The term "a7R" refers to a series of full-frame mirrorless cameras developed by Sony. These cameras are known for their high-resolution sensors, which allow photographers to capture detailed images with excellent dynamic range. The a7R series is particularly popular among professional photographers and enthusiasts who prioritize image quality. The a7R models typically feature advanced autofocus systems, in-body image stabilization, and a variety of lens options compatible with the E-mount system. They are designed for various photography styles, including landscape, portrait, and commercial photography, making them versatile tools for creative expression.