I feel sure this must have been noted before, (but not by me).

I was out last night looking for Nightjars, the full moon rose over the horizon of trees shortly before sunset and was looking particularly fine.

The trees were about 2-300 yards away and the adjustment on my binocular focus to change view between the moon and the treetops was negligible.

I'm aware of the optical illusion of the moon looking closer than it is at times, but how does it fool a piece of glass?