Hi guys I bought a sel20f28 looking for a walkaround lens. I read good comments about this lens but I'm wondering if f2.8 is too less to have a god DOF management. I obviously don't expect to get results that I get with the 50f18 which I love but is too narrow for landscapes and street. Otherwise can you suggest a faster lens? I read about the panasonic 20mm f1.7 but I don't know if there is an adapter slim enough to keep the pancake L&F. Thanks for any suggestions.