Hi mate,

I use the B+W 10 stop ND filter on my 5D2. You will struggle to meter accurately and will definitely not be able to use autofocus. BUT - you get 30s + exposures in bright daylight so it's a tradeoff I'm willing to make. You'll get a warmer colour temperature as well but if you shoot in RAW then it's easy to fix in post. Here's a couple of examples for you:


Downstream East Leichardt by Ben__Taylor, on Flickr


Simpson Desert Series # 2 by Ben__Taylor, on Flickr



Cheers,

Ben