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Yeah mate, I was going to add I don't think it's as simple as adding a red visual filter. I'm of course using the R filter out of my Astronomik filter set. I don't reckon you can buy these separately though.
I've found just the standard IR/UV cut is pretty good & I'm assuming you have one of them? Now what IS as good as an R filter is the one I made from a piece of exposed film some years ago.
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