Interested in Michael Topham's test of this new telezoom from Canon in the latest issue by his passing reference to the lens hood. Not the most exciting aspect of a new lens, I hear you say, but it seems Canon have caught on to something Pentax have been doing for some time now. The ideal conditions for a polarising filter are in bright light. These are also the conditions when a lens hood is particularly necessary. A shame, then, that the two are not really compatible - you need to be able to hold the filter to roatate it, and if the hood is deep enough to have any real effect you can't. Pentax came up with a solution: the earliest use of which that I'm aware of being with the 24-90 introduced in 2001. There's a removable section of the hood which allows you to rotate the polariser. As it's at the six o' clock position there's little risk of the flare you're looking to avoid by fitting the hood in the first place. From what Michael says it would appear Canon are now doing this. Unlikely, I know, but it would be great if they now made similar hoods available for some of their earlier lenses too.