Sky-Watcher Quattro Coma Corrector

Fast Newtonian telescopes naturally suffer from coma, an optical aberration that makes stars at the edges of your frame look like little comets or teardrops. This corrector fixes that distortion, ensuring your stars remain sharp, round, and pinpoint-accurate from the center all the way to the corners of your sensor.

This unit is specifically optimized for the Sky-Watcher Quattro f/4 imaging Newtonian series. While it may provide some correction on other f/4 Newtonians, we recommend sticking to the Quattro line to guarantee the optical performance and back focus requirements are met.

It is essential. The 55 mm back focus is the precise distance required between the corrector and your camera sensor for the optics to function correctly. If you are off by even a few millimeters, you will likely see residual distortion in the corners of your images.

Yes, the unit is threaded to accept standard 2-inch filters. This makes it easy to integrate into your existing imaging train without needing additional adapters.

No, this is a dedicated coma corrector, not a focal reducer or Barlow lens. It is designed to correct aberrations without changing the focal length or focal ratio of your telescope.