Fantastic, thanks heaps for the advice guys. Might get the single coated

To be honest I wanted a variable that went up to 10 stops but finding one is difficult to say the least. I had a Rodenstock, which was fantastic quality, but it only had 5 stops. 30 second exposures in daylight is what I'm after as I found with the Rodenstock I had to wait til very late afternoon before I could use it effectively.