Conclusion

The GF 23mm f4 R LM WR is another high-quality lens for Fujifilm's medium-format system. If you don't need to go quite so wide, then the 32-64mm zoom is a more logical choice, otherwise the GF 23mm is a no-brainer for landscape and architecture photographers.

The GF 23mm f4 R LM WR is a tack-sharp lens throughout the entire aperture range and at both the centre and edges of the image. It exhibits almost no chromatic aberrations, has negligible distortion given it's wide angle nature, and is capable of producing some surprisingly nice bokeh despite being a wide-angle lens and only having an f/4 maximum aperture. Vignetting at f/4 is the only real optical issue of note, although stopping down to f/8 solves the problem altogether. 

The high-speed linear AF motor makes this lens fast to focus, and build quality is once again excellent, with the traditional aperture ring being very welcome. Manual focusing is a veritable pleasure thanks to the massive, well-damped focusing ring and the on-camera focusing aids.

The ultra-wide-angle view of this lens means that it won't appeal to everyone, but in conjunction with the GFX 50S camera, it's capable of delivering some truly stunning images that will more than please anyone with an interest in landscape and architecture photography.

Ratings (out of 5)
Design	4.5
Features	4
Ease-of-use	4.5
Image quality	4.5
Value for money	4