Sigma AF 20mm F1.4 DG DN | Art Lens (E-Mount)

£859.99 £716.66

Order Now - Usually delivered in 2-4 weeks

SKU: SA-414965 Categories: ,

Sigma AF 20mm F1.4 DG DN | Art Lens

Sigma AF 20mm F1.4 DG DN | Art Lens (414965). The SIGMA 20mm F1.4 DG DN | Art is a wide-angle, ultra-wide-aperture prime that is perfect for astrophotography. Available in L-Mount and Sony E-mount, it delivers outstanding Art-line optical quality and offers a range of advanced features. As well as being very well-suited to astro, the 20mmF1.4 is an ideal optic for landscapes, interiors and a range of other wide-angle applications.

Weighing in at just 635g, the lens is significantly lighter and more portable than Sigma’s existing 20mm F1.4,and introduces a number of important features including a manual aperture ring with de-click and lock functionality, a front filter thread and rear filter holder, a Lens Heater Retainer to hold a heat strip in position, and an all-new Manual Focus Lock switch to fully deactivate the focus ring.

The optical performance of the lens is exceptional, with ultra-sharp results across the entire frame even at F1.4, and very well controlled sagittal coma flare – essential for astrophotography. The bright aperture is perfect for night sky landscapes, as well as for hand-held low-light shooting and for achieving a shallow depth-of-field.

This superb image quality, compact form-factor and advanced feature-set, combined with a beautifully constructed body, make for a versatile, high-performance optic that will enable photographers to unleash their creative potential and start achieving wide-angle images with impact.

Key Features:

  • Outstanding optical performance
  • Advanced functionality for every shooting situation
  • Superb build quality with uncompromising attention to detail
  • Compatible with Lens Aberration Correction
  • Internal focus system
  • Support for DMF and AF+MF
  • Compatible with high-speed autofocus

Specification

Lens Construction

  • FLD glass
  • SLD glass
  • ASPHERICAL LENS

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

27.6 cm / 10.9 in.

Maximum Magnification Ratio

1:7.1

Dimensions (Diameter × Length)

  • SIGMA SA-Mount
    φ90.7mm × 129.8mm / φ3.6in. × 5.1in.
  • Sony E-Mount
    φ90.7mm × 155.8mm / φ3.6in. × 6.1in.
  • L-Mount
    φ90.7mm × 153.75mm / φ3.5in. × 6in.
  • *The length of a lens is measured from the filter surface to its mount.

Weight

  • SIGMA SA-Mount
    950g / 33.5oz.
  • Sony E-Mount
    1,015g / 35.8oz.
  • L-Mount
    1,035g / 36.5oz.

Edition Number

A015

Supplied Accessories

Case, Cover Lens Cap (LC907-01) supplied

Features

Minimized chromatic aberrations

This lens minimizes chromatic aberrations, a common issue in large-aperture ultra-wide-angle lenses. It features two FLD (“F” Low Dispersion) glass and five SLD (Special Low Dispersion) glass elements to minimize transverse chromatic aberration, which is mainly visible around the edge of the image. The optimized lens power distribution helps minimize axial chromatic aberration. As a result, this lens delivers high image quality in every situation without color smearing, and its rendering performance is consistently sharp with high contrast.

Minimized distortion

Distortion is a common issue in wide-angle lenses, and it is not possible to correct it simply by changing the aperture value. For this reason, a lens must be designed from the start to minimize this issue. By adjusting the incidence angle of light starting with the first lens element and incorporating optimally positioned aspherical glass elements, the SIGMA 20mm F1.4 DG HSM | Art lens minimizes distortion throughout the entire image.

Distortion

Exclusive low-dispersion glass

The degree to which light is refracted by glass depends on the light’s wavelength. This fact causes different colors of light to focus at slightly different points. The result is chromatic aberration, the color fringing that is particularly noticeable in telephoto lenses. Most chromatic aberration can be removed by combining a high-refractivity convex lens element with a low-refractivity concave element. Yet residual chromatic aberration known as “secondary spectrum” may still remain. To minimize this secondary spectrum, which can be a serious issue with conventional lenses, SIGMA lenses feature up to three types of exclusive low-dispersion glass offering superior performance: ELD (Extraordinary Low Dispersion), SLD (Special Low Dispersion) and FLD (“F” Low Dispersion). In particular, FLD glass offers ultra-low dispersion in combination with high transmittance and the anomalous dispersion characteristics of fluorite. Meticulous deployment of these types of exclusive low-dispersion glass and optimization of power distribution gives SIGMA lenses superlative image rendition undiminished by residual chromatic aberration

Flare and ghosting reduction

From an early stage in the lens design process, flare and ghosting have been measured to establish an optical design resistant to strong incident light sources such as backlighting. SIGMA’s Super Multi-Layer Coating reduces flare and ghosting to help photographers produce sharp and high contrast images even in backlit conditions.

Only logged in customers who have purchased this product may leave a review.

Reviews

There are no reviews yet.

Main Menu