In both photos, the Voigtländer Super Wide-Heliar II 15mm F4.5 was mounted, and shooting was done with the lens stopped down to F8. With the α7R, there is a magenta color cast at the periphery, and significant vignetting. With the α7RII, in contrast, there is almost no peripheral color cast, and only mild vignetting. This is the power of a back-illuminated CMOS sensor with superior performance for oblique incident light.
α7R II with back-illuminated full-frame image sensor
Higher resolution, sensitivity, and readout speed As the world’s first* 35mm full-frame image sensor with back-illuminated structure, this 42.4-megapixel CMOS sensor enhances light collection efficiency, expands circuitry scale, and, with the help of a quick-transmission copper wiring layer, outputs data about 3.5 times faster**, while minimizing image noise to reveal fine details in every picture.
*Among digital cameras with a full-frame image sensor. As of June 2015 press release, based on Sony research. **In comparison with the α7R.