Archives for November 2017

This is the 19th post in a series of Nikon D850 tests. The series starts here. The Focus Shift Shooting feature of the D850 looks to be a boon to those wanting to achieve improved depth of field (DOF) through focus stacking. However, the minimum step size is marginally too large for that. Another possible use… [Read More]

This is the 18th post in a series of Nikon D850 tests. The series starts here. I had a question regarding whether the focus shift shooting feature on the Nikon D850 worked with the Sigma Art lenses, which have the reverse rotation direction of the focusing ring from F-mount (and any Nikon mount, as far as I… [Read More]

This is the 17th post in a series of Nikon D850 tests. The series starts here. Horshack has made an argument that if there’s bias to a PDAF system (as far as I know, CDAF systems don’t have biases), that can make the focus variations look larger when compared to a system where the average of… [Read More]

This is the 16th post in a series of Nikon D850 tests. The series starts here. [Horshack asked some questions about this post that caused me to go back and look at the EXIF data for the captures. When I did that, I realized that I’d gotten the sign of the PDAF bias settings wrong. I’ve… [Read More]

This is the 15th post in a series of Nikon D850 tests. The series starts here. As a follow-up to the CDAF images in the previous post, I made a series of phase-detection autofocus (PDAF) images of my three-level target. The target uses a pattern devised by Horshack at the central AF point, which should give… [Read More]