Nikon Nikkor AF-S DX Micro 40 mm f/2.8G review - Autofocus

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Nikon Nikkor AF-S DX Micro 40 mm f/2.8G

7 November 2011

Arkadiusz Olech

10. Autofocus

The tested lens is equipped with an ultrasonic SWM motor so the work of focusing mechanism is noiseless. A SWM motor not always means a great speed of autofocus and the Nikkor 2.8/40 is a perfect example of that. It works slowly – running through the whole distance scale takes almost two seconds. Using the focus limiter helps but still you can hardly speak of impressing results because running through even that limited range takes about one second.

Fortunately the accuracy of the mechanism is beyond reproach. In studio conditions the number of autofocus misses reached just 3% which is a very good result.

When it comes to front or back focus tendency we can find a minimal level of the latter. It is not bothersome because its influence can be noticed only when you work close to 1:1 reproduction ratio, with the shallowest depth of field.

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