Features:
Allow M42 42mm screw mount lenses to be used for Canon EOS EF cameras.
It can focus to infinity. Stop-down metering can be used. Spot metering mode does not work properly.
There is no ROM connection on the ring so diaphragm control of the lens is set manually.
Supports AV (Aperture Priority) and M mode.
Auto focus (AF) is not available.
Inner ring adjustable.
Material: Aluminium
Net Weight: 33g/1.16oz
Color : Black and Gold.
Compatible with:
Lens: All M42 42mm Screw Mount Lenses  
Camera: for Canon EOS EF Mount DSLR cameras, such as for Canon 100D/200D/200D II/350D/450D/500D/600D/650D/700D/750D/760D/800D/850D/1000D/1100D/1200D/1300D/1500D
10D/20D/30D/40D/50D/60D/70D/80D/90D/1D/1Ds/1Ds/1Dx Mark III
5D/5D Mark II/5D Mark III/5D Mark IV/5DS/5DS R/6D/6D Mark II/7D/7D Mark II etc.
Note: It is not for EOS R Mount and EF-M Mount Series Mirrorless cameras.
Tips:
1. If your camera indicated "lens is not properly installed", please modify the camera menu settings.
2. Usually called the release the shutter the lens is not installed", you can modify the settings to allow. Specifically refer to the camera manual.
3. Although the lens will fit physically, automatic diaphragm, auto-focusing, or any other functions will not operate correctly while using this adapter.
4. In this case "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. You can shoot with manual mode or aperture priority mode. Before use, set your camera Menu: "Shoot without lens".
Package Including:
1 * M42-EOS Lens Mount Adapter
1 * Wrench