Celestron's 2" 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, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow).
The new ultra high contrast (UHC) LPR filter has improved contrast over the typical broadband filters. Sky background is darker, and contrast of emission nebulae are noticeably improved. 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. The perfect filter for viewing nebula from light polluted skies, or for boosting the contrast of nebula from dark sky sites.
In addition to it's optimum spectral and optical characteristics, the UHC/LPR filter offers important features that set it apart and result in the highest quality celestial views:
The multi-layer dielectric coatings are plasma assisted and Ionbeam hardened using the latest technology for durability and resistance to scratching.
Improved transmission translates to maximum image brightness and contrast. Users of smaller, 4"-11" telescopes will especially appreciate the high efficiency, and larger scope users will love the rich star fields and detailed subtle nebular shadings that are left intact.
The high transmission, sharp cutoffs, and 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 and inclusion of an extremely efficient H-Alpha passband (656nm).
Product carries full two year factory limited warranty (within US/Canada only).
Sep 27, 2013
Quality Lenses,Strong ConstructionCons: Comments:
This filter is an excellent performer for its intended use! The overall quality is great with excellent $ value as usual from this dealer!
This review was provided courtesy of AgenaAstro.comMar 22, 2013
Celestron LPR filterPros:
Lightweight,Easy to Use,Quality Lenses,Strong ConstructionCons: Comments:
It is in the broad-band "LPR" filter classification.
While these filters do not eliminate the effects of light pollution, in many cases, these filters can improve the visibility of some deep-sky objects to at least some degree. It won't help nearly as much as the narrower filters do.
This review was provided courtesy of AgenaAstro.com
nam2525 New Member
- Skill Level
- Time with Product
May 3, 2007
- User Notes:
Great for AstrophotographyPros:
Well Made, Great performance for astro photosCons:
Hard to find, Might vignetteComments:
There are many reviews of similar Light Pollution Reduction filters on the web. That's a good thing because I don't think these are available anymore. I have not compared this with other filter brands, but from what I have learned Celestron has a reputation for quality coatings in their filters. There are some other brands that might have a better coating process or better coatings altogether, but for my needs with astrophotography (not really visual use), I have been very satisfied with the Celestron LPR.
Note that this is not the UHC/LPR...I wanted just the LPR filter so I could get more of the natural wavelengths of light....and I was not concerned about getting higher contrast with the UHC version because a long exposure with the camera will bring out everything that is there. Visual users might be better off with a UHC version, but do some investigating to find out what will suit your needs. There are reviews that tell which types of filters work best for different objects.
At my imaging location in a small city, I have 2 orange colored street lamps 50 feet away from where I set up my scope for imaging.
Without the filter, the sky background gets saturated really fast. An exposure at ISO 1600 will white-out in a matter of maybe 3 minutes (rough estimate). But with the LPR filter, I have taken images lasting up to 30 minutes with virtually no effect from light pollution at all! There is a 2-inch version that more than likely won't vignette images....this 1-1/4 version might depending on how your imaging train is set up. I have used it on an F/8 scope with an imaging train like this: scope, LPR on nose of Meade 644 flip mirror, short T-thread adapter, Canon 350D body. I never really noticed vignetting with this set up.
To sum up, This is a great choice for astrophotography in a light polluted area, if you can find one....or just get another brand of LPR. Most brands should work well for astrophotography.Sort by