you can't use petal hoods on the 18-55. This lens has turning front lens element so your petal hood will get turned together during AF. There is a reason why the OEM hood is round instead of petal.its the petal type. Ususally the problem occurs when I zoom in on a subject.
Sorry bro I have to correct you: EW is for wide-angle lens and ET is for telephoto; you're correct on that but those acronyms do not represent petal or round hoods. The hoods for 70-200 f/2.8 are petal hoods and they are ET-83 and ET-86 respectively.Just take note. EW hoods are petal hoods and ET hoods are round hoods. The W stands for wide angle/UWA (focal length < 50mm) and T stands for telephoto (focal length > 50mm). Check online which hood better suits your lens type. Like when I first bought my 100mm macro, i told the retailer i am looking for petal hood, and they recommended me round hoods for the above reason. does your hood state whether it is EW or ET?