coffeecoffee :
E.g. Using an entire basement wall as a ultra 8k spreadsheet display
Okay, so you've obviously never used one. According to http://www.pcworld.com/article/3039822/, it's limited to 1268x720 per eye. So, the effect would be no better than zooming and scrolling around in a 8k spreadsheet on a 720p monitor. Interestingly, that article also says they don't recommend displaying graphics more than 5m away or closer than about 1m. So, you wouldn't be able to get as close to the virtual display surface as you probably get to your monitor.
So, why did you reply to my post, if you wouldn't/couldn't answer my question about the FoV? I did I
specifically ask about Hololens - not AR, in general.
Anyway, as I'm currently developing a non-gaming AR app, I'd like to think I
do understand AR and its potential.