Apologies for my one, clearly too geeky for the forum. The answer was a classic piece of advice from Yoda...
"Do or do not, there is no try"
The lens is (as was spotted) a Canon 400mm DO (do), next was a donut (do not), lastly was a rugby referee signally that it wasn't a try (no try). Contrived and nerdy... Over to someone else who has a more sensible please!
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