20mm F1.8 EX DG ASP RF

Highly Creative Lens
Landscape, Wedding & Events, Specialty
  • Fastest wide angle prime available on the market
  • Rear focusing system technology
  • Carrying case, lens hood, front & rear caps
ASP
ASPASPHERICAL

The aspherical lens complex allows freedom of design, improved performance, a reduced number of component lenses and a compact size.

DG
DGDG for Digital

Designed to deliver the ultimate in performance on full-frame digital SLRs, Sigma DG lenses also bring out the best in 35mm SLR film cameras and APS-C size DLSRs.

EX
EXEX Lens

The exterior of this lens is EX-finished to denote the superior build and optical quality, and to enhance its appearance.

RF
RFRear Focus

A rear focus system that prevents focus-dependent variation in aberration, making high-level image quality possible throughout the entire image. With their unchanging barrel length, these lenses also enhance balance and stability for the photographer.

#411
This product is discontinued.
*Authorized dealer prices may vary
Overview

This Sigma 20mm F1.8 EX DG Aspherical RF is a unique Sigma offering with an aperture of F1.8 making it the fastest super wide angle lens available from any camera or lens manufacturer. For the scenic or landscape photographer it’s important to have a wide angle lens with excellent optical performance and Sigma’s aspherical lens technology provides high quality images for the serious shooter. Sigma’s 20mm lens has a field of view of 94.5º and yet provides for a close focusing lens-to-subject distance of only 2.6 inches. Such performance parameters provide great creative freedom to the photographer who wishes to exploit its capabilities for juxtaposing very near subject with the surrounding background. This extreme wide angle view also makes this lens ideal for crating “stitched” panoramic scenes for dramatic effect. The architectural photographer will find this lens attractive for shooting building interiors and the photojournalists will find its fast speed a life saver in low light conditions.

Bahrain Fort Museum

Madaher Ebrahim

Sony A Mount 20mm F1.8 EX DG ASP RF 5 100

The back view of Bahrain fort Museum

Aurora Reflection

Rebecca Oprish

Nikon 20mm F1.8 EX DG ASP RF 8 sec. f/2.8 800

Aurora reflected off a lake. Taken in Palmer Alaska on October 22, 2013

Long exposure taken during a full moon

Ty O'Neil

Canon 20mm F1.8 EX DG ASP RF 30ec 5.6 2500

Long exposure taken during a full moon

Paris

Kurlin

Sigma 20mm F1.8 EX DG ASP RF 1/100 3.5 100

Incredible performance indoor with mixed light.

Thailand protester

Ty O'Neil

Canon 20mm F1.8 EX DG ASP RF 1/250 2.8f 100

In December 2013 political turmoil came to a head in Bangkok, Thailand. Protesters began taking goverment buildings one by one. This scene was during an attempt to over power a Police station. I used my 20mm prime Sigma to get in closer that any other journalist. It had to deal with teargas, chemical spray, water canons and everything else, and still delivered sharp, powerful, images

Cat's Eye View

Gerard Sabapathy

Nikon 20mm F1.8 EX DG ASP RF 1/400 f/10 100

There were some steps leading down to the cellar which afforded this ground level view. I wanted to capture a cat's eye view of the scene.

Country Music

Kevin Wixted

Canon 20mm F1.8 EX DG ASP RF 1/160 sec. 2.2 2500

A little country music out on the restaurant patio.

Fire

Gerard Sabapathy

Nikon 20mm F1.8 EX DG ASP RF 0.8s f/1.8 200

August 1st entertainment.

Lethbridge Via Duct

Dwayne Schnell

Nikon 20mm F1.8 EX DG ASP RF 1/50 f11 100

Love the view from the nature reserve right here, especially at golden hour :) What better to show off a wide lens than the longest/largest trestle train bridge of it's kind!!

Honda Element

Lee Lounsbury

Canon 20mm F1.8 EX DG ASP RF 1/320 5 400

Using the 20mm for an interesting of a friends Element. See more work at lounsburyphotoandvideo.weebly.com

Miami Nights

Jans de los Santos. JSDRIFTER Photography

Canon 20mm F1.8 EX DG ASP RF 1/250 1.8 100

Miami Night Photography skyline. The Miami that not meany people know.

