David,
I’ve used the GY-HM700 in some extreme temperatures.
– In a Texas stone quarry in 100 degree heat and direct sun with a rain slick on to protect from dust. The camera was almost to hot to touch and it worked all day. The photographers still camera kept powering down due to the heat.
– I just filmed outdoors for over an hour in 19 degree cold and the camera worked great.
I haven’t yet worked in extreme humidity but I am taking it to SE Asia in a couple weeks, so I may have something to report on in March. The overall big difference is that the 700 is not tape based so there are no heads and tape mechanism to be effected by temperature and humidity. Overall, I would say it will perform much better than the 100 because it is shooting on cards instead of tape.
Thanks
Jon
Jon Leyse
Crash 31, LLC
http://www.crash31.com