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in part, it may serve as a substitute to highdpi monitor while you’re in Hawaii

It's not highdpi. It's only 4K per eye and that's over the entire field of vision.

Highdpi would be 4K on a 24" screen a foot or two away. The vision pro spreads those pixels out over a much bigger angle.

It's got enough pixels to equal a few 1080p monitors though.

I have one and have been using it as an external display, i find the resolution fantastic

That's great, but it's absolutely not high DPI. iFixit estimates the pixels per degree (ppd) of the AVP at ~34 [0]. A MacBook Pro at 20" is over 90 ppd [1]. A 27" 1920x1080 display at 22" would match the AVP at 34ppd.

[0] - https://www.ifixit.com/News/90409/vision-pro-teardown-part-2...

[1] - https://en.wikipedia.org/wiki/Retina_display#Models

That may well be but it's not 4K unless you stretch it out over the entire field of view which would be crazy huge :) at a normal size it would be about 1080p effectively, maybe a little higher.

See also this post which has more numbers: https://news.ycombinator.com/item?id=39323574

That tanline will be worse than a snowboarders.

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