The is the fifth in a series of posts about the Voigtlander 65 mm f/2 Apo-Lanthar macro lens. The series starts here. We proved here that the Apo-Lanthar has a flat field for distant subjects. I received a request to look at field flatness at 1:2. It’s taken me several days to develop an alignment… [Read More]
Archives for September 27, 2017
Detectability of visual signals below the noise, part 2
A few days ago, I made this post about the visual detectability of information with a signal to noise ratio (SNR) of less than one. If you don’t remember it you should at least go back and skim it, or this post won’t make much sense to you. It occurs to me that the normalization… [Read More]