Designed for today's large aperture mirrors and CCD imaging sensors, Tele Vue's 3" BIG Paracorr Type-2 Imaging Adapter corrects image-coma common with large fast focal ratio Newtonian and Dobsonian mirrors that prevent pin-point clarity during astrophotography and astro-imaging. The 3" barrel enables a larger field angle and reduces or eliminates vignetting when using CCD chips as large as 52mm diagonal.