Looking to use my GX1 for a DIY photobooth. Was thinking of using the Panasonic 20mm but have concerns about not getting everyone in focus when they are staggered. Any suggestions to getting everyone in focus? I also have the Oly 45mm, Panny 14-42mm/F3.5-5.6 and the Oly 40-150mm f/4-5.6. Also have a 35mm f1.7 C mount but not sure if that would work. Not sure about space so backing up might be problematic. Lighting my not be as good but I can bring a flash. Thanks for the help!