As many of you know, I’ve been doing slit scans of plants, and I’ve been struggling with image artifacts due to subject motion. In the past few days I’ve been working on a Matlab program to deal with the artifacts and at the same time assemble several images into a complete, visually seamless composite. In… [Read More]

Yesterday’s experiments with the D810 dark-field noise, which showed that Nikon employs some low-pass filtering when long exposure noise reduction is turned on, made me wonder if there was any similar filtering at high ISO settings, a la the Sony a7S. I looked at one of the green channels of exposures made at ISO 64… [Read More]

Yesterday I reported on some of the processing the D810 does to raw files, apparently in an attempt to reduce noise. A few weeks ago, I published these curves which look at dark-field noise vs shutter speed with the in-camera long exposure noise reduction on and off. You will note that there is some processing… [Read More]

There has been some discussion on the web about long-exposure noise reduction in the Nikon D810 that occurs even when the menu setting for such process is set to off.  I have seen some indications of this kind of processing in my dark-field versus shutter speed tests. Now that I have a tool for analyzing… [Read More]