Here's the scenario: You're going to a fairly informal wedding, as a guest. You can't be bothered to carry the Oly 12-50mm, it's too bulky, so you have a choice of one of the Oly 12mm, 17mm pancake, or 45mm. Which one do you take, and why? OK - at a push you can take two, one in your pocket. But there probably won't be much/any time for changing lenses. Most photos will be "party" type images - individuals or groups from the waist up. Thanks for your opinions.