Micro-Nikkor AF-S 105mm f/2.8G IF-ED VR - Review / Test Report - Analysis
Lens Reviews - Nikon / Nikkor (APS-C)

Distortion

The Micro-Nikkor shows a very low degree of barrel distortion (~0.18%) which is absolutely negligible in field conditions.

The chart above has a real-world size of about 120x80cm.

Vignetting

The AF-S 105mm VR is a full frame lens thus enjoying a sweet spot behavior on the D200. Nonetheless it still shows a moderate degree of vignetting at wide-open aperture. From f/4 and up the problem is negligible. Vignetting is no issue at very close focus distances.

MTF (resolution)

Two lenses have been tested - the 1st sample was already excellent in terms of resolution but the 2nd sample was even better. Typical for most macro lenses the resolution of the Micro-Nikkor is superb straight from the max. aperture setting combined with a pretty even quality between the center and the borders. In fact the Nikkor was able to set the new record for border resolution among the lenses tested to date. Beyond medium aperture settings diffraction is the limiting factor so better avoid very small apertures. This is a physical limitation and not a design issue.

Please note that the MTFs charts below represent the performance near infinity focus. For the time being macro performance tests are not possible.

Below is a simplified summary of the formal findings. The chart shows in line widths per picture height (LW/PH) which can be taken as a measure for sharpness. The chart is limited to the visually relevant LW/PH range of [750, 2250]. If you want to know more about the MTF50 figures you may check out the corresponding Imatest Explanations.

Chromatic Aberrations (CAs)

The first tested sample produced a very uneven and mediocre CA (color shadows at harsh contrast transitions) characteristic. The second sample performed much better and about in-line to what you can expect from such a high-performance lens. At large aperture settings CAs are very low and not really field relevant. However, the average CA width increases steadily towards smaller aperture setting with a peak around 1px at and beyond f/8. This is relatively high for a fix-focal. Please note that lateral CAs can be easily corrected via software tools.




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