I've decided to see how I get along with these before getting any deeper into B&W contrast filters. Based on internet examples and playing around in Capture One, I'm doubtful that I'd use a red #25, and I suspect that I might find orange #16 more useful than orange #22. I'm also wary of the exposure handicap with the stronger filters. Although makers have cut back on what they offer (for example, B+W no longer makes most of the B&W contrast filters shown in a B+W brochure that I have), it looks like these filters are easy to find second-hand at attractive prices. The market/demand for them is probably too small to make them worth counterfeiting.
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