Thanks Andy,
I am planning to buy the B&W Filter, i have a 52mm +10 stop B&W filter but i need one for my 67mm lens, i was just wondering what the differences were.
I have ordered a 67 to 52 step down ring but im still waiting for it to arrive.
Not sure if it will do the job on my 67mm, if not ill get the 67mm filter
Archie