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]
Nikon D850 read noise vs shutter speed
This is the fifth post in a series of Nikon D850 tests. The series starts here. I made a series of dark-field exposures at ISO 1000 at all the timed shutter speeds that the D850 supports, with LENR off. I measured the rms read noise in counts (data numbers, if you prefer) in a 400×400 pixel… [Read More]
Nikon D850, Sony a7RIII design goals
This is the fourth post in a series of Nikon D850 tests. The series starts here. In addition, you should be able to find all the posts about the camera in the Category List on the right sidebar, below the Articles widget. There’s a drop-down menu there that you can use to get to all the… [Read More]
- « Previous Page
- 1
- …
- 191
- 192
- 193
- 194
- 195
- …
- 561
- Next Page »