Sigma X 30mm f/1.4

The Sigma 30mm f/1.4 in this cluster is a fast, short-tele prime offering a wide maximum aperture of f/1.4. The single focal length (30mm) indicates a fixed prime intended for low-light shooting, shallow depth-of-field portraits and attentive general-purpose use where subject separation and background blur are desirable. The cluster key lists AF and VXD which indicate the presence of an autofocus mechanism; VXD is Sigma's high-speed voice-coil-type linear motor designation on some modern designs and AF confirms autofocus capability. The tokens DC and DN appear in the cluster key alongside FF; these labels are Sigma-specific platform markers and therefore should be interpreted only as meta-tags rather than definitive format limitations without consulting the source pages. Because the aperture is listed as f/1.4 (same for both max and min tokens) the lens is designed to deliver maximum brightness typical of bright primes. This kind of lens is often chosen by photographers who prioritise subject isolation, creative depth-of-field control and better available-light performance than slower kit lenses. For full details on optical formulas, focusing behaviour and handling, consult the linked reviews and the Sigma product pages included in the sources.