Astro-Tech Focuser collimating ring for 6" and 8" Astro-Tech Ritchey-Chrétiens

Availability: More on the way

This Astro-Tech FCR68 focuser collimation ring lets you fine-tune the focuser collimation of 6" and 8" Astro-Tech Ritchey-Chrétien astrographs to improve the sharpness at the corners of images taken with large 35mm-class DSLR and CCD sensors.