Sigma 20mm f1.4 DG DN Art Lens for Leica L

SigmaSKU: 085126414696

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Product Description

Sigma 20mm f1.4 DG DN Art Lens for Leica L

  • L-Mount Lens/Full Frame Format
  • Aperture Range: f1.4 to f16
  • Two SLD Elements
  • Three Aspherical Elements
  • Super Multilayer Coating
  • Stepping AF Motor, MFL Switch
  • Rounded 11-Blade Diaphragm
  • 82mm Front Filter Thread
  • Rear Filter Holder
  • Durable Brass Bayonet Mount

An ultrawide Leica L-mount prime, the Sigma 20mm f1.4 DG DN Art Lens offers incredible imaging performance from corner to corner, with a large maximum aperture that makes it ideal for use in low-light environments, particularly under dark skies where its new features are especially useful. Always an excellent choice for landscape and architecture, this lens is equipped with newly updated functions especially useful for astrophotographers.

Combining an optical design with in-camera corrections that keep distortion under control, this lens offers an extremely well-controlled sagittal coma flare that yields pin-point stars from edge to edge. Additionally, a new Manual Focus Lock (MFL) switch disables the focus ring, ensuring that focus never changes, even after hours of shooting under chilly, dark skies. The lens has also been developed to accept 82mm front filters, a rarity on ultrawide primes, and another unique feature that includes a rear filter holder, which accommodates sheet filters for various creative effects.

As part of the Art line within Sigma's Global Vision series, this lens is designed to achieve truly notable optical performance and is ideally suited for creative and artistic applications.

Prime wide-angle 20mm f/1.4 lens is designed for full-frame format Leica L-mount mirrorless cameras and can also be used with APS-C models where it provides a 30mm equivalent focal length.

Fast f/1.4 maximum aperture is well-suited for working in low-light conditions and provides greater control over the focus position when using shallow depth of field techniques.

Two SLD and three aspherical elements have been incorporated within the lens design to correct for chromatic aberrations throughout the entire focusing range and to ensure exceptional clarity and contrast. This optical design also helps to control distortion and limit vignetting.

Employs a concave double-sided aspherical element, which provides outstanding edge-to-edge sharpness and optical performance.

Optimized for astrophotography, the lens offers extremely well-controlled sagittal coma flare and limits ghosting.

A Super Multilayer Coating has been applied to lens elements to minimize lens flare while producing contrast-rich and colour-neutral imagery, even in backlit conditions.

The inner focus system powered by a precise STM stepping motor provides high-speed autofocus and near-silent operation.

Optimized for astrophotography, a new MFL (Manual Focus Lock) switch disables the focus ring, ensuring that focus never changes, even after hours of shooting under chilly, dark skies.

The aperture ring with a click switch and lock switch prevents accidental aperture changes.

A rounded eleven-blade diaphragm helps to produce an attractive out-of-focus quality.

A petal-shaped lens hood helps to reduce lens flare when working in strong lighting conditions and offers some protection to the front element of the lens.

82mm front filter threads and rear filter holder for sheet-type filters.

A curved lip at the front of the lens keeps an optional lens heater from slipping in front of the lens.

Brass bayonet mount for ensured precision and durability.

Compatible with optional UD-11 USB Dock for Leica L, which enables fine-tuning different lens characteristics and updating its firmware.
Lens construction
15 elements in 11 groups
Angle of view 94.5°
Number of diaphragm blades
9 (rounded diaphragm)
Minimum aperture F16
Minimum focusing distance 27.6cm
Maximum magnification ratio 1:7.1
Filter thread N/A
Dimensions (diameter x length)
ø90.7mm × 129.8mm
Weight 950g

Understanding: Aperture

Aperture is the opening in a camera lens that controls how much light enters the camera. It's measured in f-stops like f/2.8 or f/8. Lower f-stop numbers mean wider openings, letting in more light and creating a shallow depth of field (blurry background). Higher f-stop numbers mean smaller openings, letting in less light and creating a larger depth of field (more of the scene in focus). Aperture also affects the quality of out-of-focus areas in the image (bokeh).

Understanding: Lens Types

Different lenses have different purposes to achieve different styles of images, some popular ones include:
Prime Lens: Fixed focal length, sharp images, great for portraits and dark settings.
Zoom Lens: Variable focal length, versatile for different shots and everyday use..
Wide-Angle Lens: Captures wide scenes like landscapes.
Telephoto Lens: Magnifies distant subjects, ideal for sports & wildlife.
Macro Lens: Perfect for close-up photography of small subjects.
Fisheye Lens: Ultra-wide perspective, creates unique images.

Understanding: Lens Mounts

Different camera brands use different lens mounts, which are like connectors that attach lenses to camera bodies. Each mount is specific to a particular brand and camera series. For example, Canon uses the EF and RF mounts, Nikon uses the F mount, Sony uses the E mount for its mirrorless cameras. These mounts dictate which lenses are compatible with which cameras. Some brands offer adapters to use lenses from other systems, but it's essential to ensure compatibility for proper functionality and autofocus performance.

Understanding: Manual and Autofocus

Manual focus and autofocus are two ways to adjust the sharpness of a camera lens. With manual focus, you turn a ring on the lens to bring the subject into focus yourself, giving you full control over what appears sharp in the image. Autofocus, on the other hand, relies on the camera's built-in technology to automatically adjust the focus for you, usually by detecting contrast or phase differences in the scene. Autofocus can be convenient, especially for fast-moving subjects or when you need to capture a quick shot, whereas manual focus allows for precise adjustments and creative control over the final image.

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