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I am certainly interested to hear more about the Televue filter. From what I could glean of the Mars 'B' filter it is two filters combined into one. That is one side is coated orange akin to a 21 and the other side has some sort of LPR coating. I suppose you could achieve the same thing by stacking two such filters.
However, I too would be interested to hear if anyone can discern any differences between top brand and budget colour filters. I know you can see the differences in nebula filters but I wonder about colour filters?
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