Hope you are doing well.
I have a f/5.5 refractor that shows spectacular chromatic aberration on bright objects like Venus (even with a Baader Contrast Booster Filter, that is described as a fringe killer). Would taking photos of such objects through RGB filters help, because I could then refocus for the blue?
If it would help, then do I need to buy expensive RGB filters or would the vastly cheaper generic ones do the job? I am wondering if the wider band pass of a cheaper blue filter would be narrow enough for my prismatic telescope not to split its components noticeably.
Prices do differ a bit, for example:
Astronomik Deep Sky RGB Filter Set is about 300 UKP, whereas a Pomya Eyepiece Lens Color Filter, 1.25" is about 10 UKP.
Well, perhaps not Pomya, as I have never heard of them, but I just wanted to show the extremes of the range (I know there's more expensive options than Astronomik but my photography skills aren't up to appreciating the advantages). For sure the 300+ filters give better results, and 13 UKP ones may be unusuable; however, for just combating CA, I wonder if 100s of pounds are necessary.
For my purposes Pomya might be fine, I don't know, and that's why I am asking those who do. I would only be using them for our moon, Venus, Jupiter, and Saturn, just the very bright objects.
We are entering difficult economic times, so now more than ever, it is wise to not spend more than is necessary to get the job done.
Thank you for any answers (even if just "Yes, No", which is my uninformed attempt at the answers).
Edited by Ivor Redtorch, 04 August 2020 - 05:46 AM.