Nikon Nikkor Z MC 105 mm f/2.8 VR S
10. Autofocus and focus breathing
Autofocus
The autofocus of the Nikkor MC 2.8/105 was tested with the help of the Nikon Z7 camera and the performance of such a set was silent, with just a teeny whirr. Unfortunately it was also slow. In the FULL range running through the whole distance (and it is a big range indeed) and confirming the focus took typically over one second. It's a bit strange that the producer offered just two working ranges while the third range, designed for taking photos from greater distances, like, e.g. from 0.5 of a meter to infinity, would be more than advisable.The accuracy of the focusing mechanism should be praised for a change. We didn't observe here any significant problems either in our studio or outside.
We also didn't notice any front or back focus tendencies.
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| Nikon Z7, 105 mm, f/2.8 |
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Focus breathing
Focus breathing tests show reframing images as you oversharp them. We conduct the test by manually passing from the minimum focusing distance to infinity with the aperture stopped down; then we check how the field of view of the lens changed as a result.A frame change ranging from 0 to 5% we consider to be low. Between 5 and 10% you can speak about medium levels. Usually such values constitute also the maximum efficiency level of any breathing compensation algorithms, present in some bodies. Between 10 and 15% focus breathing is high, above 15% its level can be called very high.
The test video of the Nikkor lens is shown below:
In case of the tested lens even 'monstrous' doesn't cover the horribly high level of focus breathing. For its potential users it is a valuable piece of information – for distances other than astrophotographic the Nikkor Z 105 mm f/2.8 doesn't have much in common with either the 105 mm focal length or the f/2.8 aperture.
