SIGMA 20mm f/2 DG DN Contemporary L-Mount

SERIES I  - "PREMIUM COMPACT PRIMES" FOR MIRRORLESS USERS
The SIGMA I series features full-frame-compatible lenses that offer new value to mirrorless systems.
The combination of excellent optical performance with a level of compactness perfectly suited to smaller, lighter modern mirrorless cameras will bring new opportunities for a perfect shot.
SIGMA's excellence in development and production technologies has been built since our founding in 1961 and has become increasingly sophisticated with the introduction of the SIGMA Global Vision brand in 2012.
With this as a basis, SIGMA has been thinking carefully about the quality of the products, the feeling of wearing it, and the pleasure of owning it.
Thus was born the I series.

NEW OPTICAL PERFORMANCE STANDARDS FOR THE COMTEMPORARY LINE
The 20mm f/2 DG DN achieves the highest level of optical performance, even at the widest aperture setting of f/2, from the centre of the image to the periphery.
Based on the latest optical design technology, the lens construction includes three high-precision glass-molded aspherical lens elements, one SLD element, and one FLD element to suppress a variety of optical aberrations.
The result is clear, crisp images even in the extreme corners of the frame.
By focusing on the suppression of sagittal coma enlargement, which is difficult to correct in post-processing, accurate reproduction of very bright points of light was achieved.
This also provides extremely detailed results throughout the image, which is especially important for night sky photography.

The optical design of the lens, as well as Super Multi-Layer Coating and Nano Porous Coating (NPC), ensure minimal flare and ghosting, even when shooting in bright light sources.
This makes it much easier to shoot backlit subjects and still get strong, high-contrast results.

USE OF VARIOUS HIGH-PRECISION ASPHERICAL GLASS MOLDED LENSES
The surface of molds for glass molding, which is a process that forms optical components by pressing glass materials at high temperatures, requires very high precision. 
SIGMA uses high-precision molds whose surfaces are controlled with an accuracy of ±5 nanometers (0.000005 mm) or smaller. 
High-precision aspherical glass molded lenses file both good aberration correction and a compact lens size.

SIGMA'S UNIQUE COATING TECHNOLOGY NO POROUS COATING 
The super multi-layer coating is combined with SIGMA's unique coating technology "NPC (Nano Porous Coating)". 
The lens is designed to be less susceptible to strong incident light, such as backlight.
NPC (Nano Porous Coating) incorporates porous silica as a coating material. 
The porous silica layer has nano-sized holes with air inside. 
Having holes of this size allows for a large reduction in refractive index, allowing reflectance to be lower than conventional anti-reflective coatings. 
As a result, the reflected light that causes flare and ghosting is drastically reduced, achieving sharp image quality.

MAGNETIC METAL LENS CAP
The I-series  lenses are accompanied by a dedicated magnetic metal lens cap in addition to a regular plastic cap. 
This dedicated metal cap attaches to the front surface of the lens magnetically. 
It's no exaggeration to say that this meticulously crafted lid represents the finishing touch to the   I-series .

Box Contents: 
1x SIGMA 20mm f/2 DG DN Contemporary
1x Magnetic Metal Lens Cap LCF62-01M
1X Petal Type Lens Hood (LH656-03)