let's see, first photo, blonde captain has a Pentax Spotmatic
second pic, guy on right has a Konica something in case.
third, Probably Yashica Electro rangefinder on left, and Captain Pentax from photo no. 1
fourth, On left, Nikkormat, center, Nikon in case, probably an F or maybe F2. Everything else was a Nikkormat until the FM or maybe the EL got called Nikon.
fifth and last photo, I don't recognize the tripod.
I'm going to guess later 60s or early 70s based mostly on the Spotmatic. Fun to see.