Hi Brendan,
Tricky question. Some people will pay a lot for minor changes. I guess if you spend a lot of time observing from the back yard then it may be worth it. For me for visual the semiapo is a must and, as mentioned, I never remove the filter from the star diagonal. If you spend a lot of time looking at planets it might also be quite nice to have something like a moon and skyglow. I can really notice a difference in sky brightness without the semi-apo in place so it is noticeable although subtle. Best thing is to check out some filters at a star party. I havent tried the other LPR filters.
My UHCS is mainly for photographic. Its great for that and can double as an Ha filter if you combine it with a red filter (which is a bonus- so its a 2 in 1 filter in a way). If I was using it just for visual it would take a bit more convincing for me to buy this for the price.
Cheers
David
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