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Question about Deep Sky or UHC filters
I have a number of Nebula filters. One is a Bintel Branded (GSO) UHC 1.25" filter, the other 2 are Lumicon Deep Sky 2" filters. I have 2 of the Lumicon ones as one came with the scope I just acquired so I am thinking of selling one.
One thing I have noticed is that I often see a little red spot next to stars in the field when I use these filters. Do any others see this also or is it a fault with the filters?
I had noticed it with the GSO one but sort of assumed as these are less expensive they may not be as good, but I have also noticed it with the Lumicons.
Malcolm
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