Sigma presents two more Contemporary Premium lenses for mirrorless full-frame cameras with L-mount or Sony E-mount. The new 24mm F2 DG DN is particularly fast -- a 24mm F3.5 is already available in the series, after all -- and features an optical construction of 13 elements in 11 groups, including two SLD elements and an FLD lens to correct chromatic aberration. Weighing 365g and measuring 70mm×72mm, the lens is highly portable, while also being rugged thanks to its all-metal construction and dust and splash protection.
24mm F2 DG DN
The same goes for the portrait focal length 90mm F2.8 DG DN | Contemporary, which is also made of metal but weighs only 295g with dimensions of 64mm x 59.7mm. With a closest focusing distance of 50 cm and a maximum magnification of 1:5, macro photography is also possible.
In this optic, the optical design includes 11 elements in 10 groups, including five SLD lenses, again to reduce longitudinal chromatic aberration. According to Sigma, an asphere pressed bright with great precision should ensure high contrast transmission of the finest details in the focus zone as well as a beautiful bokeh without colored artifacts in the out-of-focus background.
90mm F2.8 DG DN
Both I-series fixed focal lengths use Super Multi-Layer Coating (SML), which reduces flare and ghosting. The aperture consists of 9 blades, and the aperture ring is manual. A stepper motor is used for fast focusing, which is supposed to work quietly according to the manufacturer. Auto focus with automatic eye detection used in newer mirrorless cameras is also supported.
The two new additions, Sigma 24mm F2 DG DN | Contemporary and 90mm F2.8 DG DN | Contemporary, will cost 619 euros each and should be available soon.