The Explore Scientific 2" HR Variable Coma Corrector for Newtonians corrects the edge-of field aberrations common to the Newtonian and other telescope designs with parabolic reflecting mirrors.
Coma distortion is the major drawback of the Newtonian design and is especially pronounced with fast focal ratios. It causes objects at the outer edge of view to become distorted, and it can be frustrating to many astronomers.
Explore Scientific’s HR Variable Coma Corrector is a high-performance optical corrector designed by world famous optical designer Harrie Rutten, and it will help you minimize or even eliminate image aberrations caused by this off-axis optical phenomenon.
It is EMC Coated to reduce internal reflections, and its spacer with markings allows you to use the device on almost any Newtonian telescope with a parabolic primary mirror.
Tightly secured by three thumbscrews, this accessory comes with two adapters (.75” and 1”) to secure to your T adapter and a protective cap.