The Summilux SL50 ASPH is a whale. If you've got it, this tip may be useful.
I shoot vertical mostly (and often need to line up the entry pupil with the pivot without the flimsy panoramic tra-la-la).
The Novoflex Adapter Collar Mount ASTAT-SL designed for the Vario-Elmarit-SL 24-90mm and has an inner diameter of 84.8mm. The Summilux SL50 ASPH, has an outer diameter of 85.5mm and is a shade too fat to fit the ASTAT-SL collar.
A thinnier inner nylon ring would do the trick but is not forthcoming from Novoflex for the time being; so this is my solution: a longer screw.