Sony announces full-frame Alpha A7s with 4K video output

It wouldn't be NAB without a major 4K announcement from Sony, and that's exactly what we've got here. The company introduced the Alpha A7s at its Las Vegas press event today, bringing 4K video to the popular full-frame mirrorless camera line. The "s" in the new camera's name stands for sensitivity, and to that end it supports an ISO range of 50 to 409,600.

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