Bioshock- Photographing turrets and cameras

Did i miss my chance at getting the trophy for maxing out all research? I didn't realize I had to get turrets and cameras and as it turns out, every single camera is either destroyed or friendly. Turretts as well so I'm not sure what to do with that. When I start a new game can I max those two out and still get the trophies? =\

Ok well luckily i found two turrets in a room to take a picture of. impossible to max out with two turretts, so i'll lose out on one trophy, the one that maxes out all research. but as far as take a picture as one in every group, I got that. Just wish I knew i needed them before hand. Just didn't want to ruin the game and look at the trophy list too much in the beginning.

You could reload from a save that's before you go on the elevator to the final boss. You can back track to a bathysphere to go anywhere you want in Rapture.anime_gamer007

But as for cameras how does backtracking help you when they are all friendly or destroyed?