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I use a Hoya ND400, declared as 9 stop ND, but it performs as a 10 stop ND in my experience. It was a bit of a pain using it at first, but I got used to the process and I love the results
On the other hand, I am not sure how a strong ND slide-in filter would work - I have made 3 or 4 test shots with a Cokin IR filter and my Canon 20D. That called for exposures longer than 20 secs, so it can be compared to this, I guess. I had problems with light leeks. It was hard for me to block all of the openings in the cokin P filter holder system, and the shots were ruined. I was discouraged by those first attempts and never tried again - I returned to using screw-in filters for IR photography. Talking to some other photographers, it turns out they had similar experiences. But if you have a holder with a tighter fit, why not try?
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