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Is there anything stopping these guys from covering the whole view field ?

I've tried a number of VR headsets and they all feel like a stopgap solution, there has to be something better than wearing 2 x 4" screens mounted in a cone on your head....

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The same thing which is stopping anyone from covering the whole visual field, the need for serious technological innovation. It's possible they've figured that out, but who knows.

This is AR, not VR, right? The two are quite different. VR does not aspire to be AR. It seeks to completely replace the world around you, not just add onto it.

From what I understand, upcoming VR headsets like the Rift and Vive have pretty solid FOVs, but Microsoft's HoloLens AR headset has a significantly more limited FOV.

Microsoft does. ;) AFAIK that's because they're trying to keep the price-point low, since they're aiming for consumers.

Edit: AFAIK, the tech they're using can support a wider FOV, but then the price jumps pretty quickly. I definitely do NOT know for sure, however; that's just what we figured when they were first announcing.

Microsoft could slightly enlarge the Hololens FOV for a significant increase in cost, but it still wouldn't be good. They would have to change the display technology they use to have something immersive.

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