Sigma 30 mm f/2.8 EX DN
1. Introduction
The riddle was solved at the beginning of February 2012 when Sigma showed its new DP series compact cameras equipped with a Foveon sensor of the APS-C format. They are offered with 2.8/19 and 2.8/30 lenses. You can suspect Sigma wanted to hit two birds with one stone. As they’ve already produced lenses for their own compacts, ‘disconnecting’ them and equipping with other mounts was not such a big problem. The situation is not as simple as it seems at first glance, though. Although the basic parameters of mirrorless cameras’ lenses, offered in DP Sigma devices, are the same, they differ in other crucial aspects – e.g. the optical construction. It seems the Sigma optics constructors thought it would be easier to introduce some slight changes than to change the aperture or design an entirely new lens from scratch.
We would like to thank the Sigma ProCentrum company for borrowing the lens for testing purposes.
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You are also invited to get acquainted with our test procedure, described in the article "How do we test lenses?" If you feel it’s still not enough, please go to our FAQ section where you can find some further explanation.
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