Note: this post has been extensively revised. I keep reading assertions like this one that was just posted here: When saving and opening a JPEG file many times in a row, compression will ruin your image. I knew from hanging around with some of the IBMers working on the original JPEG standard that recompressibility with no… [Read More]

A long time ago, I experimented with developing deep infrared images without demosaicing. I used some of my own images with a camera that had an antialiasing filter, and some the I got from Lloyd Chambers using a camera with no AA filter. I found very small improvements in the ones without the AA filter…. [Read More]

This is the thirteenth in a series of posts about the Nikon 70-200 mm f/2.8 S lens for Nikon Z cameras. The series starts here. In two previous posts, I did some quantitative comparisons of the Nikon 70-200 mm f/2.8 E and S lenses at 200 mm. Now I’ll do the same at 70 mm…. [Read More]

I’ve received a few messages asking why I haven’t posted in a while and am I all right? I am fine, but have had a scare, as you’ll see if you read on. My rate of posting slowed down at about the time the Covid-19 epidemic started to hit the US hard. That was driven… [Read More]