I would try and pick up a 2nd hand Canon 5d - full frame so the fov wont change and plenty of cheap OM mount - EF mount adapters around.
Lots of good info here: http://forum.manualfocus.org/
If you can't strech to a 5d then a cheaper Canon will do but you will lose full frame (along with viewfinder size) but would still be less of a crop than u4/3rds
@danb started
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I would try and pick up a 2nd hand Canon 5d - full frame so the fov wont change and plenty of cheap OM mount - EF mount adapters around.
Lots of good info here: http://forum.manualfocus.org/
If you can't strech to a 5d then a cheaper Canon will do but you will lose full frame (along with viewfinder size) but would still be less of a crop than u4/3rds