The Sigma 135mm F1.4 DG Art is a professional prime lens for full-frame mirrorless cameras, notable for its F1.4 maximum aperture, exceptionally smooth bokeh, and superior optical correction with FLD and SLD elements. Key features include a dual High-response Linear Actuator (HLA) focusing system for speed, a 13-blade circular aperture for perfect bokeh, dust and splash resistance, and a durable aluminum/magnesium alloy construction. Its specifications include an 18.2° angle of view, minimum focus distance of 1.1m, and a 105mm filter size. 

Key Features 

F1.4 Maximum Aperture:

Provides incredible background blur (bokeh) and excels in low-light conditions.

Spectacular Bokeh:

Creates a distinctive depth of field, separating the subject from the background for impactful portraits.

High-Level Optical Correction:

Uses four FLD elements and other low-dispersion glass to minimize chromatic aberrations and maintain outstanding sharpness.

Fast & Quiet Autofocus:

A dual High-response Linear Actuator (HLA) system provides quick and precise autofocus.

Dust and Splash Resistant:

A robust, professional-grade construction featuring a hydrophobic front element coating offers protection in various environments.

Durable Build:

Made from aluminum, magnesium, and Thermosetting Plastic (TSC), ensuring reliability for intensive use.

Specifications 

Lens Type: Full-Frame (DG) prime lens for mirrorless cameras.

Focal Length: 135mm.

Maximum Aperture: F1.4.

Minimum Aperture: F16.

Lens Construction: 17 elements in 13 groups.

Angle of View: 18.2°.

Minimum Focusing Distance: 1.1m (3.61 ft).

Maximum Magnification Ratio: 1:6.9.

Filter Size: 105mm.

Weight: Approximately 1,430g (50.4 oz) for the L-Mount version.

Mounts Available: L-Mount and Sony E-Mount.