The left image is shot with the EF 24-70mm and the adapter. You can see the problem of the focus falling off on the edges. On the right image, shot with the RF 24-70mm, you can see the edges
"The Canon EF 24-70mm f/2.8 L USM Lens is an impressively high performing zoom lens. I regard it as one of the best general purpose lenses available and for the same reasons, it is one of the most-professionally-used Canon lenses. The 24-70 L is as good as it gets in this focal length range.
Canon EF 28-70mm f/2.8L USM Lens : Year Introduced: 1993: Year Discontinued: 2002: Mounts On: Full-Frame, APS-C: Lenses / Groups: « Canon EF 24-85mm f/3.5-4.5 item 4 Genuine CANON EF 24-70mm F/2.8 L II USM lens Diaphragm Aperture Parts YG2-3001 Genuine CANON EF 24-70mm F/2.8 L II USM lens Diaphragm Aperture Parts YG2-3001 $99.09 No ratings or reviews yet No ratings or reviews yet 24-70mm f2.8 lenses have been staples in professional photographer's bags for years, and for good reasons. Buy now Canon EF: $1,069. Buy now Nikon F: $1,078.99. Tamron SP 24-70mm F2.8 Di VC . 215 18 359 126 175 71 24 5