No experience with 23v. Just 19-a & the xq30f. Randy can see things I can't. I have not looked to see if his lens is convex. He is not sure,
but from the pictures I have seen, & from looking through it the picture is sharp, the distance is great & there is a lot of focus.
I think it is convex. I won't be getting rid of my hd19-a, but if I
was to buy a new one it would be the XQ30F