New Sigma I Series Lenses Combine High Performance And Compact Designs

SIGMA IS ADDING to its existing system of DG DN lenses for full-frame mirrorless systems with a brand new line of compact premium primes called the I series. These lenses – as with all Sigma optical products, made in Japan – are designed to complement the more compact and lightweight full-frame mirrorless camera bodies.

There are three new I series lenses – a 24mm f/3.5, a 35mm f/2.0 and a 65mm f/2.0. They join the existing 45mm f/2.8 prime which is now part of the I series, and all four are designated ‘Contemporary’ in Sigma’s organisation of its lens lines. The Contemporary line features compact designs with the latest technologies and superior optical performance.

All the I series lenses feature durable metal barrel constructions – similar in standard to Sigma’s heavy-duty cine lenses – with weather sealing. The focusing rings, aperture collars and lens hoods feature a knurled finish for enhanced grip, and special finishes are applied to the exteriors to create a luxurious look and texture. The provision of an aperture collar is designed to enhance useability and they’ve been engineered to give a precise definite action. The optical designs make the most of the size reductions and performance enhancements that are possible thanks to the shorter flange distance of mirrorless cameras compared to DSLRs. Optical performance is also optimised through the use of the latest design and manufacturing techniques for aspherical lenses. Autofocusing is performed via stepper motors to ensure fast, smooth and near-silent operation.

The new 24mm, 35mm and 65mm I series lenses have magnetic lens caps that clip on and unclip very easily, and stay securely fitted.