Image of the Sigma Canon EF mount lens on the Panasonic S1 using the MC-21 adapter – L mount system camera rumors and news
Using a CANON LENS on the LUMIX S1 with the Sigma MC-21 - YouTube
Mounting Canon lens on the Lumix S1 with the Sigma MC-21 - Matthew Vandeputte
Panasonic Lumix DC-S1 review: Digital Photography Review
Viltrox Ef-l Auto Focus Lens Mount Adapter For Canon Ef Ef-s Lens To Leica Sl2 Panasonic S1 S1r S1h S5 Sigma L Mount Camera - Lens Adapter - AliExpress
Panasonic S1 with the Sigma MC-21 - autofocus test with 12 of my EF lenses - YouTube
Amazon.com : Commlite CM-EF-L AF Lens Adapter for Canon EF/EF-S Lens to L Mount Cameras, Lens Converter for Panasonic/S5/ S1/ S1R/ S1H/Leica SL601/ SL2/Sigma FP Cameras : Electronics