A week ago I posted some images of Fourier transforms of Siemens Star photographs, and some interesting discussion ensued. Jack Hogan, one of the participants, has written up a guest post showing an interpretation of these plots. I am grateful to Jack for taking the time to do this. Take it away, Jack: A few… [Read More]
Archives for September 2017
Lens screening pages added
I have been working through the development of a lens screening procedure for the last couple of months. For the past three days, I’ve been writing it up, and have posted it here. It’s far from complete, but it’s ready for a few people to try using it to test their own lenses. If you are… [Read More]
Fourier transforms of Sony 12-24 Siemens Star tests
This is a continuation of the development of a simple, relatively foolproof, astigmatism, field curvature, and field tilt test for lens screening. The first post is here. Warning: this is a nerdy little post. don’t know how to interpret it myself. Maybe some of you do. If the words Fourier transform mean little to you,… [Read More]
Tomato portraits
This week the tomatoes have been coming in big-time. The dryer is running 24/4, and we’re having tomatoes with every meal except breakfast. I made some pictures. I used the simplest lighting setup I thought would do well: a single Paul Buff Einstein aimed at a single 3’x6′ diffusing panel. No reflectors. No gobos. No soft boxes or… [Read More]