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I've preordered the a7Rii, intending to use it with several Canon EOS EF (full frame) lenses. I've also ordered the Sony FE 28mm f2 "native" lens. I'm reluctant to get a $400 Metabones iV adapter if a $100 adapter will work nearly as well. However, when I read the specs on the Fotodiox ebay web-site and the BhPhotoVideo.com web-page, the wording seems to indicate that the camera + lens + adapter will operate in "crop mode". Here are links to the FotodioX adapter that was recommended by Brian Smith: http://briansmith.com/gear/sony-lens-adapters/ http://www.bhphotovideo.com/c/product/994949-REG/fotodiox_eos_auto_nex_p_adapter_for_canon_ef.html http://www.ebay.com/itm/Canon-EOS-Mount-Lens-to-Sony-NEX-E-Mount-Camera-w-Full-Automated-Functions-/361291413449 The image of the adapter indicates "EF-NEX Auto", which suggests "crop mode". Or not? On the FotodioX webpage: Note: Canon EF lenses will activate the auto-crop function of full frame E-mount cameras such as the Sony A7, if auto-crop is turned off then EF lenses will vignette on full frame E-mount cameras. On the B&H webpage: The Adapter for Canon EF and EF-S Lens to Sony NEX Mount Camera (Auto) from FotodioX allows a Canon EF and EF-S lens to attach to a Sony NEX camera body. Adapting a larger format lens to a smaller format sensor provides optical as well as practical advantages. The smaller image field helps minimize the effects of lens distortion and aberration by using the center or "sweet spot" of the larger lens' image circle, thus providing edge-to-edge sharpness