Anyone have experience using theses? Is there a brand that you'd recommend (or not)? Pros & Cons of them? Things to consider when choosing one? Do they work better on some lenses than others? I was at a news conference the other week and saw a photog from a local paper with one mounted on his 70-200mm. In theory they seem like a great idea; you don't have hassle with putting it on and taking it off, the rubber is likely not to crack if knocked up against something, etc... The few that I have found on the internet appear to screw into the front filter treads rather than the lens hood element - I'm concerned that by being screwed into the filter treads, the thickness of the rubber may cause somevignetting.


I was looking to put one on a EF 24-70mm f/2.8L and EF 70-200mm f/2.8L IS particularly.