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hmm, looks like the protrusion on the Nikon F 20/2.8 AI-S pushes the canon ef contacts down.
Nikon 20mm 2.8 via Canon SB on 5n,
When designing the Speed Booster we checked several dozen Nikon lenses for interference, including 35/1.4 AIS, 28/2.0 AIS, 28/3.5 AI, 24/2.0 AIS, 24/2.8 AIS, 16/3.5 AI'd, 15/3.5 AI, *and* 20/2.8 AFD. We only discovered the 20/2.8 AIS interference issue about a week ago. Groan!