EOS 5D Mark IV Poor-Quality 4K

[wildwoodphoto]

I am struggling with the quality of video in my 5DiV.

I shot a clip on what I understand is the highest quality possible: in 4k 29.97P MJPG / 1/60sec / f10 / ISO 400 / Camera Standard / 5500k on a Laowa 14mm f4 zero-d. The memory card is a SanDisk Extreme Pro 95MB/s 64GB U3 10C XC1.

The result however does not look 4k. I have uploaded the clip to YouTube here: https://youtu.be/RB-qHm0pa-Y

What are the possible reasons for the quality? 

[Waddizzle]

Laowa?  The camera only records what the lens presents to it.

You have not described what it is about the image quality you find unacceptable.  I would not consider play back of videos uploaded to YouTube to be a good metric for 4K Video IQ.

[wildwoodphoto]

As I said, the result does not look 4k quality. And yes, a Laowa: excellent quality, lightweight, zero d 14mm. If there is another way to upload the video to demonstrate the quality, please do advise.

[rs-eos]

What exactly do you mean though by 4K quality? I don't have time right now, but this afternoon I'll try to post two still frames here (including some 100 or 200% cropped portions) comparing DCI 4K between an EOS 5D IV and an EOS C70.  Both will use a 50mm f/1.2L.

On the 5D IV, DCI 4K uses a portion of the sensor (approx 1.7x crop factor).  The sensor sites are still large (5.35µ).  But smaller than the C70 (6.4µ)

The 5D IV would also not have the dynamic range of the C70; especially if you don't have the version with CLog.

In terms of uploading video, it would be best to start off with a few still frames of the original source material (then use PNG since that would be a lossless format).   Or, if you could set up something on DropBox with the original footage, that would also be good.

Again, you'll have to explain what it is about footage you find is not 4K quality.

[wildwoodphoto]

Sorry for delayed reply.

The quality looks good in the LCD, but the quality looks poor when I download the clip from the SD card.

How can I share the original file with you for you to take a look?

[wildwoodphoto]

btw, does the SD card make any difference to quality? I'm using a SanDisk Extreme Pro 95MB/s U3 C10 64GB

[rs-eos]

Please re-read my earlier reply; I provided some details on what you could do to provide both still frames or the original source material.

Without seeing exactly what is going on, we cannot address the issues.  Stating "the quality looks poor" is just way too vague.   Are you seeing color banding? Aliasing? Low dynamic range? etc.?

[wildwoodphoto]

Here's a clip:https://www.dropbox.com/sh/t6zopl0vmgry7hk/AACb5yAk10EkIa4TI9oNKTsga?dl=0

[wildwoodphoto]

Also here is a WeTransfer link:

https://we.tl/t-nWuMiMDE6B

I can't define what I mean by 'poor' just it that looks like an early YouTube video and not something shot in HD

[rs-eos]

The only thing I can pick up on is that the video seems a bit soft.   Which is odd for a 14mm lens at f/10.   Not sure where the focus point was during the entire clip, but near the end it appears to have been on the curtains.  So everything on the table is out-of-focus.

Dynamic range overall isn't the best, but if you don't have the CLog version of the 5D IV, that's to be expected.

I don't have your particular lens, but on my 5D IV (also without the CLog modification), I'll get some still images on here later using a 50mm f/1.2 and 135mm f/135.  No doubt the 135mm image will be sharper as that lens is quite a bit sharper than the 50.