Travel is unique - hiking even moreso. Less is more and it's where zooms shine. I'll almost always pack the fisheye and 21mm now, along with the 18-135 and only if I really think I'll use it, the 55-300. The first two lenses are small and unique, the third is the workhorse and the last totally depends on what i'm doing. I rarely pack the 100mm macro or other special stuff unless part of the reason I'm traveling would benefit from that. Even so, the 18-135 around 70mm-100mm does a serviceable job.
That said, I always overpack. Even when I backpacked as a kid, I overpacked.
Last time I flew with the K5 I only took the 18-135. I was surprised how well it did through the airplane window. Yes, you can tell it was through the window and 40K feet of atmosphere, but over the Rockies I got some really interesting images.
Last edited by TER-OR; 07-21-2015 at 01:04 PM.