #8 Light Yellow 1.25-inch (83% transmission, M28.5x0.6) Spectrogram of transmission of some colour filters; only for demonstration purposes....

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SKU: F11
Castell
Castell #11 Yellow/Green Planetary Filter 78% Transmission
 
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Planetary Colour Filter #11 Yellow/Green 1.25-inch (78% transmission, M28.5x0.6) Spectrogram of transmission of some colour filters; only for demonstration purposes....

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SKU: F15
Castell
Castell #15A Dark Yellow Amber Planetary Filter 68% Transmission
 
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Planetary Colour Filter #15A Dark Yellow (amber) 1.25-inch (68% transmission, M28.5x0.6) Spectrogram of transmission of some colour filters; only for demonstration purposes....

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SKU: F21
Castell
Castell #21 Orange Planetary Filter 46% Transmission
 
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Planetary Colour Filter #21 Orange 1.25-inch (46% transmission, M28.5x0.6) Spectrogram of transmission of some colour filters; only for demonstration purposes....

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SKU: F23A
Castell
Castell #23A Light Red Planetary Filter 25% Transmission
 
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Planetary Colour Filter #23A Light Red 1.25-inch (25% transmission, M28.5x0.6) Spectrogram of transmission of some colour filters; only for demonstration purposes....

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SKU: F25
Castell
Castell #25 Red Planetary Filter 14% Transmission
 
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Planetary Colour Filter #25 Red 1.25-inch (14% transmission, M28.5x0.6) Spectrogram of transmission of some colour filters; only for demonstration purposes....

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SKU: F29
Castell
Castell #29 Dark Red Planetary Filter 4% Transmission
 
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Planetary Colour Filter #29 Dark Red 1.25-inch (4% transmission, M28.5x0.6). This very dark red filter is recommended for large telescopes from 150 - 200mm and up.

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SKU: F38A
Castell
Castell #38A Dark Blue Planetary Filter 13% Transmission
 
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Planetary Colour Filter #38A Dark Blue 1.25-inch (13% transmission, M28.5x0.6) Spectrogram of transmission of some colour filters; only for demonstration purposes....

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SKU: F47
Castell
Castell #47 Violet / Purple Planetary Filter 5% Transmission
 
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Planetary Colour Filter #47 Violet / Purple 1.25-inch (5% transmission, M28.5x0.6) Recommended for telescopes with aperture over appr. 150mm.This filter will improve observations of Venus by improving contrast of dark ...

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SKU: F56
Castell
Castell #56 Green Planetary Filter 24% Transmission
 
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Planetary Colour Filter #56 Green 1.25-inch (24% transmission, M28.5x0.6) Spectrogram of transmission of some colour filters; only for demonstration purposes....

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SKU: F58A
Castell
Castell #58A Dark Green Planetary Filter 14% Transmission
 
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Planetary Colour Filter #58A Dark Green 1.25-inch (14% transmission, M28.5x0.6) Spectrogram of transmission of some colour filters; only for demonstration purposes....

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SKU: F80A
Castell
Castell #80A Blue Planetary Filter 30% Transmission
 
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Planetary Colour Filter #80A Medium Blue 1.25-inch (30% transmission, M28.5x0.6) Spectrogram of transmission of some colour filters; only for demonstration purposes....

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SKU: F82A
Castell
Castell #82A Light Blue Planetary Filter 73% Transmission
 
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Planetary Colour Filter #82A Light Blue 1.25-inch (73% transmission, M28.5x0.6) Spectrogram of transmission of some colour filters; only for demonstration purposes....

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SKU: Z230-LRGB1.25
ZWOptical
ZWO CCD LRGB Filter-Set 1.25"
 
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SKU: Z231-LRGB1.25NEW
ZWOptical
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SKU: Z232-LRGB31
ZWOptical
ZWO CCD LRGB Filter-Set 31mm - Optimised for ZWO ASI1600 Cameras
 
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SKU: Z233-LRGB36
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SKU: 20202
SkyWatcher
SkyWatcher Lunar/Planetary Filter Set - 1.25-inch
 
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SkyWatcher 1.25" Lunar/Planetary Filter Set - 4 Filters The filter set comes in a foam lined plastic screw top storage case.er set includes 4x high quality glass colour filters; yellow, red, blue and neutral dens...

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Baader Planetarium
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SKU: F29
Castell
Castell #29 Dark Red Planetary Filter 4% Transmission
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Planetary Colour Filter #29 Dark Red 1.25-inch (4% transmission, M28.5x0.6). This very dark red filter is recommended for large telescopes from 150 - 200mm and up.

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