In recent years, a number of digital cameras have offered the ability to record high-resolution 4K video which brings many benefits to both photographers and videographers. This ‘benefits of 4K video’ list includes the ability to not only record high-resolution video but also the option to take 8-megapixel still images from the footage. Plus, the technology is now built into cameras of various price points so it doesn’t matter if you have a few hundred quid to spend or thousands of pounds in your back pocket, you’ll be able to find a 4K camera you can afford.
There are two main types of 4K video: UHD, and Cine-4K. All cameras that record 4K video will record at least UHD video but not all cameras record Cine-4K.
UHD (Ultra High Definition, also known as QHD / Quad HD) is 4x the resolution of FullHD video, with a resolution of 3840 x 2160 and 16:9 aspect ratio while Cine-4K has a 4096 x 2160 resolution and a 17:9 aspect ratio. Cine-4K (also known as DCI-4K) is designed to be the resolution used for cinema movie recording, while UHD is used for most 4K televisions.
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https://www.ephotozine.com/article/best-4k-cameras-you-can-buy-in-2018-28382
