For the records, I am planning to spend a longer time in May 2021 to work on the issues of the Veloce.
First, to sort out halos and odd arcs found in the images osmetimes we will:
- Test the system without filters
- Swap a few filters with newer Astrodons and Baaders (not all; but definitively O3)
- Remove the S2 filter (as it is the least used one) and insert instead a "black" filter to be finally able to create darks and flats anytime we want
- Look for any surface in the lightpath that could cause reflections, and darken it (will carry velours tape and paint with me). I strongly suspect the dew shield to be the culprit. Let's see if we can do anything there
Then, of course, the almost mythical collimation / orthogonality of the Veloce will be the priority. I will have more time and support from OS (hopefully) this time to tackle it once and for all.