The Sony Cyber-shot DSC-RX1R is a variation of the RX1, which had the impressive distinction of being the first full frame fixed lens camera to enter the market. The variation of the RX1R (the R stands for "resolution"), is that it lacks the anti-aliasing filter of its counterpart. Optical low-pass filters minimize moire and color artifacts, but slightly soften images. With the absence of that filter, the RX1R gains sharpness and higher effective resolution, but may require more post-processing to counteract moire.