Archives for 2017

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]

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]

This morning I dropped by the Hartnell College Gallery to see the installation for my exhibition, This Green Growing Land. It’s a wonderful space, and I’m happy to have the unexpected opportunity to show this work again, about 15 years after its first showing in the same space.    Here’s a shot with the lights on, which… [Read More]

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. I’m getting ready to wrap all these posts on lens screening up into a paper that describes an entire lens test procedure, but there are a few things… [Read More]

This is a continuation of this post: Off-axis aberration testing — Sony 12-24/4 on a7RII If you got here without reading the previous post, you should go back and do so now. Here is the full frame at 18 mm:   Here’s our magnified tight crop of the center, with the same pixel dimensions as before:… [Read More]