Baader F/2 Highspeed Filter H-Alpha Size::31mm Secondary Mirror Obstruction by Diameter:

Secondary Mirror Obstruction by Diameter: 36%

Our various ClickLock clamps are made of seven precision-machined components which provide a highly effective retention mechanism that securely holds any 1¼" or 2" eyepiece

Was there anything before the Big Bang

The new Mark III however works exceptionally well even down to f3

Baader F/2 Highspeed Filter H-Alpha Size::31mm Secondary Mirror Obstruction by Diameter:Baader F 2 Highspeed Filter H Alpha CCD imagers will find that Baader's new Narrowband 7nm H Alpha pass filter delivers the absolute highest contrast deep sky images of H II regions, all with the shortest exposures possible. Its narrow 7nm FWHM bandwidth has a transmission at H Alpha of over 90%, while completely rejecting light pollution. The high optical quality of the Baader 7nm H Alpha filter guarantees no loss in sharpness or contrast. Each