"Cernan: I left my Hasselblad camera there with the lens pointing up at the zenith, the idea being someday someone would come back and find out how much deterioration solar cosmic radiation had on the glass.
So, going up the ladder, I never took a photo of my last footstep. How dumb! Wouldn’t it have been better to take the camera with me, get the shot, take the film pack off and then (for weight restrictions) throw the camera away?"
Last Man on Moon Left Camera Behind, Regrets NASA’s Fade - Bloomberg Business
Seems they were pretty concerned with weight.