In very simplistic terms the 4K on the 5D-IV is a collection of good quality JPEGs and that is why the size gets so high. You can use the proxy file methodology within many video editing softwares to edit 4k from a 5D-IV on a non-highend computer. As an aside I use SD cards for 4k rather than CF cards because SD's can save one large file of any
Package - Canon - EOS 5D Mark IV DSLR Camera (Body Only) and EF 16-35mm F2.8L III USM Zoom Lens for EOS DSLR Cameras - Black User rating, 4.9 out of 5 stars with 786 reviews. (786)

DCI 4K video at 30 fps with 8.8-megapixel still grabs; You could probably even make do with a 21-megapixel Canon 5D Mark II, but without significant cropping. Focusing.

Canon鈥檚 iconic EOS 5D series of full-frame DSLRs have had wide appeal with both pro and enthusiast photographers, blending great image quality and good features in a more affordable mid-range body design. Boasting a significant number of upgrades over its predecessor, including increased resolution, an updated autofocus system, Dual Pixel RAW capture, improved metering and 4K-video capture

DCI 4K resolution will be increased to 5632 x 2970 or 1.27x crop factor. UHD will go up to 5472 x 3078, or 1.29x. 1:1 4K sampling will remain an option for those who want to use the 1.74x crop
诪爪诇诪转 专驻诇拽住 Canon EOS 5D MARK IV 讙讜祝 讘诇讘讚 诪讜爪专 讞讚砖. 诪爪诇诪转 专驻诇拽住 讚讬讙讬讟诇讬转 拽谞讜谉 EOS 5D MARK IV 30.4 诪讙讛 驻讬拽住诇 诪注讘讚 +DIGIC6 诪住讱 诪讙注 3.2' 1.62 诪讬诇讬讜谉 谞拽讜讚讜转 爪讬诇讜诐 讜讬讚讗讜 DCI 4K @30fps 讗驻砖专讜转 诇诇讻讬讚转 转诪讜谞讛 讘专讝讜诇讜爪讬讛 8 诪讙讛 驻讬拽住诇 讘诪爪诇诪讛 诪转讜讱 住专讟讜谉 4K 1080p@60fps / 720p
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canon 5d mark 2 4k