The Sony Alpha 7R is a full-frame E-mount mirrorless camera. The A7R is very similar to its less-expensive sibling (the A7), except that it uses a 36 megapixel CMOS sensor with no optical low-pass filter. The A7 twins are the smallest and lightest full-frame cameras on the market.
While the cameras can use any E-mount lens, there will be a crop factor involved (unless you don’t mind vignetting). Sony is producing a new line of FE-series lenses that take advantage of the larger sensor.
Sony Alpha A7R III stands to be one of the best mirrorless cameras ever made. It can shoot at twice the resolution of the A9 and has an autofocus that’s twice as fast as the A7R II, although it’s worth remembering that the A9 offers faster burst shooting. But the lower price and heightened performance are likely more than enough to impress pro and novice photographers alike.
The A7’s use the new Sony Bionz X processor, which produces images with better detail, less noise, and reduced diffraction. Other features include a 3-inch, tilting LCD, XGA OLED electronic viewfinder, Multi-interface (hot) shoe, Wi-Fi with NFC, and 1080/60p video recording.