Hi,


I wish to take good photo in environment with low ambient light (dinner in hotel ballroom, for instance). I read somewhere that I should use f8 and fast enough shutter speed like 1/60 to take good photo with no motion blur of subject and good depth of field for the surrounding objects.


However, my lens can only do f5.6 most of the time when I zoomed in. Because of this f5.6 and the fast shutter speed I used, the photos I taken recently are all with dark ambient light which do not look professional. Should I get a lens that can do f2.8 instead?


I have a 580EX II, can I rely on this external flash to do magic and avoid spending money to get a new f2.8 lens?


Is setting 580 EX II to do 2nd curtain sync able improve the ambient light problem in my case?