Sigma 24mm F1.4 DG HSM | Art (L-Mount)

The 24mm F1.4 DG HSM was one of Sigma's early Art primes, a DSLR design that Sigma later offered in L-Mount with a longer barrel (114.2mm, against 90.2mm for the SA-mount version). Three FLD and four SLD elements handle colour, and Sigma placed aspherical elements toward the rear to suppress sagittal coma flare for night skies and city lights.

The L-Mount version measures 85.4 x 114.2mm and weighs 755g, takes 77mm filters, and focuses to 25cm for a 1:5.3 ratio. Focus is driven by an HSM ring motor with full-time manual override; there is no aperture ring. Sigma now lists the L-Mount version as discontinued.