I am new to 4/3 coming over from DSLR and using the EM1 (when it arrives next week) initially with the 12-40 2.8 (when it arrives) but see a real need for going wider. I travel a lot and that provoked the change. Most of my work deals with conservation so I have lots of great opportunities in some amazing areas. In about 3 week I head out to Costa Rica, Chile and Panama and later on to other Latin American countries. I doubt Olympus will have their wider pro zoom out by the time I leave on my first trip so I would appreciate input as to a good wide zoom (the Panasonic f4, a bit expensive) that I can use until the Olympus comes out or just keep as my wide lens. Thanks in advance for any input.