I will begin a series of fun trials with adapted lenses for my Fujifilm GFX 50S II. The first is the very specialized TTArtisans 11mm f/2.8 Fisheye lens. Interesting little lens. Quite inexpensive. The lens is Leica M Mount, and adapted using a TTArtisan LM-GFX adapter.
First, the lens full frame. The vignette caused by the petal shaped hood is very pronounced. As is the heavy blue fringing on the edges.
But the center is rather sharp. At 11mm, the lens is very easy to focus via focus assist. We need to zoom in to tweak the focus to ensure critical sharpness. Not bad. Here is a 1204 pixel crop from near the center. Barrel distortion is obvious, this is a fisheye lens. Not super sharp, but not bad, especially if reduced in scale in PS.
Playing around with crops...in more or less 35mm mode, cropped in Photoshop:
And using the Photoshop Adaptive Wide Angle filter to correct for the field curvature, we get a somewhat corrected image but the barrel distortion is still very strong. Filter was set to the 11mm on a 0.8 crop factor.
No other correction is applied to any of the images. The sky is blown up, but pulling back on the Highlight slider on ACR will recover detail of the clouds without changing much on the building.
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