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Thanks Suzy. I was indeed lucky to catch it on Saturday night as it doesn't look like there will be clear sky anytime soon.
The UHC filter I think is just showing how much nebulosity is associated with the clusters. The designations that I track down for them (ie cluster vs cluster with nebulosity) I suspect are not all that definitive. It is interesting how much difference it can make even with a very distant OC.
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