No ROM connection on the adapter.
Diaphragm control of the lens is set manually.
Automatic diaphragm, auto-focusing, or any other functions will not operate correctly while using this adapter.
"Stop-down mode" will need to be used when metering since the lens does not have the ability to have its aperture controlled by the camera body.
Made of brass.
Rollei QBM Lens
Canon (D)SLR Camera
(such as:850D/1DX III/250D/90D/4000D/2000D/6D II/200D/77D/5D IV/1300D/80D/1DX II/5DS/5DS R/760D/750D/7D II/1D/6D/7D/5DIII/5DII/100D/700D/650D/600D/550D/1100D/1000D/500D/70D/60D/50D/40D..etc)
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