Celestron Ha-Hb-OIII Imaging Filter - Rowe-Ackermann 8 Astrograph - 93619 Binocular Viewers and align to your telescope''s

and align to your telescope''s optics with the azimuth and altitude adjustment knobs

Use the lighter filters with smaller telescopes and higher magnification eyepieces

diffraction-limited optical systems are multi-coated to maximize contrast and image sharpness

This extension allows you to raise the elevation of your mount by 6

Secondary Mirror Obstruction: 3

Celestron Ha-Hb-OIII Imaging Filter - Rowe-Ackermann 8 Astrograph - 93619 Binocular Viewers and align to your telescope''sCelestron Ha Hb OIII Imaging Filter Rowe Ackermann 8 Astrograph This is a Celestron Ha Hb OIII Imaging Filter for the Rowe Ackermann 8 (RASA) Astrograph Enhance imaging of nebulae with your 8 Rowe Ackermann Schmidt Astrograph by blocking light pollution, improving image contrast, and darkening the sky background This filter transmits only the key H H OIII wavelengths from emission nebulae, providing high contrast that yields better images This filter