Thank you all for your generous replies, the advice has opened up my limited understanding.
So it would appear that a UHC filter would be the most useful for me at this stage.
The next 2 questions are
1. Should I be looking at getting a 2" or 1.25" filter?
My scope came with a 26mm 2" eyepiece which gives around 46x magnification.
The other 2 pieces are 1.25' (15mm and 9 mm). The 15mm ep gives 80x magnification.
And I guess the other issue is the width of field of view.
2. Which brand - it appears the costs are similar $250 for 2", $120 -$150 for the 1.25".
It appears the Astronomic is on a par with Lumicon ( but easier to get locally.)
There is another consideration is that I will most likely be upgrading eyepieces - as I become aware of the "need", and understand more - and intend to buy on quality rather than simply price.
The current scope I'll stay with until at least next year - mainly to try and max out its potential. Obviously any investments in eyepieces will be transferable to other scopes.
( Short term pain for long term gain - that's the line I'm rehearsing for swmbo.) Wife to Mark " You want to spend $250 on WHAT ????"
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