Thanks John.
Thats very useful. Always good to know its NOT one's eyes playing-up.
I got double confirmation from my leasee about 20 minutes ago. He's a birder and spent more on his 80mm Leica spotting scope than I did on the TAk!!! He noticed it right away unfortunately.
I too suspect a bump. Don't think I'll try any DIY re-collimation though!
