Baader Orange 570nm Long-Pass Filter - Round Mounted - FCFO- 2"/1.25" Eyepieces Focal Length: 17

Focal Length: 17

For the first time

Eliminates the color error present in economy refractors

The front "crown" incorporates milled notches

Baader Orange 570nm Long-Pass Filter - Round Mounted - FCFO- 2"/1.25" Eyepieces Focal Length: 17About the Baader Orange 570nm Long Pass Filter Round Mounted Baader Planetarium astronomy filters by far supersede the mediocre quality of common "flame polished" color filters. A fine optical polish and 2 mm thick glass allows the Baader Orange Filter to be inserted anywhere into the optical path without introducing astigmatism or other defects. For instance, they can be used in front of a binocular viewer without degrading the image in any way.