The night sessions are usually pretty worth while.
I would suggest checking out court one as well as center - last year at least court one had the best match at night - Costa and Henman, whereas center court was a one sided Arazi - Hewitt match.
Anyhow you can use the camera if the flash is off. If it isn't they will take it from you.
I'm going wednesday and thursday for second and third round , and can hardly wait