The OP hasn't specified why he wants the lightest camera. If I was more up for through-hiking, regardless of weight issues I would step down to MF, period, due simply to film handling. It is tempting to go for "the lightest possible" when contemplating / buying gear with the intention of going fairly far away from the car for photography. Of course issues with compatibility, flexibility, and of course most importantly personal preference will be better gauges of what camera one should get.
The good thing about all of these is that buying one used and reselling it if one doesn't like the camera for whatever reason is a pretty cost-effective strategy, as compared to the purchase of a digital camera which depreciates like a car. I went through several 4x5 cameras at the start until getting the Chamonix which I really liked and have had since. I even stupidly carried around a massive Toyo GII monorail some distances at the start. I kept that camera because it's practically worthless but it's good for architecture. Going more than 10 feet from my car is a chore. I am glad I had the experience though and learned on that camera the basics of view camera operation...but yes I was pretty quickly Googling "lightest field camera" too!
Bookmarks