Talking about reality as an unknowable is completely and totally pointless.
Talking about it from a quantum physics point of view isn't saying it's unknowable. It's saying it's knowable from a different point of view, that of quantum physics.
And a fascinating one at that. We know that light emited by an object doesn't immediately reach our eyes. That means that something even a few meters away is already slightly in the past when we see it. And the further the thing observed, the further in the past it is.
Moreover, we also know that because of gravity time doesn't run at the same speed if your on top of a mountain than if you are at sea level.
Both these things mean that contrary to what we think, or rather, perceive, there is no such thing as a common present, a common "now".
So this means if you are on top of a mountain in the Alps or the Rockies photographing and that in your frame you have another mountains many kilometers away, some trees nearby, and a valley below, you are not photographing "a" moment in time, a common present of all that is seen. You are photographing many many presents stiched together by your brain, or rather, by its limits.
And nobody seen in these different places are "now" even though your eyes, and the photograph, are telling you differently.
Now I find this stuff - the knowability of this stuff - fascinating. And this is, at times, also what I talk about when I talk about "what is reality", a reality in which the idea of photography being "capturing a moment in time" makes no sense.
Not the only way to see it, but an interesting, challenging and necessary way.
But that's just me.
