Are you sure these aren't blue stars with the center pixels saturated? Is the same thing observed on fainter stars?
They seem to be blue stars, but in general the blue channel stars appear to be significantly larger than in the other channels, not just for brighter stars:
The above is from a 12x300" stack.
So in this I do see some stars that do not bloat in the blue channel. I guess my question is, should I expect my blue channel to be bloated compared to the others like what is shown? Would an L2 or L3 filter actually help with this? The ASI2600 manual shows that the window has the following bandpass which looks like an L2 filter.
Edited by Poynting, 08 April 2021 - 08:45 PM.