Recently I have been reading several books by Galen Rowell and also one by his wife Barbara Cushman Rowell. One of the things that hits me square in the face is that the Nikon 35mm camera/lens combination that Galen usually carried with him on his wilderness travels weighed much less than my D300, which has the MB-D10 second battery. I find that many times when I am going out hiking in the wilds I leave the D300 at home and bring along the D40 with a prime lens mounted on it. There are many things that the D40 won't do quite as well as the D300, including using a GPS, but the D40 is so much lighter that I really do notice the difference. The Op/Tech camera strap I recently added helps greatly on the D300, but with a good lens mounted on it the combination is still really heavy. I have several old Nikon 35mm film SLRs that I could use, but I vastly prefer digital (RAW) primarily because of its immediacy and the vast range of opportunities that you get through good software like Photoshop and Capture NX. It is just too bad that all the really good cameras, which approach the resolution and color depth of 35mm film, are so darn HEAVY!