Baader Red 610nm Long-Pass Filter - Round Mounted - FCFR- Size:1.25" The Baader Planetarium Semi-APO Filter

The Baader Planetarium Semi-APO Filter works like it'''s name implies

Compression rings (both on diagonal and adapter) to prevent barrel marring

Perfect for carrying tripod for SkyTracker or SmartEQ

Maximum Magnification:  500

and half the cost

Baader Red 610nm Long-Pass Filter - Round Mounted - FCFR- Size:1.25" The Baader Planetarium Semi-APO FilterAbout the Baader Red 610nm 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 Red 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. Substrates