Here is a 2nd vote for the Rollei 35. Where light weight, mechanical reliability, and battery independency are important, the Rollei 35 can't be beat. When I used to do backcountry skiing (solo) where weight is definitely an issue just to keep your balance. I would choose my Rollei 35. I have used mine in temperatures as low as -40 degrees C. This also equals -40 degrees F. Do the math conversion if you don't believe me. Jet fuel must not freeze before -40 that's how I know.