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Color Filters

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. 




Brand: 365ASTRONOMY
The 365Astronomy 2" to 1.25" Filter Adapter lets you use 1.25" filter with 2" accessories.The 365Astronomy 2" to 1.25" Filter Adapter lets you use 1.25" filter with 2" accessories.It converts a 2" filter holder into a 1.25" filter holder. 2" filters are only called 2" filters, because their outer ..
£12.80
Ex Tax:£10.67
Brand: 365ASTRONOMY
 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 glass Filters included: #12 - yellow #25 - dark red #56 - green ND96-0...
£22.99 £29.40
Ex Tax:£19.16
Brand: 365ASTRONOMY
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 glass Filters included: #8 - yellow (greenish yellow) #47 - dark blue #82A..
£22.99 £29.40
Ex Tax:£19.16
Brand: 365ASTRONOMY
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.It seems that this set is our bestseller... this combination of colours is the most popular...Size: 1.25" Material: optical quality glass Fi..
£22.99 £29.40
Ex Tax:£19.16
2" Blue Eyepiece filter 470nm Bandpass (optically polished) Baa-40-2458313 If you see that stock=0, don't worry, we may get it for you in most cases quickly. Please tell us what you are after, and we'll check with the manufacturer. Click here to CONTACT US ! Never use any eyepiece filter..
£52.00 £59.00
Ex Tax:£43.33
2" Dark Blue Eyepiece filter 435nm Bandpass (optically polished) Baa-40-2458312 If you see that stock=0, don't worry, we may get it for you in most cases quickly. Please tell us what you are after, and we'll check with the manufacturer. Click here to CONTACT US ! Never use any eyepiece f..
£52.00 £59.00
Ex Tax:£43.33
2" Eyepiece filter set / 6 colors (optically polished) PCG Multi-coatingBaa-40-2458310Never use any eyepiece filter for solar observation without objective front filter!..
£282.00 £319.00
Ex Tax:£235.00
2" Green Eyepiece filter 500nm Bandpass (optically polished)Baa-40-2458314Never use any eyepiece filter for solar observation without objective front filter!..
£52.00 £59.00
Ex Tax:£43.33
2" Orange Eyepiece filter 570nm Longpass (optically polished)Never use any eyepiece filter for solar observation without objective front filter!..
£52.00 £59.00
Ex Tax:£43.33
2" Red Eyepiece filter 610nm Longpass (optically polished)Never use any eyepiece filter for solar observation without objective front filter!..
£52.00 £59.00
Ex Tax:£43.33
Baader 2" Yellow Eyepiece filter 495nm Longpass
-12 % Ask About Stock
2" Yellow Eyepiece filter 495nm Longpass (optically polished)Never use any eyepiece filter for solar observation without objective front filter!..
£52.00 £59.00
Ex Tax:£43.33
Eyepiece filter set 1 1/4" 6 colors (optically polished) PCG Multi-coatingNever use any eyepiece filter for solar observation without objective front filter! Baa-40-2458300..
£189.00 £215.00
Ex Tax:£157.50
Castell #11 Yellow/Green Planetary Filter 78% Transmission -  1.25" Castell #11 Yellow/Green Planetary Filter 78% Transmission -  1.25"
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Brand: Castell
  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.    ..
£13.20
Ex Tax:£11.00
Brand: Castell
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.    ..
£13.20
Ex Tax:£11.00
Brand: Castell
Planetary Colour Filter #21 Orange 2-inch version (46% transmission, M28.5x0.6)Spectrogram of transmission of some colour filters; only for demonstration purposes.    ..
£19.90
Ex Tax:£16.58
Brand: Castell
Planetary Colour Filter #21 Orange 1.25-inch (46% transmission, M28.5x0.6)Spectrogram of transmission of some colour filters; only for demonstration purposes.    ..
£13.20
Ex Tax:£11.00
Brand: Castell
  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.    ..
£13.20
Ex Tax:£11.00
Brand: Castell
Planetary Colour Filter #25 Red 1.25-inch (14% transmission, M28.5x0.6)Spectrogram of transmission of some colour filters; only for demonstration purposes.  ..
£13.20
Ex Tax:£11.00
Brand: Castell
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.Spectrogram of transmission of some colour filters; only for demonstration purposes.  ..
£13.20
Ex Tax:£11.00
Brand: Castell
  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 clouds on Venus' atmosphere. It also highlights the structures in the rings..
£13.20
Ex Tax:£11.00
Brand: Castell
Planetary Colour Filter #56 Green 1.25-inch (24% transmission, M28.5x0.6)Spectrogram of transmission of some colour filters; only for demonstration purposes.    ..
£13.20
Ex Tax:£11.00
Brand: Castell
  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.    ..
£13.20
Ex Tax:£11.00
Brand: Castell
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.    ..
£13.20
Ex Tax:£11.00
Brand: Castell
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.    ..
£13.20
Ex Tax:£11.00
Green 1 1/4" Eyepiece filter 500nm Bandpass (optically polished) All substrates fineoptically polished. These filters by far supersede the mediocre quality of common „flame polished“ color filters.Fineoptical polish and 2 mm thickness allows these filters to be inserted anywhere into the optical pat..
£34.50 £39.00
Ex Tax:£28.75
Lunar/Planetary Filter Set - 1.25-inch from OVL
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1.25" Lunar/Planetary Filter Set - 4 Filters from OVL (Optical Vision Ltd, the official Skywatcher distributor in the UK and Western Europe).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 den..
£29.00
Ex Tax:£24.17
Orange 1 1/4" Eyepiece filter 570nm Longpass
-12 % Ask About Stock
Orange 1 1/4" Eyepiece filter 570nm Longpass (optically polished) Please CONTACT US for availability information!   Never use any eyepiece filter for solar observation without objective front filter!Baader Product Group: 40..
£34.50 £39.00
Ex Tax:£28.75
Brand: OPTOLONG
White Transparent Plastic Case for DEO-Tech OWL Spare M52 or M48 Filter HolderIt's a more or less transparent, white plastic case for one DEO-Tech OWL Spare M52 or M48 Filter Holder. Could aslo be used to hold a 2" filter.Comes with a pre-cut white foam for the shape of the DEO-Tech OWL filter h..
£4.20
Ex Tax:£3.50
Yellow 1 1/4" Eyepiece filter 495nm Longpass
-12 % Ask About Stock
Yellow 1 1/4" Eyepiece filter 495nm Longpass (optically polished)All substrates fineoptically polished. These filters by far supersede the mediocre quality of common „flame polished“ color filters.Fineoptical polish and 2 mm thickness allows these filters to be inserted anywhere into the optical..
£34.50 £39.00
Ex Tax:£28.75
Brand: ZWOptical
CCD LRGB Filter-Set 1.25" for beginner astro photographers (3 Color Filters + IR Cut Filter)Never use any eyepiece filter for solar observation without objective front filter!..
£79.00
Ex Tax:£65.83
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