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You are here: Home / GFX 100S / Fuji 20-35 f/4 landscape field curvature at 20mm

Fuji 20-35 f/4 landscape field curvature at 20mm

October 5, 2022 JimK 3 Comments

In the last couple of posts, I reported on significant field curvature with the Fujifilm 20-35mm f/4 GF lens. The purpose of this post is to see how that field curvature affects landscape images in landscape orientation. In this post, I’ll report on how the lens did at 20 mm focal length. In the two posts after this, I’ll examine the performance at 28mm and 35mm.

I started with a tree 100 meters away in the center of the image.

GFX 100S, 20-35 GF, 20mm, center, f/4

I panned the camera so that the tree fell on the right side near the edge. I made pictures focusing in the center, and refocusing when the tree was at the edge, and also without refocusing from the point where the tree was sharpest in the center. I made two sets of images, and picked the sharpest ones. The Fuji manual focusing at high magnification with peaking is good enough that both sets of images were about the same sharpness.

I used the side instead of the corner a) because it was easier,  and b0 because I thought it was more realistic for landscape photography, where the subject distance at the corners of the image is usually not the same as to the center.

Details:

  • GFX 100S
  • 20-35 GF
  • 2-second self timer
  • ISO 100
  • Manual focus
  • Low red peaking
  • Maximum magnification
  • RRS legs, C1 head
  • Developed in Lr CC with defaults except for
  • Adobe Standard Profile
  • Sharpening amount 20, radius 1, detail 25
  • Daylight color balance

Here are some crops at about 250% magnification.

GFX 100S, 20-35 GF, 20mm, center, f/4

 

GFX 100S, 20-35 GF, 20mm, side, f/4n not refocused

 

GFX 100S, 20-35 GF, 20mm, side, refocused, f/4

The refocused side image is sharper, but still softer than the center by a lot.

GFX 100S, 20-35 GF, 20mm, center, f/5.6

 

GFX 100S, 20-35 GF, 20mm, side, f/5.6 not refocused

 

 

GFX 100S, 20-35 GF, 20mm, side, refocused, f/5.6

The refocused side image is sharper, but still softer than the center.

GFX 100S, 20-35 GF, 20mm, center, f/8

 

GFX 100S, 20-35 GF, 20mm, side, f/8, not refocused

 

GFX 100S, 20-35 GF, 20mm, side, refocused,, f/8

The two images are much closer in sharpness.

GFX 100S, 20-35 GF, 20mm, center, f/11

 

GFX 100S, 20-35 GF, 20mm, side, f/11, not refocused

 

GFX 100S, 20-35 GF, 20mm, side, refocused, f/11

These are similar, and are definitely softened by diffraction.

It looks like f/8 is the way to go for distant landscapes.

 

 

 

 

GFX 100S

← FujiFilm 20-35mm f/4 GF on GFX 100S — field curvature Fuji 20-35 f/4 landscape field curvature at 28mm →

Comments

  1. TROY HOUSE says

    October 5, 2022 at 12:05 pm

    Please compare with the 23mm at 23mm if you could at some point
    thank you and love your blog

    Reply
    • JimK says

      October 5, 2022 at 12:24 pm

      I will do that comparison.

      Reply
      • Alex says

        October 5, 2022 at 1:22 pm

        That would be great. Thank you!

        Reply

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