Many

My OTA is a 150mm f4, I tested today and result was very good, the corrector is doing it job. I didn't had any artifacts and the small coma is really small. I am very intriguing is this star with blue halo happened to other people and if is consistent with a reflection or something else, for me as a reflection is a bit difficult because was 40 pics, one minute each and of course the ota change position and the reflection will move on the frame, what do you think.

Great picture, amazing. Tonight is going to be clear sky. I will do more test. Regarding the ghost star with blue halo, is just a reflection? Or a parasite light getting in the tube. Cheers.

Hi, thanks for your advice, that is true, some difficult finding the correct distance, but I think I go it finally. Still confused me that at 5 cm from the sensor produced this funny fake star and at 7cm it is gone. Just to add, the first time that I used the GSO, I do with the 5mm ring that coming with the GSO, same exposure, same target, lot of coma, but not this fake star. You mentioned another coma corrector, but when I trying to search for it, skywatcher coma is the result, is that one you suggest? Cheers from Bonaire

Hi everyone, I just get a Newtonian 150mm F4, also come with a GSO coma corrector, in my first setup I didn't get the correction that I was looking for (issue at the corners of the pics), later I change the configuration (distance of the corrector to the camera) and the problem was fix in a 95%, very happy. So yesterday in my last test I do subs of 60 sec of Zosma (star in leo, SAO81727) All good and a lot of coma in my photos, later I made some changes in the optic train, put the coma closer to the the sensor and finally round stars. The first set of photos shows something like a star with a blue halo, and my last photo when finally my problem was solved, the object disappear, The question is if this can be an artifact product of the coma corrector? The artifact photo and the no artifact photo is a 2 minutes difference in time. Thanks for your inputs. Attach two photos

I have a old Newton, 8" with out secondary .

Hi, did you finished your project?