I'm trying to learn a little bit more about how huds in military planes are able to get their info projected onto "infinity" (whatever distance is enough, like 10 meters or so??) so that pilots don't have to refocus constantly on looking between the outside world and the information on the HUD. Consumer-grade huds available on cars doesn't care for this, which I think it's outrageously dangerous. Often this automobile huds have their focal length right at the windshield... So even with collimating lenses I don't quite get how is this achieved (note: I'm not a physics student, just a concerned mind)...
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