Quote Originally Posted by annelouise
Thank you! to my 2 responses. I have followed your leads, and I have worked out I need to slow the shutter speed by 2 stops from 1/10 speed. The only thing which confuses me is that shutter speeds go in 1/15, 1/8 and 1/4 (halving as they go) So theoretically 1/10 leads me to 1/2.5 ... is that correct??

I should add, I'm not allowed to look at a camera to do this (this is cheating!) my exercise is to find the answer only using websites & forums!
That is correct. The camera will probably show that as 0.4" - TF