I bought the Hoya HD Digital UV filter for my replacement Nikon 16-85mm lens, I don't use it for its UV or Haze reducing effect, but to protect the front element of the lens. There is great debate about whether to use porotective filters or not, the purists claim that protective filters degrade the picture. A few years ago I irrepairably damaged a lens without a filter, so I've used one ever since. It's true that if you use a cheap filter in front of a lens there will be some degredation of the image as well as some contrast loss and colour change, but anyone placing a £5 filter infront of a lens costing many hundreds of pounds would deserve problems. I have exhaustively tried to notice a difference between pictures taken with a filter against those taken without, you would need super eyesight to spot any difference, I certainly haven't noticed any. Hoya claim benefits of this filter over their less expensive Digital Pro UV filter which I have on other lenses and had on my previous Nikon 16-85 lens, I personally can't spot any difference, both are excellent, so whether it's worth paying a few pounds extra for this HD version, I doubt. This filter is ultra thin, it doesn't cause vignetting at all, it does have a scratch resistant and dirt repelling coating which is said to keep it cleaner, longer than the Pro Digital UV so that may be worth a few pounds extra. If you intend using a protective filter, or if you're new to DSLR photography I would strongly advise it, at least until you're used to handling the camera, a sticky thumb print on your new lens glass can be very upsetting, the Hoya UV filter is an excellent choice.