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I dont use the UHC as much as I thought I would.
Where its good is for teasing more detail and contrast out of nebulae by darkening the background. The best object to try one on is the Tarantula neb in the LMC. It show sooooo much more nebulosity and whispy detail.
As using the filter also makes the wanted object dimmer, it works best from a dark site. The less ambient light the more useful it appears to be.
Mine is a Lumicon and I find that stars dont focus as sharply when using it, and brighter stars have coloured fringing.
I have heard that the Astronomiks brand is a lot better in this respect and worth the extra money.
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