Contact Us
Menu
Your Cart

COVID-19 and STOCK Availability Info | All account holders will need to reset their password in our new system. Thanks for your co-operation!

Castell

Castell #11 Yellow/Green Planetary Filter 78% Transmission -  1.25" Castell #11 Yellow/Green Planetary Filter 78% Transmission -  1.25"
Ask About Stock
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
Brand: Castell
Castell CLS Filter for eyepieces, cameras and filter wheels with 1.25-Inch (31.7 mm) nosepieceThe Castell CLS filter blocks the part of the spectrum where street lights (sodium, mercury lamps) emit light. This filter comes in an extremely low profile cell with just 4.5mm thickness (or if we also c..
£43.00
Ex Tax:£35.83
Brand: Castell
Castell CLS Filter for eyepieces, cameras and filter wheels with 2-Inch (50.8 mm) nosepieceThe Castell CLS filter blocks the part of the spectrum where street lights (sodium, mercury lamps) emit light. This filter comes in an extremely low profile cell with just 4.5mm thickness (or if we also calc..
£74.00
Ex Tax:£61.67
Castell OIII Deepsky Filter for 2-Inch Eyepieces Castell OIII Deepsky Filter for 2-Inch Eyepieces
Ask About Stock
Brand: Castell
Castell OIII Deepsky Filter for 2" 2-Inch (31.7 mm) Eyepieces This OIII filter will allow emission lines of the doubly ionised oxygen (OIII)  where most of the light comes from older objects such as planetary nebulae and supernova remnants. Similarly to the UHC filter, it will also cut off..
£59.60
Ex Tax:£49.67
Brand: Castell
Castell UHC Deepsky Filter for 2-Inch (50.8 mm) EyepiecesThis UHC filter allows emission lines of H-alpha, H-beta, S-II and O-III where most of the light comes from in the case of emission nebulae. On the contrary it will cut off all the light produced by Mercury and Sodium lamps that is important..
£61.80
Ex Tax:£51.50
Brand: Castell
Castell UHC Deepsky Filter for 1.25-Inch (31.7 mm) EyepiecesThis UHC filter allows emission lines of H-alpha, H-beta, S-II and O-III where most of the light comes from in the case of emission nebulae. On the contrary it will cut off all the light produced by Mercury and Sodium lamps that is import..
£38.00
Ex Tax:£31.67
Showing 1 to 17 of 17 (1 Pages)