Unmatched 98% Average Transmission!? Freedom from ghost images (very low reflection multi-coating, Striae-free, and plane-parallel substrate).
Extremely Sharp Cutoff at 680nm? (leaves all the visible red, including the important 656nm H-alpha emission line).
Sharp cutoff below 420nm.? Eliminates violet halos around bright stars (more effectively than simpler so-called Minus Violet photographic filters).
True optical quality glass substrate and coatings.?Why spend all your money on quality primary optics - only to place a lower grade filter optic in the path
Combine with any of the other Baader filters, to deliver the sharpest images possible.

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 3 inch
Height : 0.7 inch
Length : 3 inch

Item Weight: 2.08 ounce (View shipping rates and policies)
Shipping Weight: 2.4 ounce (View shipping rates and policies)

ASIN : B00OXKGAN4