Sigma's compact Art-line normal prime for mirrorless — 45mm equiv on APS-C at f/2.8, pre-DN Art.
The Sigma 30mm f/2.8 EX DN was released approximately 2012 as a native mirrorless prime for the Micro Four Thirds system, designed for the short flange distances of mirrorless cameras rather than adapted from an SLR design. The DN designation indicates mirrorless-native design; EX was Sigma's premium line before the Art/Contemporary restructuring. MFT mount.
f/2.8 maximum aperture. 30mm focal length (approximately 60mm equivalent on MFT 2× crop). Seven elements in six groups. 46mm filter thread. At approximately 130g. Micro Four Thirds mount. Minimum focus 0.3m.
The DN suffix distinguished Sigma's mirrorless-native designs from adapted SLR optics at a time when mirrorless-native third-party primes were rare. The 30mm f/2.8 EX DN was among the first affordable, compact native MFT primes from a major third-party manufacturer. The 60mm equivalent provides a portrait-normal field of view on MFT cameras.
On the used market the Sigma 30mm f/2.8 EX DN MFT is an affordable compact prime for Micro Four Thirds cameras. Condition checks: MFT mount contacts, AF response, 46mm front element for marks, aperture blade smoothness. The Contemporary 30mm f/1.4 DC DN is the current successor with a faster aperture.