The Blackmagic Multiview 16 makes full use of the fact it is the world’s first multi-viewer with Ultra HD as its native resolution. Having twice the sharpness and standard HD, it is easy to display up to 16 simultaneous views. You do not even have to be using UltraHD recording or capture equipment, just an Ultra HD or HD monitor. The viewer will accept up to 16 different SD, HD or UltraHD SDI sources and combine them into one easy-to-view display. There are options to display 4, 9, or 16 views and each input includes a full-frame re-synchroniser .

Blackmagic Design MultiView 4 HD – Multi Source with 4 Independent 10-Bit SD-SDI and HD-SDI Inputs (BMD-HDL-MULTIP3G/04HD). Monitor up to four different SD and HD Sources on the same display at the same time.
The MultiView 4 HD model is a low cost multi viewer that lets you simultaneously monitor 4 different SDI video sources on a single display. Each view is a completely independent video monitor with overlays that you can turn on and off such as custom labels, audio meters and more.