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Not at $500 for me tho.... I'll just stack my existing 10 stop with a 3 Stop and a CPL

http://www.singh-ray.com/mor-slo15.html

500 bucks, stuff that.. i'll just add a IRND filter (for alot less) and use it with either the lee or B+W fat stoppers

really at the end of the day 10 stops is pretty well all I have ever needed, i have never thought, 'damn i wish I had 5 more stops to get me another xx seconds'.. also when pushing those long exposures, hot pixels become a pretty big factor for me.

Hot pixels? What about time hanging around falling in puddles? No tanks...