- Alpha a7 Iv Mirrorless Camera -The full-frame 33MP Exmor R back-illuminated Cmos sensor delivers outstanding speed and superb image quality. The use of copper wiring contributes to higher transmission speeds and faster Ad (analog to digital) conversion, while fast sensor readout enables 10-bit 4:2:2 4K recording up to 60p. The sensor also provides improved color reproducibility, low-noise performance at all sensitivities, 15+stop dynamic range and increased Af (autofocus) speed and precision performance. Experience improved levels of color gradation and detail rendering as well as soft, natural-looking human skin texture.bionz Xr Engine for 8x Processing Speeds.The Bionz Xr engine, also used in the Sony Alpha 1 and Alpha 7SIII models, provides up to an 8x increase in processing speed.