Hello. I am using a light box to photograph some jewellery. I was getting a grey background so I increased the EV to the recommended 1.7 ( this is what it suggests on the light box) but it is still dark and murky. I have tried increasing to 2.0 but it just over exposes the whole photo. I am using the 'P' function on a D50 as I am not very good with the manual function. Does anyone out there know the best settings to use for this type of photography? And how I can achieve a crisp white background? Thanks in advance!