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Both my filters are Bintel branded ones which I think are made by GSO. I use both, but the OIII is really only for PNs, the UHC works on more nebula and can improve PNs. I would probably suggest go with a UHC first as it useable on more objects.
As for the TV plossl, cannot say as haven't used one, but from reports are certainly better than stock standard plossls. However I wouldn't get it unless you have a need for the particular focal length. What EPs do you have now?
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