Sigma's outstanding budget fast prime for Sony APS-C — f/1.4 at 45mm equivalent with stepping motor AF.
The Sigma 30mm f/1.4 DC DN Contemporary is a native APS-C prime for Sony E-mount and MFT bodies, providing a 45mm full-frame equivalent perspective at f/1.4. Released in 2016 as part of Sigma's Contemporary series, the DC DN designation confirms APS-C sensor design (DC) and mirrorless-native optical formula (DN). At 265g and 52mm filter thread it is compact for an f/1.4 APS-C prime. Nine rounded aperture blades.
The optical design uses 9 elements in 7 groups. Nine rounded aperture blades produce smooth bokeh. The 52mm filter thread is compact for an f/1.4 prime. At 265g the lens is lightweight. Minimum focus distance of 0.3m. Stepper motor AF. f/1.4 maximum aperture. DC confirms APS-C image circle; DN confirms mirrorless-native optical design. Available in Sony E and MFT versions.
The 45mm equivalent at f/1.4 covers the near-standard perspective for street photography, documentary, and available-light environmental portraiture. At f/1.4 on APS-C, subject isolation at typical street distances is pronounced. The DC DN mirrorless-native formula is optimised for the short flange distance of Sony E-mount, unlike the earlier DC HSM DSLR formula which required adaptation for mirrorless.
On the used market the Sigma 30mm f/1.4 DC DN Contemporary is affordable for an f/1.4 APS-C prime. Condition checks: stepper motor AF response, 52mm front element for marks, and aperture ring click consistency. Confirm the Sony E version is specified — an MFT version is also available. Compatible with Sony APS-C E-mount bodies; will activate APS-C crop on full-frame FE bodies.