EMF AF confirm adapter for Olympus OM lens to Canon EOS EF mount - 5D III 6D 650D 700D 60D 70D Laowa so you need to do

so you need to do "lens scale-focus"

Canon: G12

For using Sony E mount mirrorless digital cameras with all Pentax K mount AF lenses

alignment and markings of aperture may not be exactly straight to camera

Optical structure: 11 elements in 8 groups

EMF AF confirm adapter for Olympus OM lens to Canon EOS EF mount - 5D III 6D 650D 700D 60D 70D Laowa so you need to doThis is the programmable EMF AF confirm chipped lens adapter ring with built in circuit board for Olympus OM mount lens on your Canon EOS EF mount camera, saving you the expense of a costly and irreversible conversion. Please refer to EMF AF Confirm Chip For M42 Lens To Canon. docx for programming . (Please contact us on compatibility of camera model, best for models older than EOS 700D) Allows focus infinity.