Bob Engelhardt wrote:
I've been meaning to ask about that (red dot parallax). ... - I
thought that no-parallax was a main feature of red-dots. ...

I did find something about this: Aimpoint says that their red dot is
parallax free at 50 m & beyond. At less that that, there is parallax.
I.e., the dot needs to be held in the center of the sight. It's not at
all obvious to me why that should be, but there it is.

Bob