I have been doing some architecture photography with my GH2 and would like to step up my work a notch. Two things I'm looking for are a wider lens than my current widest lens, the Panasonic 12-35, and a tilt lens option. I have been thinking that getting out of the m43 format and going to the Sony A7 might be necessary to accomplish this. That would be an expensive change and would it be necessary? Fotga and DLC both offer low-cost, m43, tilt adapters for Nikon or Canon lenses. Both Nikon and Canon have APS-C zoom lenses in the 10-24mm range. Sigma and Tamron also have ultrawide lenses for APS-C. Can anyone comment on using one of these APS-C ultra-wide lenses on a m43 camera, with or without, a tilt adapter? I don't know if the available tilt on these adapters is sufficient, either. Comments on them would be appreciated. I understand that this arrangement would be completely manual to use, but that is not an issue. I am very familiar with using manual lenses and buildings tend to hold still.