I love my Nikon 14-24mm lens but it has one drawback; you can’t put filters on it. Not that one needs to use a huge selection of filters on ultra-wides but if you’re doing certain kinds of photography being able to use an ultra-wide combined with ND filters makes the composition or time lapse more interesting. Lee filters, the company that makes really cool kind of pricey large resin filters, has developed a holder for the 14-24mm lens and it’s equivalent in the Canon world. The downside of this is, the basic holder is $200 which needs a lens adapter, for another $100, to which you add the actual filter, around $150. So what you have is a filter and a holder that costs about a third as much as the lens to begin with, $450.