I am very pleased with the cheaper GSO coma corrector and how easy it was to find the correct back focus with both my astrophotography cameras. I have noticed with large chip cameras like the IMX571 I still have coma in the outer edges of the image while this does not happen with smaller chips like the IMX585, indicating that collimation is reasonably good and the coma corrector is doing a excellent job. Maybe I need to purchase a field flattener next to correct the issue or just get better at collimating my GSO 6" F5 reflector telescope.

I have several scopes, flatteners and reducers from this brand and the quality has all ways been high so seemed like a no brainer to try their coma corrector.

Blown away with the effect this coma corrector has on my favourite Maxvision 24mm 82degree eyepiece through my 12” f/4.9 dob; it simply cleans up the coma and tightens up the stars perfectly; I used 1 x 12mm & 1 x 7mm extension ring making 19 total, I can't see myself using the Morpheus 17.5 without it, as switched from the 24mm Maxvision back to the Morpheus 17.5 and found it to need that last 5% improved. After my focuser upgrade, this is the best addition to my Dobsonian; very impressed.