What lenses will this fit, or is it universal?
I always use the lens hood on my lenses, and it will not fit all lens hoods. It will work on the hood of a lens like a 50 f1.4, 85 f1.8 etc. in that size range. It would not fit the hoods on my 77mm diameter lenses. Haven't tried it on the barrel of the larger lenses without the hood, as I don't shoot like that.