a7R4 with the 10-20mm f/4 PZ

[The_Gregors]

I know it is not ideal, but I am really interested in the 10-20 on a future light weight body yet to be released for vlogging work.  Right now I only have access to my wife’s a7R4 that she uses for weddings/portraits.  Besides vignetting, will the 10-20 work on a Full Frame?  Thank you. 

[LensBrew]

Sony's mount system lets use FF lenses on APS-C bodies and APS-C lenses on FF bodies, and this is now being copied by other brands.

The lens will work perfectly fine, but you'll need to go to APS-C mode (super 35) to remove the "vignetting" and this will make the lens 15-30mm. Therefore, in addition to changes in the focal length, your image will have approximately 24 Mpixel resolution.