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I purchased an Astronomik UHC-E filter some years ago to use on my f/5
10" dob and more than happy with it...By rights this type of filter is best suited for scope less than 6", however I find this a pearler when using it on most types of Nebulae...M42 stands out very bright and the details almost fit in a 32mm widefield eyepiece. Well worth the purchase.
Cheers!
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