GSO photographic coma corrector for Newtonian telescopes. 1.25" corrector, designed specifically for the GSO 4.5" F/4 M-CRF-D Reflector Carbon (SKU: GS280) and other telescopes with a 1.25" focuser, for which two-inch correctors cannot be used.

For focusers with a smaller shift range, in telescopes with a shorter working distance, it is recommended to use a 1.25" 25 mm extension with a double-sided M28.5x0.6 thread (GSO FF519) in order to seat the corrector deeper in the focuser (it allows you to shorten the back focus from 72 mm to 47 mm).

Technical parameters

• Diameter: 1.25" / 31.7 mm
• working distance / back focus: 72 mm, counted from the beginning of the external thread
• camera side mount: external thread (male) M28.5x0.6 (1.25" filter thread)
• total length: 56 mm
• weight: 81.6 g