Originally posted by Jonathan Mac I have read that the Fujinon 16/2.8 actually has a 15mm field of view in the same way as the 23/2 is slightly wider at around 21 or 22mm. I can't confirm any of this of course. I have the 15mm and enjoy using it, though not too often as it's a bit of a speciality lens, so I expect that one day I'll buy the Fujinon as the widest lens I have for the X mount is only 18mm.
That's interesting about the field of view...
What's also interesting is that the Fujifilm lens relies on curvilinear distortion correction (although this happens behind the scenes). Perhaps that's where the field of view comes in... without distortion correction, it might be 15mm, but after correction it's effectively 16mm? Plus, I've seen reports and examples of poor flare performance, though I've no personal experience of the lens to confirm this. Both aspects are quite different than the DA15. Both lenses have advantages and disadvantages...