
Also I find it's worth having a set of these to hand:
www.cokin.co.uk/pages/grad1.htm
( , Mon 18 May 2015, 21:04, Reply)

Have some flat ND filters but not graduated. I've also dabbled in mucking about with a single shot to improve the range but so far haven't managed to get it to look decent enough.
( , Tue 19 May 2015, 9:21, Reply)