Whether you’re shooting digitally or on film, Fotodiox offers the world’s largest selection of lens adapters. Mix camera/lens platforms or reinvigorate vintage glass; Fotodiox has hundreds of ways to mount lenses onto your DSLR or SLR camera. Our adapters deliver infinity focus, manual aperture control, and a sturdy build for lasting quality. Features: Mounts Pentax K Mount (PK) SLR Lens lenses to Canon EOS EF-S Mount APS-C SLR Cameras High-tolerance precision craftsmanship; infinity focus or beyond allowed All-metal design; hardened anodized aluminum construction Premium grade Fotodiox adapter 24-Month Fotodiox Warranty Compatible with: Canon EF-s (APS-C) System Cameras Only:7D, 10D, 20D, 30D, Rebel xt, xti, xs, xsi, t1i, T2i, T3, T3i, T4, 300D, 350D, 400D, 450D, 500D, 550D, 1000D NOTE: This adapter will not work on full frame EF cameras (such as Canon EOS 1D,1Ds Mark II III, 5D, 5D mark II, etc) and select APS-C cameras (40D, 50D, 60D, 60Da), due to how the adapter sits inside the camera body. This is a manual adapter, so lens functions that rely on electronic communication with the camera body (autofocus, AE metering, image stabilization, etc.) will be disrupted. ‘Focus-By-Wire’ lenses (such as Canon’s STM or Nikons AF-P) requires power to engage the manual focus rings on the lens, since manual lens mount adapters do not power the lens, those lenses will not be able to focus. Set your exposure manually or meter using your camera’s Aperture Priority (stop-down) mode. If your lens does not have a manual aperture control ring, the lens aperture will revert to its default position, which depending on the lens is either stopped down to its largest f-stop or opened up to its smallest f-stop.