I used the Fujifilm XF 23mm f1.4 R LM WR on the X-S10 which has Fujifilm’s Intelligent Hybrid AF with up to 425 selectable AF points. This proved very fast and effective when the XF 23mm f1.4 R LM WR was mounted. The lens gets subjects in focus very quickly and quietly, even when the focus distance is close to the minimum (19cm). Consequently, there were very few occasions when I actually needed to switch the manual focus mode.
Further good news is that focus breathing is controlled well and there’s only a very slight change to the framing when the focus shifts from infinity to the closest point.
While the level of sharpness at the centre of the frame is very good, what’s really impressive is how well it is maintained into the corners of the frame at every aperture setting. I’d have no qualms about using the XF 23mm f1.4 R LM WR at any aperture.
As has become common, there’s a correction profile that’s applied automatically to Jpeg and raw files, but you can turn it off for the raw files when you’re processing them in software such as Adobe Camera Raw. Removing the profiles for the XF 23mm f1.4 R LM WR reveals that there’s slight barrel distortion, but if you allow the profile to do its job, straight lines look straight.
Even with the profile applied, you may spot some vignetting in images shot at f/1.4 , but it’s not dramatic and closing down the aperture to f/2.0 effectively eliminates it.
I spent quite a bit of time trying to capture images with flare with the XF 23mm f1.4 R LM WR and, despite removing the petal-shaped lens hood and shooting with bright sunlight falling across the front element, it was remarkably difficult to achieve. As you’d expect, you can get some flare if the sun or another light source is in the image, but even then, it’s usually not bad.
I haven’t been able to find any problematic chromatic aberration in the images I shot with the XF 23mm f1.4 R LM WR – and I shot a lot of images with backlit edges.
Generally, out of focus areas look good and thanks to the large maximum aperture, there’s plenty of scope to isolate a subject when using the XF 23mm f1.4 R LM WR, especially when it’s closest to the nearest focusing point of 19cm. The rounded, 9-blade aperture ensures that most small highlights are rendered circular with only a few having a cats-eye shape. There’s also some soap-bubble bokeh, where the highlights are brighter around the edges of the circle, but it’s not strong.