STANDOUT FEATURE: The smallest and lightest full-frame interchangable-lens camera with or without a low-pass filter.
Sony Alpha a7 & a7R
Estimated Street Price: $1,699 (a7); $2,299 (a7R)
The a7 and a7R are pretty much identical, except for the sensor. Besides the differences in pixel count and low-pass filter, the a7's sensor provides Sony's Fast Hybrid AF, which combines on-sensor phase- and contrast-detection AF for improved performance on action subjects—the camera can shoot at 5 fps with nonstop AF tracking in Speed Priority Continuous mode. The a7R's sensor doesn't provide phase-detection, but its Fast Intelligent contrast-based AF is about 40% faster than that in the NEX-7 camera (the a7R can do 4 fps in Speed Priority Continuous mode, which is quick considering the massive image file size).
Sony introduced five FE-mount lenses with the new cameras, but they can also use regular E-mount (NEX) lenses, and via adapter, A-mount SLR lenses (with phase-detection AF, via the LA-EA3 and new LA-EA4 adapter). E-mount and DT A-mount lenses were designed for smaller APS-C sensors and will vignette if used in full-frame mode on the a7 or a7R. But the cameras will automatically switch to APS-C crop when such a lens is attached (or you can do it manually with any lens). In crop mode, there's a 1.5X crop factor, and image sizes drop to 10 and 15 megapixels, respectively.
Features shared by the two new cameras include Auto HDR, Sony's Sweep Panorama, 13 Picture Effects, 1200-zone metering, ISO settings from 100-25600 (plus 50), manual focus peaking, a three-inch tilting LCD monitor, 1080p video at 60 and 24 fps, and built-in Wi-Fi with NFC for easy connection. An optional battery grip doubles shooting capacity. Dimensions are 5.0x3.7x1.9 inches and 16.7 ounces (a7) and 16.4 ounces (a7R).