dmcgrew
Well-Known Member
For me, it comes down to the media the content will be played on.
Print: then anything over 200 dpi is pointless. Who uses printed photos these days? Nearly everyone uses a 1k or less phone for personal images. So even 4k is 4x overkill. And to do a billboard at 100dpi, you need gigapixels - so it just isn't what people strive for.
Video: Less than 45% of the US market owns 4k TVs. That percentage is growing, but the trend will continue to be 4k, and 8k is a niche. With content creators using a phone to edit (to which I said "Really?") - because why use 4k cameras if you edit and display on 1k devices? But back to media: where do people show off 4k video? How many people watch YouTube on a computer with a 4k monitor? Especially when only 35% of us own them. Yep, 50% of computers out there are HD 2k displays, the rest under 2k.
Actual Display Quality: When you ship data via YouTube, even 4k video, YouTube doesn't provide true 4k. The file is compressed, and the actual video data rate is woefully truncated. So capturing a 200Mb/s video stream is pointless if your target media is YouTube since the actual 4k data rate throughput is often well below 50Mb/s. And then consider it will still be played on a phone at 720p or a computer at 2k.
Sure, on YouTube demo reels I can get to 60Mb/s and a bit more sustained, but that's a contrived test case. Here's a typical drone capture footage being played from YouTube to my 4k monitor, it's barely using 10Mb/s.
So what good is 4k capture? Probably the same reason people bought 16mm film cameras instead of Super 8 film cameras; or 645 or 6x7 instead of 35. While a limited few know there is some inherent technical improvement, and have editing gear commensurate with the increased requirements it brings, for most it just sounds better over drinks on Friday night when meeting with friends.
Billboards are usually printed around 15 dpi. You don't need some crazy camera to make a photo that gets put on a billboard. Lots of people print their photos. Printing is one of the best parts of doing photography. Personally for me, I sell my prints. Selling my drone photos is a huge part of my business and I'll take any extra quality I can get especially in dynamic range and low light noise.
I used to think 4k - 8k was pointless until I realized that a good use for it is cropping. Imagine you have a final video that needs to be output in 1080p but you record in 5k.. that gives you a ton of room for cropping.