So why a zoom, and why 2.8? Given the sort of shots they're almost always used for, does anybody really use UWs at their long end? And does anybody really need them to be 2.8? In my DSLR days I used the (lovely) Sigma 10-20 f/4-5.6. But shot almost everything around 10mm and f/8. And I think most people I know who use UWs do pretty much the same. So, why not develop a nice, compact 10mm f/4?
The needs of the working pro differ from the needs of the enthusiast.
Since my photography is almost 100% professional as I have other hobbies I spend my time at .... I can comment that I use the 10-24/F4 a lot when shooting a wedding ceremony to fly between the ultra wide angle for the entire scene and then back to fully zoomed in for the candid shots as I walk around perimeter of the ceremony. I also use that lens a lot for the first dances at the reception to get the awesome ultra wide angle of the decorations and guests as they have their first dance, then I zoom in all the way to get a waste-up shot of them with a little of the background.
When I shot Nikon I had the same lens but it was F2.8. I noticed the extra stop loss of F4 when I got the Fuji during the darker dance times. To try to keep the background similar, I had to now go higher ISO or slower shutter speed (would prefer the slower shutter speed) ... it depends on the scenario. But for the most part, it made no difference for the ceremony's having to go F4. But that zoom range is very handy to have when doing closer, more intimate photojournalism style of work.
Edited by Adam Woodhouse, 27 February 2017 - 02:42 PM.
TWO Fujifilm X-T2's + ONE X-Pro1
16mm/1.4 | 35mm/1.4 | 10-24mm/4 | 16-55mm/2.8 | 50-140/2.8
Flashes: Fujifilm EF-X500, iNissin i40 and two Yongnou 565's
Classic Lens Adapters: M42, Canon FD, Nikon and Minolta MD