They're not necessary to shoot with the lens. It doesn't let you autofocus or control the aperture from the camera body, since the mechanical linkages don't exist but you can get autofocus confirmation and EXIF information from these chips. There are 3rd party chips out there that you can glue onto manual or adapters that "fake" being a Canon chip. You manually have to set the focus with the lens's focus ring (no autofocus, since that require body/lens communication), and you manually have to set the aperture with the lens's aperture ring. The Samyang/Rokinon lenses do not have this chip or any electronic or mechanical communication with the camera bodies, which is why they're so cheap and come in any mount-they just have to physically fit the bayonet. aperture, lens name, aperture setting used, etc.)Ĭanon EOS lenses have a chip on them that communicates information from the lens to the camera and vice versa. And there is no lens EXIF information (focal length, max. There is no autofocus confirmation "beep"/green dot lighting up. You cannot shoot in modes other than M or Av, because the camera cannot adjust the aperture setting on the lens. It will mount, you can focus it, you can set the aperture, you will have accurate stop-down metering, and you can take an image with it. Rokinon/Samyang lenses will work on your Canon body, but for a given value of "works".
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