Hi all, I'm going on a trip to India for business in December. I have an Olympus OMD-EM10 and want to bring just one lens with me as I probably won't have much time for photography anyway. Suggestions on one lens that I should bring? I have the 20mm panny, 45mm oly and 12mm oly. I was thinking about buying the 25mm oly to bring. Thoughts?