^I'm lazy, so I just took this from the trip report I'm currently writing:
That said, anyone who suggests buying a non-full frame ultra-wide angle lens for Disney that is not the Tokina 11-16mm f/2.8 is flat out wrong. Unquestionably, unequivocally wrong. I’ve heard that you won’t need the f/2.8 when you’re using a UWA lens. That’s wrong. I’ve heard that you’re better off having the 16-24mm than the 11-12mm. That’s wrong. Heck, I’ve heard all sorts of things. All wrong (well, besides the things saying to get this lens). The Tokina 11-16 is the perfect UWA lens. At f/2.8 it’s a viable lens to use for some cool shots on dark rides. Try those with a f/4 UWA. I think this will be especially true as cameras continue to advance high-ISO-wise, making those f/1.4-8 lenses less necessary. Similar to John, the father from the Carousel of Progress, I predict a day when wide angle lenses are used just as frequently as primes on dark rides, and a day when floating cameras that you telecommunicate settings to is possible–okay, maybe not the latter, but definitely the former, so why not get that type of UWA lens today?
As for the second aspect, whenever I used my UWA, I seemed to be using it on 11mm. If it had a 10mm, I probably would’ve used it on that. It could’ve been a prime for all I cared. I will gladly take that extra 1mm on the wide end and sacrifice the 8mm on the other end. I have other lenses that are duplicative of the longer end, I don’t have any others that can do the 11mm. Plus, although I don’t pretend to understand optical science, I’m sure the image quality is better as a result of the smaller focal range. Below are some images taken with the 11-16 that wouldn’t have been possible with, say, the Nikon 12-24 f/4 (which I am now very glad that I sold). As with most opinions, your mileage may vary. However, if it varies too far from my conclusions, it probably is wrong.