Thanks Garry ill try tonite with the manual dark subtraction and experiment , is it best when doing this to turn off the NR altogether or let it run and combine with a dark frame. Paul light conditons are somewhat poor ,typical urban conditons although i concentrated in a northerly direction where its better . For wide feild shots is there any advantage to take a series of sub 1 min shots and layer them in PS ,is it worth it.
Cheers