Re: Camera kit for three weeks in Europe.
I would like to thank everyone for giving their opinions and advice. It's always a challenge.
As expected, there were two basic categories of response.
The first was cut back on the gear and bring just a few items. I acknowledge the point of view; if I was just a tourist that would be valid. But I am both a tourist and a photographer. Sometimes I just act as a tourist; then I can just bring my phone or P&S in case a shot presents itself. I'll see or do what is planned, and buy the book and postcards for memories.
The second category was detailed discussion of which items to bring. This was quite useful, and helped as I settled in on what to bring. As I debated this, I tried packing the items as well as testing how I will carry things.
Briefly, here is the conlustion.
Panasonic 7-14 f/4. I tried the Olympus 7-14 f/2.8, but it's just too big. I did some research, and decided that I needed wider than the Olympus 9-18.
Olympus 12-40 f/2.8. Going for the slightly extra reach over the Panasonic 12-35.
Panasonic 35-100 f/2.8. I was considering the Pansonic 14-140 II, 45-150, even the 45-175. Lots of reach there, but then I did a test shot in a daylight lit room at 100mm and was up to ISO 4000 at 1/100 sec with the slower zooms. I like speed and I like reasonably shallow DOF so I'm going with the faster telephoto zoom.
Olympus 17mm f/1.8 and 25mm f/1.8. These are good, fast lenses for many uses. I will be using them for low light shots, but also for multi-row panoramas. These balance better than the 12-40 on my panoramic head. I was considering the Panasonic 25mm f/1.4, but the Olympus pair takes one slot in my bag, as does the Panasonic.
All of my photography gear fits within a Lowepro Mini Trekker, and slides under the seat on the airline. This includes chargers, tripods, etc. For carrying around, I usually use a Lowepro Hatchback 20L with a Lowepro Omni Sport instead of the provided dividers (these go in a roller bag with the clothes).