Canon 600mm lens hood dimensions

Hi, I just measured mine, it's 21cm long & the diameter is 18cm but you have to add on 2cm for the tightening screw (so 20cm diameter), although the lens hood has a cut out section so the tightening screw isn't actually covered by the supplied hood.

You do get a lens hood cover with it, it's solid pastic at the end but the sides are soft.
 
make one out of black card? Leave it on the lens barrel, push out when you want it untill it starts to vignette?
 
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