The “LPR filters (Light Pollution Reduction) reduce selectively
certain wavelengths of light (light pollution).
Ultra High Contrast LPR (UHC) filter improves contrast. Of the
Sky background is darker and the contrast is the emission nebula
noticeably improved.
The perfect filter for viewing nebulae from light polluted ones
skies or to increase the contrast of nebulae from locations with
dark sky.