Quote:
Originally Posted by gregbradley
I finally got those 2 files - thanks for separating them.
I aligned them with various CCDstack and I see what you mean. The small stars are fairly static but the brighter ones are moving slightly.
I also did a star alignment in PixInsight and got the same result.
Odd. Is a lens loose in your lens cell or something? Odd its only on the brighter stars.
Greg.
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Thanks Greg, there is nothing loose are far as I can tell and it is only a relatively small aberration but still worth chasing down if it is possible to address. It is looking more to me like a combination of some small tilt and collimation issues. Now that I have CCD Inspector I can do some more objective tests to see.
And on that note, I would like to ask a specific question. When I run CCDI it shows a tilt of 9% - 10% and a collimation error of around 4". Are these sorts of figures indicative of underlying problems that need to be chased down or are they small enough that you wouldn't normally bother? Is there a benchmark for this sort of testing? Sorry for asking basic questions but I am not that familiar with using CCDI.