Key Features Making the 5D Mark IV Suitable for Video:
* 4K Video Recording: The 5D Mark IV can record 4K video at up to 30fps (frames per second). This resolution is a significant upgrade from 1080p and provides more detail and flexibility for post-production.
* Dual Pixel CMOS AF: This is perhaps the biggest draw for video. Dual Pixel autofocus provides incredibly smooth, accurate, and fast autofocus during video recording. It allows for easy focus transitions (pulling focus) and reliable tracking of subjects, which is crucial for professional-looking video. You can adjust the speed and sensitivity of the AF system to fine-tune how it behaves.
* Touchscreen Interface: The touchscreen allows for easy selection of focus points, menu navigation, and other functions, making it a more intuitive experience for video shooters. Especially valuable when working with the dual pixel AF.
* Clean HDMI Output: The 5D Mark IV can output a clean, uncompressed 4K signal over HDMI, allowing you to record to an external recorder for higher bitrates and potentially less compressed footage.
* Built-in Microphone and Headphone Jacks: The camera has built-in microphone and headphone jacks for capturing and monitoring audio.
* Good Low-Light Performance: While not the absolute best, the 5D Mark IV performs reasonably well in low light, which is important for shooting in a variety of environments.
* EOS Movie Servo AF Customization: Allows fine-tuning of autofocus tracking sensitivity and speed during video recording.
* Crop Modes: While the 4K recording is cropped (about 1.74x), it can sometimes be beneficial. It can effectively increase the reach of your lenses. And, 1080p is full-frame.
Why it Was Popular (Context of its Release):
* Reputation and Reliability: The 5D series had a strong reputation for image quality and reliability, making it a safe choice for professional filmmakers.
* Full-Frame Look: The full-frame sensor allowed for a shallow depth of field and a more cinematic look, which was highly sought after.
* Cost-Effective Option: At its release, the 5D Mark IV offered a relatively affordable entry point into high-quality 4K video with professional features.
* Familiar Canon Ecosystem: For existing Canon users, the 5D Mark IV integrated seamlessly into their workflow.
Limitations:
* Crop in 4K: The 1.74x crop in 4K recording can be a disadvantage if you need a wide field of view.
* No Internal Log Profiles: Lacking Canon Log profiles (C-Log) internally, you'd have to record externally or use picture profiles to achieve a flat picture, limiting dynamic range compared to dedicated cinema cameras.
* 8-bit Internal Recording: The internal recording is 8-bit, which can limit your ability to grade the footage in post-production compared to 10-bit or higher recording.
* Rolling Shutter: Like many DSLRs, the 5D Mark IV suffers from rolling shutter, which can cause distortion in fast-moving scenes or when panning quickly.
In summary:
The Canon 5D Mark IV was a compelling option for video shooters because it provided a combination of 4K resolution, excellent autofocus, and a full-frame sensor at a relatively affordable price. Its Dual Pixel AF was a game-changer for many, making it easier to capture professional-looking video. While it has some limitations, it was a solid choice for many filmmakers, especially those working on a budget. However, in the current market, there are many other cameras offering similar or better features for the same or lower price, so its dominance has diminished.