Home :: OPTICAL ACCESSORIES :: Filters :: Other Contrast & Deepsky Filters :: Castell OIII Deepsky Filter for 2-Inch Eyepieces

Castell OIII Deepsky Filter for 2-Inch Eyepieces

Manufacturers View products from this brand

out Ask about stock
0.25 kg
Our price:
including VAT 20.00 % ( £9.93 )

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 all the light produced by Mercury and Sodium lamps that is important for astronomers in light polluted areas. The result is an astounding visual observation experience: brightness of stars decreased by 2-3 magnitudes, whilst the darker background emphecises the contrast of our main astronomical objects such as nebulae. Details of deep sky objects will plastically stand out from the background, thus producing a photo-like sight of nebulae through larger telescopes (e.g. NGC 6992-6995, Veil Nebula in Cygnus).


This new version comes now in a plastic case.


One of our customers wrote about this filter on Stargazerslounge. Click here!

: *
: *
: *
Baader Hyperion Zoom T-Ring SP54/T-2
Baader H-beta CCD Line-Filter 8.5nm 1'/4" (optically polished)
Celestron HD Pro Wedge, Heavy Duty
Rigel RS-Spectroscope
ZWO ASI294MC Colour 4/3" CMOS USB3.0 Deep Sky Imager Camera
There have been no reviews

Only those who bought this product are allowed to add review
If you've already bought this product, please sign in and add your own review!
The website uses cookies to allow us to better understand how the site is used. By continuing to use this site, you consent to this policy. Click to learn more.