I highly recommend "Combat Photography" I've just touched on a few of the 390 pages, but so far It's been the best first hand account from people who used cameras in WWII.
"Observers also noted, though to a far lesser extent, what the Allies and the enemy were doing. "I noticed that the Russian photographers," said one report, "were each equipped with three Leicas in addition to their Speed Graphics. 'The Reds painted the top of each Leica a different color to indicate a different focal length and could begin shooting immediately without having to change lenses."
"In addition to the usual military equipment, each officer in Unit 1 carried a waterproof Eyemo case (too heavy for the Eyemo operators) a musette bag of film. One started out with a K-20 Air Force 4 x 5 camera, trigger operated and using a 50-exposure roll of film. Finding it too heavy, he gave it to the skipper of the LCI to return; "and it hasn't been recovered yet." A Sergeant:, and a Pfc. each had an Eyemo, and eleven 100-foot reels of film; one camera was a Model Q., the other a model K. Another Pfc. had a loaded Model Q and eight reels; a. third Pfc. had a 4 x 5 Speed Graphic, 24 packs of film, .and eleven Eyemo magazines. A Pvt. carried his own Super Ikonta B (with which he took the best stills of the campaign), 18 rolls of film for it, and about 10 EyeMo magazines. The landing began at 0745, in rough water from waist to shoulder deep. One musette bag was submerged, and water got into cans containing 600 feet of exposed film. The water was dumped out, the cans reclosed, ad the film was later reprocessed satisfactorily.
"Rubber jungle issue food bags were used to protect Rolleiflexes, Ikontas and Leicas from dust and moisture. Jungle issue clothing bags, made for use as a waterproof lining for jungle packs, were similarly employed to protect such larger cameras as t he Speed Graphic and Eyemo."
"Light was good at the landing; motion pictures were taken at f/ll and f/9, stills at 1/100 second, f/ll. Later, in the jungle, lenses were opened to full aperture. It was also found futile to attempt to make still pictures with exposures slower than 1/25 second unless a camera support was used, or unless the cameraman was in the prone, kneeling or sitting positions of' the rifleman"