Sigma 20mm F1.4 DG DN Art for L-Mount

Optical Design and Performance

• Full-frame Leica L-mount prime lens with ultrawide 20mm focal length.
• Large maximum aperture of f/1.4 ideal for low-light and astrophotography.
• Incorporates two Special Low Dispersion (SLD) elements and three aspherical elements to correct chromatic aberrations and distortion.
• Concave double-sided aspherical element ensures outstanding edge-to-edge sharpness.
• Super Multilayer Coating minimizes flare and ghosting, enhancing contrast and color neutrality.
• Optimized sagittal coma flare control for pinpoint stars across the frame, beneficial for astrophotography.

Mechanical and Functional Features

• Stepping motor (STM) driven inner focus system for fast, quiet autofocus operation.
• Manual Focus Lock (MFL) switch disables focus ring to prevent focus shift during long exposures.
• Aperture ring with click and lock switches to avoid accidental aperture changes.
• Rounded 11-blade diaphragm produces smooth, attractive bokeh.
• Durable brass bayonet mount ensures precise and reliable lens attachment.
• Petal-shaped lens hood reduces flare and protects the front element.

Filter and Accessory Compatibility

• 82mm front filter thread, a rare feature for ultrawide primes, allowing use of standard screw-in filters.
• Rear filter holder accommodates sheet-type filters for creative effects.
• Curved front lip designed to secure optional lens heaters.
• Compatible with optional UD-11 USB Dock for Leica L-mount lenses, enabling firmware updates and fine-tuning.

Usage and Applications

• Ideal for landscape, architecture, and astrophotography due to wide field of view and excellent optical control.
• Large aperture facilitates shooting in low-light environments and enables shallow depth of field techniques.
• Designed to maintain image quality from center to edges with minimal distortion and vignetting.
• Suitable for full-frame Leica L-mount mirrorless cameras and APS-C models (equivalent to 30mm focal length).