Our
1-1/4" 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).
