Somewhere in between :-)
That sounds like an interesting option. What "pancake" lenses are you referring to? I found a 43 mm on B&H which at 5.5 oz. I assume is one of those lenses. What are the other focal lengths?
--John
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John:
The 43 isn't one of the pancakes. There are four that I know about: a 21 f/3.2, a 35 f2.8, a 40 f2.8 and a 70 f2.4 (my favorite.) I've used all but the 35. I tried putting up a link to the B&H page, but it didn't take. Go to B&H and search for "Pentax 40mm," it'll be the second entry down the page. The 40 weighs 3.7 ounces and is 1/2 inch thick. Pentax also has a couple of interesting zooms, including a digital-specific 50-200 f4-f5.6, which is very similar (after accounting for the crop) to a 70-300, and digital-design 16-45 and 18-55 (I think one is a constant f4 and the other a variable aperture, but I'm not sure.)
The 21 pancake will give you about a 30 equivalent on a FF, the 35 about a 52, the 40 about a 60, and the 70 about a 105. The 40 is IMHO a great street-shooting combo, maybe the best available. It is autofocus, pretty fast, and even faster with the in-body IS, which people claim will give 2-3 stops. I wouldn't go THAT far, but I'd say it's close to the equivalent of an f1 (like the Nocti) but with more depth of field. (You wind up hand-holding at 1/15 with good results, though, it's not terrific at higher ISOs.) Google "Pentax 40 pancake" for some reviews.
The pancakes are so small they're weird. Find a Pentax outlet and handle one; you'll see.
Somebody suggested that you look at a Leica M8. I have a Leica M8, and I would not recommend it for backpacking. The M8 shines in a place where you can get to an immediate backup. Also, I just started a thread on the Leica forum about the fact that my camera failed, from cold weather, after about 30 shots -- but the cold weather was only about 32F/1C. Not that cold, really. The ensuing discussion turned up many failures at moderately cold temps.
JC