This is the tenth post in a series of Nikon D850 tests. The series starts here. The D850 has a feature that will allow the camera to do automatic focus bracketing with AF lenses. You focus the camera to the minimum distance that you want, tell it how many steps and the (not absolute) distance between… [Read More]
Archives for 2017
More on Nikon D850 PDAF with the 105/1.4
This is the ninth post in a series of Nikon D850 tests. The series starts here. In this post, I reported on the autofocus accuracy of the Nikon D850 using both contrast-detection (CDAF) and phase detection (PDAF). As Horshack pointed out, in AF-S mode with PDAF, the camera does not refocus if it likes the phase… [Read More]
Nikon D850 FFD
This is the eighth post in a series of Nikon D850 tests. The series starts here. At least one person has complained that their Nikon D850s have the wrong flange focal distance, so that the lenses think they are a different distance from the sensor than they really are. This can be a serious problem for… [Read More]
Nikon 105/1.4 on D850 — LoCA & focus shift
This is the seventh post in a series of Nikon D850 tests. The series starts here. Actually, this isn’t really a D850 test. It’s a test of a Nikon 105 mm f/1.4 lens that happens to be mounted to a D850. The performance of the combination is what I’m testing. We saw some anomalies in the D850… [Read More]
Assumptions behind slanted edge testing
I do a lot of slanted edge MTF testing. It’s a very powerful technique. I use Imatest, MTFMapper, and occasionally Peter Burns’ Matlab code. Recently, on DPR, Frans van den Bergh posted a list of the assumptions behind the method. If you are interested in that technology, it’s worth a read. If not, this is going to… [Read More]
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