I think I’m about through with any scope over 10x. That seems to be the place where they get iffy with eye-relief, eyebox etc. maybe I need to spend more money on them….
That's exactly why most (but not all) scopes above 10x have some sort of parallax adjustment.
It's also partly why the 5-15x Zeiss I mentioned earlier in this thread had so much parallax on 10x. The other reason was its big objective lens, which as I recall was around 50mm.
