Baader Semi Apo Filter 1.25" This curvature causes stars that

This curvature causes stars that are imaged at the edge of the field of view to be less sharp

Ideal for both visual observation and astrophotography

Fits into the filter thread of almost all 1

25" size focuser - compatible with almost all standard accessories

Zoom function  - Image stabilizer  - Compass  - Rangefinder  - Splash-proof  yes Protection bag - Threaded tripod connector  yes Eyepieces for spectacle wearers  yes Watertight  yes

Baader Semi Apo Filter 1.25" This curvature causes stars thatDescription A filter that removes the need to combine the Neodymium Moon and Skyglow filter with the Fringe Killers to deliver an amazing colour corrected image to achromatic refractors. The Baader Semi Apo does it all in one filter. Baader Semi Apo Filter against violet fringes of refractors 1. 25" cell By selectively filtering out of those parts of the spectrum where the false colour of achromatic refractors is significant, this disturbing effect is