Baader Semi APO Filter 20244 allowing you to change eyepieces

allowing you to change eyepieces without requiring you to remove and re-attach the filter from each eyepiece barrel

25” adapter is included

Ready to use out of the box

25 SCT Goto

the price therefore initially may appear high for "nothing more than" a clamping device

Baader Semi APO Filter 20244 allowing you to change eyepiecesPlanoptically Polished with Phantom Coating Group (PCG). Baader's newest addition for Achromat owners. The Semi APO works like it's name implies delivering an amazingly neutral view, while cutting most of the annoying and contrast robbing violet fringe that plagues all achromats. The Semi APO filter combines a stronger Fringe Killer coating formula with the Moon & Skyglow Neodymium substrate. The result is similar performance to the Fringe Killer +