One of the things I was curious about with the new 10-24mm DX lens was whether it would lose one of the features that kept the 12-24mm in my FX bag: a big enough image circle to let the lens be used as an 18-24mm lens on my FX bodies. Well, surprise, the 10-24mm seems to cover the FX frame at somewhere just under 15mm. That's right, this DX lens might actually be the 14-24mm FX lens that accepts filters! Of course, I don't expect the same edge performance...