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UHC filter
Hi David,
I would agree with the general purpose nebula / UHC style filter, they are a good all round filter and will not dim the image through a six inch as much as a OIII or H-beta as the UHC has a wider band pass that includes the OIII and the H-beta band lines. Some recommend an 8" minimum scope for the smaller bandpass O-III and H-beta filters.
We have seen the horse head through a 12" light bridge at a dark site, but it certainly didn't jump out at you.
Hope that helps.
Rob
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