Rokinon Cine DS 135mm T2.2 ED UMC for Canon EF  type_Adapters The Canon 580EX II is

The Canon 580EX II is a powerful TTL flash for use on any Canon DSLR camera

not for mirrorless cameras

lens for the Canon FD manual-focus lens mount

NOTE: this is not for the manual-focus C/Y mount

for some reason

Rokinon Cine DS 135mm T2.2 ED UMC for Canon EF &nbsptype_Adapters The Canon 580EX II isThe Rokinon Cine DS 135mm T2. 2 ED UMC is a fast short telephoto designed for video use, with smooth geared focusing and a geared, stepless aperture control for use in followfocus systems. Of course, you can use this as a stills lens, too. Clean glass, excellent image quality, full frame coverage. This lens is in EF mount for Canon EOS film and digital cameras (or any other systems that use the EF mount). Please note that this is a manual focus lens