Camera kit for three weeks in Europe.

john isaacs wrote:

I will be in Prague, Vienna, and Budapest.

Leaving the Olympus 12-40 f/2.8 behind because I want some consistency in filters.

What a mistake. Please reconsider that decision. The M.Zuko 12-40mm F/2,8 is the best standard zoom for cameras that have IBIS. If sharpness has a greater importance to you than being able to use of a polarizer filter, please bring that zoom.

- Olympus 9-18. While I have both 7-14s, I like the small size and ability to use regular filters. Will bring 52mm polarizer plus 52-58mm step up for other filters as needed.

IMHO, Prague is the most beautiful city in the World. It has spectacular churches and castles. Some have extraordinary ceilings (namely the St. Nicolas Church in Malá Strana).

7mm and 9mm give very different points of view. In Prague you must have the widest lens that you can bring. The M.Zuiko 7-14mm is big and heavy but it is indispensable. Finally, to shoot at ceilings, you don't need polarizing filters. Moreover, in the narrow medieval streets of Prague, you'll appreciate having a lens that stats at 7mm.

- Olympus 12mm f/2 prime. I like some faster lenses for shooting indoors, and this is one of them.

Fine. I like that lens for street photography.

- Panasonic 25mm f/1.4.

Very good choice.

- Olympus 45mm f/1.8. Good for indoors and portrait.

Your PanLeica 25mm F/1,4 will be more useful

Small and light. Not bringing the 75mm f/1.8, again due to size and weight

I couldn't disagree more. A telelens won't be the most useful lens in a city like Prague (where beauty is everywhere) except to catch small details. But you need one.

Outdoor, the choice is not that important. But indoor, you'll need the brightest tele prime (and crop your photos as needed): for now, that lens is the M.Zuiko 75mm F/1,8.

So my suggestion is : the M.Zuiko 12-40mm F/2,8, the PanLeica 25mm F/1,5, the M.Zuiko 7-14mm F/2,8 and the M.Zuiko 75mm F/1,8. Other lenses if you like.