Here is a continuation of a visual test of the Fujifilm GF 35-70 using a low-contrast Siemens star target. In the previous post I showed you center crops. In this one we’ll look at corner crops.
Test conditions:
- Target distance 20 meters
- ISO 100
- Manual exposure, varying the f-stops
- Arca Swiss CA on RRS legs
- 2-second self timer
- AF-S, best of 3 images at each sequence.
- Developed in Lr 11.1 with default settings except for sharpening turned off and white balance.
- White balanced to the lower right gray background of the Imatest Siemens star
Usually, I use manual focusing for these tests, but I am sad to report that the response of the GFX 100S manual focus to twisting the focusing ring is so twitchy that manual focus in unreliable with this lens. I will see if I can fix that.
In the upper right corner at a bit over 200% magnification, at 35 mm focal length:
It’s amazing to me how sharp the corner is at f/5.6 with kit lens.
F/5.6 and f/8 are very good.
At 45mm focal length:
Virtually as good as at 35 mm, and still very credible performance at f/5.6 and f/8.
At 70mm:
There is a small loss in performance at 70mm.
Good show, Fuji.
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