Ultima Series spotters perform extremely well under all light conditions which makes them ideal for all types of outdoor viewing
...
The Celestron UHC/LPR Filter
- 1.25" Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light. This
Includes:: mercury vapor, & both high & low pressure sodium vapor lights & the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow).
This new ultra high contrast (UHC) LPR filter has enhanced contrast over the typical broadband filters. Sky background is darker, & contrast of emission nebulae are noticeably enhanced. The advanced technology coatings enable the filter to achieve an outstanding transmission of over 97% across the entire bandpass, with total blockage of prominent light pollution lines. This is the perfect filter for viewing nebula from light polluted skies, or for boosting the contrast of nebula from dark sky sites.
Features
- The multi-layer dielectric coatings are plasma assisted & Ionbeam hardened using the latest technology for durability & resistance to scratching.
- enhanced transmission translates to maximum image brightness & contrast. Users of smaller, 4"-11" telescopes will especially appreciate the high efficiency, & larger scope users will love the rich star fields & detailed subtle nebular shadings that are left intact.
- The high transmission, sharp cutoffs, & more moderate 60nm passband of the UHC/LPR filter retains a more natural view, yet significantly boosts overall contrast. Imagers will appreciate the broader bandpass & inclusion of an extremely efficient H-Alpha passband (656nm).