Astronomik UHC Filter for 2'' The Astronomik UHC filter is one of the best we know for visual observing. It reliable blocks the artifical light of our towns but the important wavelengths O-III and H-Beta passes nearly to 100%. Additional you will have an important window at H-Alpha. Many nebulas shines in H-Alpha.
Which objects can be observed:The filter allows the contrasty observing of gas nebulas and planetary nebulas with very high contrast.
With which telescopes the filter can be used:Thanks of the high transmission also smaller telescopes from 80mm onwards can be used. The filter is optimized for focal ratios between 1:4 and 1:20.
Delivery contains: Products specifications
| Accessory | Filterbox |
| Connectingthread | M 48 both sides |
| Diameter | 2" |
| Type of filter | UHC Filter |
| Transmission | OIII and H-Betta near 100 % , H-Alpha 96 % |
| Made for | Visual Observing with Telescopes from 80 mm onwards |
