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]
Archives for November 2017
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]
Nikon D850 AF-S accuracy
This is the sixth post in a series of Nikon D850 tests. The series starts here. I decided to do my downhill-with-a-tailwind test for autofocusing accuracy on the D850 with the Nikon 105 mm f/1.4 lens. This test uses a static flat, easy-to-focus-on target and bright light (in this case, f/1.4 at 1/800 seconds at ISO… [Read More]
Magical thinking and ISO choice
In a recent LuLa thread about the Nikon D850, in response to a remark of mine about the ISO where the camera changes conversion gain, a poster said: I’ve always been wary of using intermediate ISO settings. They didn’t seem to serve much purpose years ago when I was using Canon DSLRs. It was generally… [Read More]
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