I have used the CLS Optolong filter for a D7000 and sent it back soon after.
It doesn't fit properly (at least the sample I had didn't) and it ended up getting damaged. At one point, I couldn't get the lens off the body, as the filter had become wedged.
This was almost a year ago I think and they may have changed the design since, but I'd be cautious.
Good luck
Bob
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