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]
Visuals of GFX 100 strobe profile differences
In the previous post, I discussed how I created some color profiles for the Fujifilm GFX 100 using strobe lighting and ColorChecker 24-patch (CC24) and 140-patch (CCSG) targets. I showed you numbers and graphs that analyzed the accuracy of each profile. In this post, I’ll show you some images. All come from the DPR Studio… [Read More]
Designing color profiles for strobe lighting
I haven’t posted in the last few days. That’s not because I was taking time off from photo tech. It’s because I’ve been beavering away on how to measure and design color profiles. I’ve built more than 50 of them, learned a lot, found a few dead ends, and am finally reading to report my… [Read More]
CC24 vs CCSG CIELab values
The last two posts have been about my experiences using the X-Rite CC24 and CCSG targets and X-Rite’s Color Checker Camera Calibration program with both diffuse and direct solar illumination. I found anomalies between the two targets, which I thought might be related to lighting and glare. But today I discovered that, even with the… [Read More]
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