Roger Cicala has come up with a quick and dirty focus curvature test that I’ve used before. Just make a photograph of a flat textured surface at an angle well away from the image field focus plane, then bring it into Photoshop and invoke Filter>Stylize>Find Edges. It works great at long and near-normal focal lengths:… [Read More]
Archives for March 2020
Chromaticity shifts with the a7RIV, Z7, and GFX 100
Yesterday, I reported on test shots of both the Macbeth Colorchecker 24-patch target (the CC24), and the Colorchecker SG 140-patch target (CCSG), made with the following setup: Sony a7RIV, Nikon Z7, Fujifilm GFX 100 Zony 55, Nikon 24-70/2.8 Z-mount lens, Fuji 120 mm f/4 macro Godox/Flashpoint AD600 Pro strobes, set to 1/64 power. 12-inch reflectors… [Read More]
Camera differences in color profile making
I made test shots of both the Macbeth Colorchecker 24-patch target (the CC24), and the Colorchecker SG 140-patch target (CCSG). I used the following setup: Sony a7RIV, Nikon Z7, Fujifilm GFX 100 Zony 55, Nikon 24-70/2.8 Z-mount lens, Fuji 120 mm f/4 macro Godox/Flashpoint AD600 Pro strobes, set to 1/64 power. 12-inch reflectors 45-degree strobe… [Read More]
Sony 20/1.8 vs Loxia 21/2.8 — Siemens Star
It’s natural to compare the new-kid-on-the-block Sony 20mm f/1.8 to the excellent Zeiss Loxia 21 mm f/2.8. Here’s a test with both lenses mounted on an a7RIV aimed at a low-contrast Siemens Star at about 8 meters, with the star in the center and the lower left corner. I used AF-S for the Sony, and… [Read More]
Sony 20mm f/1.8 G initial tests
I just received a copy of the new Sony 20 mm f/1.8 G lens. I’ve ordered the similar Nikkor S. I’ll be testing both of them, separately and together. FOr those of you who’ve been following the color profiling work, don’t worry; I’ll be doing both types of testing at the same time. Just don’t… [Read More]