Originally Posted by Najib
Are you sure it's the ET-65, and not the EW-65? You may have discovered that hood on that lens, but that's not the hood that was designed for that lens. Hoods for zoom lenses are designed to protect from flare at the wide end, not the long end (else, they would vignette at the wide end; the exception is the 24-70mm f/2.8L with a reverse-zoom, so the hood is effective over the whole zoom range). Canon hoods are named EW, ES, or ET (W = wide, S = standard, T = telephoto). So, any hood designed for a 28mm lens (including zooms that start at wide angles) will be EW hoods.
But, whatever the reason, if you have an ET-65 II hood, it will work on the 85mm f/1.8 just as well as an ET-65 III. Of course, even an ET-65 III is not going to fully protect an 85mm f/1.8 from flare unless you're using it on a FF body. If you have an EW-65 II hood, using that on an 85mm lens is better than nothing, but not really going to offer much in the way of flare protection.
The only thing you're missing is the flocking. The number is the diameter of the hood mount (65mm in this case), and Roman numerals after the number indicate a modification to the characteristics of the hood but not to the length or shape. If there's a letter after the number, it's a different shape (e.g. the ET-65B, which is intended for the 70-300mm zoom). In this case, I believe the ET-65 II has a simple plastic interior, while the ET-65 III has flocking on the inside to reduce reflections.
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