I bought their X2 6 stop ND filter. They also have X4 6 stop ND filter. X2 seems good. Difference in X2 vs. X4 seems to be the 2 has Japanese glass and the 4 has German glass and brass instead of metal ring; it costs 2 or 3x as much. I asked for comparison shots with each which they do to other competition, but they won't provide, I assume because there really isn't much if any difference. Do any of you have experience with, or input on, both? Thanks!
Is the 4x filter available separately now? The last time I looked it was only offered as part of a Kickstarter package with a new UV filter.
These guys are filter fanatics. The price is high, but so is the quality. Their CPL is the best I have ever used.
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