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Actually, I've read somewhere (somewhere credible, maybe it was cinefex) that 35mm 2-perf has a maximum equivalent resolution of 8.5K, 4-perf is probably then a

Actually, I've read somewhere (somewhere credible, maybe it was cinefex) that 35mm 2-perf has a maximum equivalent resolution of 8.5K, 4-perf is probably then a double or quadruple of that? 2K in output is more than enough today, but there are technical reasons on some cameras to shoot in 4K - for example on RED One. If you don't shoot in 4K, you're not using the whole area of sensor, which results in odd behavior of lenses you're using.

stephen_g 15y ago
You can scan film at whatever resolution you want, but on average (and this varies between different stocks, different film speeds, different processing) you won't get that much effective resolution from 35mm beyond 4K - you just start seeing the grains in more detail! And that is assuming a camera negative. A 3rd generation release print that has been played a few times can have less than 1.8K resolution.