Panasonic firmware shares more features across S1, S1R, S1H and S5: Digital Photography Review
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Amazon.com : Panasonic LUMIX S1R Full Frame Mirrorless Camera with 47.3MP MOS High Resolution Sensor, L-Mount Lens Compatible, 4K HDR Video and 3.2” LCD - DC-S1RBODY : Camera & Photo
Panasonic Lumix DC-S1R review: Digital Photography Review