This is a 1.25" filter. Surface never touched.
$75, shipped in CONUS. PayPal only.
The original Lumicon Ultra-High-Contrast narrow bandpass filter creates extreme contrast between the black background of space and the delicate photons of nebula light needed for near-photographic views of the Orion, Lagoon, Swan and planetary nebulae, among others. This makes the Lumicon UHC Filter the best all-around dark-sky filter on the market today.
Thanks for looking!