Sorry, folks. This seems to be my month for Internet screwups. Yesterday, I installed a new firewall at a different IP address than I had been using for this blog. But I didn’t install the SSL certificate on the firewall. So, after the DNS changes propagated, everybody started seeing scary warnings about the security of… [Read More]
Through-focus corner performance of the 20 mm f/1.8 Nikkor S
In the previous post, I put the 20 mm f/1.8 Nikkor S on a Z7, aimed it at an artificial star, and used the focus shift shooting (FSS) feature of the camera with a step size of 1 to move from front-focused to approximately in focus to back focused, and I composited them. In this… [Read More]
An apology
My whole website, including this blog, was out of service from about 10:00 PDT last night until 7:00 this morning. It was my fault. I wasn’t paying attention to the disk storage being used by backups and the site ran up against its disk storage limit. It didn’t fail gracefully; everything just came to a… [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]