Baader Premium Six-Piece Color Filter Set - 2" Round Mounted - FCFS-2About the Baader Premium Six Piece Color Filter Set 2" Round Mounted The Baader Premium Six Piece Color Filter Set includes three bandpass filters (Green, Bright Blue, Dark Blue) and three long pass filters (Red, Orange, Yellow) and is designed for 1. 25" eyepieces. A fine optical polish and 2 mm thick glass allows these filters to be inserted anywhere into the optical path without introducing astigmatism or other defects. For instance, they can be