I shoot with a d100 and I have been having trouble with noise in my pictures. The lens that is causing the problem is a 35-70mm 3.3-4.5 lens... not the best and it's been around for a bit, however it takes great pics sometimes and then other times there is a lot of noise.
For example, I set up my lights and did some pics of Emilie one night and then the next night I set my lights up again, in the same set-up (eh, close enough) and did some pics of a couple and their baby. The shots of the couple came out rather noisy compared to Emilie's. Emilie's were perfectly clear and the couple's noisy.
Has anyone else had a problem with this?
And does anyone know what is causing this?
Thanks for your time and help.