DA 12-24mm f/4 on Z-1p

Images

The "Wall" images didn't use a tripod. The "Target" images used a tripod and 2-second delay. None of them used a lenshood. No filters were used.

I used aperture priority and autofocus throughout.

Teleconverter Focal length Wall Target  
(None) 12 f/4 f/4 f/8  
(None) 15 f/4 f/4 f/8  
(None) 18 f/4 f/4 f/8  
(None) 20 f/4 f/4 f/8  
(None) 24 f/4 f/4 f/8  
1.4 (Kenko) 17 (12 on lens) f/5.6 (f/4 on camera) f/5.6 (f/4 on camera) f/11 (f/8 on camera)  
1.4 (Kenko) 21 (15 on lens) f/5.6 (f/4 on camera) f/5.6 (f/4 on camera) f/11 (f/8 on camera)  
1.4 (Kenko) 25 (18 on lens) f/5.6 (f/4 on camera) f/5.6 (f/4 on camera) f/11 (f/8 on camera)  
1.4 (Kenko) 28 (20 on lens) f/5.6 (f/4 on camera) f/5.6 (f/4 on camera) f/11 (f/8 on camera)  
1.4 (Kenko) 34 (24 on lens) f/5.6 (f/4 on camera) f/5.6 (f/4 on camera) f/11 (f/8 on camera)  

Discussion

This is one of my favourite lenses, giving good results especially in combination with Lightroom's lens profiles. (I would like to have a weather resistant and SDM version of it).

It vignettes badly at wide angles, but appears to be plausible at the longer focal lengths. The vignetting largely disappears when used with a teleconverter, but it looks rather soft in the corners. I suspect that even if it were initially usable in some circumstances, I would sooner or later replace it in order to get the quality I expect at wide angles.