Those Canon dots must be very well and substantially engineered to be so heavy!
Quick quick thinking......
Must be some canon secret alloy of plutonium....
Same with me. Never seen one without a dot. It's especially useful on the TS-E 24mm II because of its rotating design, you cannot guess the correct orientation of the mount that easily based on lens inscriptions or infinity focus marks because they rotate.
My TS-E 24mm II also has a red dot.
This is what alerted me too it. I'm so used to looking for the dot, as I have no idea what orientation I left the lens in last time I used it.
Blame the corn flakes.
You're on fire rob!
It was all a bit fishy, the seller was a 'student' who had two copies of this lens - what student owns 2x $2500 lenses?
It made me wonder if it was a repaired version of the lens...