I miss the 90 degree angle of view. Used it a lot in OM days.
Question: Is there any native 90 degree (21mm equivalent) lenses (non zoom) in any of the mirror-less systems? I'd consider buying into that camera system just for the lens. I'd go other brand if need be. Max aperture not really a issue.
Unfortunately a M9 with 21mm is... well outside my spending comfort.
I've looked at the adapter for the Panasonic 14mm that takes it to 20mm equiv but the results are not great.