Pentax smc DA 15 mm f/4 ED AL Limited review - Autofocus

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Pentax smc DA 15 mm f/4 ED AL Limited

16 August 2011

Arkadiusz Olech

10. Autofocus

Writing about an autofocus in a lens which, for a good measure, wouldn’t need an autofocus at all is a bit premature. In order not to sound groundless here are some concrete numbers. Even at the maximum relative aperture the focus set at 3 meters guarantees us a sharp image in the range from 1.5 meters to infinity. When we employ the f/5.6 aperture the situation becomes even better because setting the focus at 2 meters makes the depth stretch from 1 meter to infinity. Apart from that the lens features a clear distance scale which helps to chose the right settings of the MF ring.

Pentax smc DA 15 mm f/4 ED AL Limited - Autofocus

If you take the lens’s parameters into account it is really hard to speak about the accuracy of the autofocus or any front or back focus tendencies- there are simply no such problems. You should only know that the lens buzzes audibly – like all Limited series devices with a “screwdriver”. The speed should be praised, though – the focus is set really flash quick and running through the whole scale doesn’t even take 0.5 of a second.

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