Lavender

Gerard Sabapathy

Nikon 20mm F1.8 EX DG ASP RF 1/200 f/11 100

Lavender soaking up the sunshine.

Live.Love.Click

Live.Love.Click

Canon 20mm F1.8 EX DG ASP RF 1/125 1.8 1600

Wedding Day Mornings

Staghorn Cholla Cactus

Kevin Wixted

Canon 20mm F1.8 EX DG ASP RF 1/320 sec. 7.1 100

Staghorn Cholla cactus the morning after a rare Tucson snowstorm.

Married Couple

Riccardo Cigno

Canon 20mm F1.8 EX DG ASP RF 1/30 F8 1600

Married couple on a Fiat 500 Old type. (Abruzzo, Italy)

Wedding reception - Damion Edwards Photography

Canon 20mm F1.8 EX DG ASP RF 1/50 2.2 2000

shot during wedding reception

Sunset shoes - Damion Edwards Photography

Canon 20mm F1.8 EX DG ASP RF 1/640 1.8 100

My inspiration for this shot was the beautiful and soft light that existed during this sunset... These shoes worn by the bride had a very silky and watery look in the way they reflected light so I set them up so I could reflect the blues in the sky as the sea would.

guitar.jpg

Nikon 20mm F1.8 EX DG ASP RF 0.033 5.6 800

Jorge Chaine

Sony A Mount 20mm F1.8 EX DG ASP RF 1/125 8 400

Sandeep Murali

Nikon 20mm F1.8 EX DG ASP RF 30s f11 100

Andraz Blaznik

Canon 20mm F1.8 EX DG ASP RF 1/200 f/5.6 50

KEN JACKSON

20mm F1.8 EX DG ASP RF 1/4 f1.8 800

DEATH OF MY WIFE

Aan Kasman

Nikon 20mm F1.8 EX DG ASP RF 1/320s f/4 200

Human interest

larry Abellera...camera bug

Canon 20mm F1.8 EX DG ASP RF 1/80 f1.8 12,800

Traditional Dancing from Mexico

Ari Joseph

Nikon 20mm F1.8 EX DG ASP RF 1/160 f/1.8 800

Incredible lighting and atmosphere.

Damion Edwards Photography

Canon 20mm F1.8 EX DG ASP RF 1/50 2.2 2000

shot during wedding reception

Sandeep Murali

Nikon 20mm F1.8 EX DG ASP RF 4min f11 100

Bruce Percy

Peter Elfes

Canon 20mm F1.8 EX DG ASP RF 1min f16 100

I live near this spot and what the sunrise most mornings and never get tired of the color that nature throws at us. Sunny or stormy its always beautiful.

Damion Edwards Photography

Canon 20mm F1.8 EX DG ASP RF 1/40 4.5 1000

Beautiful Ixtapa sunsets

Al Fresco.JPG

Nikon 20mm F1.8 EX DG ASP RF 1/20 f/11 100

Seen in a back garden during a trip in the Vosges, France

Rusty.JPG

Canon 20mm F1.8 EX DG ASP RF 1/20 sec. 3.5 3200

Rusty, hand-held

New Submission

Canon 20mm F1.8 EX DG ASP RF 1/6 1.8f 400

Factory workers shovel material in to front loader. Heavy dust fills the factory.

New Submission

Canon 20mm F1.8 EX DG ASP RF 30ec 5.6 2500

Long exposure taken during a full moon

Lake Umayo. Puno PERÚ

Edgar Asencios Miranda

Canon 20mm F1.8 EX DG ASP RF 1/320 f/9.0 100

Lago Umayo en Puno-PERÚ En el circuito turístico de Sillustani.

Ironwood National Monument

Kevin Wixted

Canon 20mm F1.8 EX DG ASP RF various 11 100

After a long day of hiking in the desert

Ornament

STEVEN GRUEBER

Canon 20mm F1.8 EX DG ASP RF Auto f/1.8 Auto

Experimenting with extreme close focus coupled with wide angle. Very nice effects overall and great bokeh.

Pasadena Bridge Night photo

John Joulakian

Canon 20mm F1.8 EX DG ASP RF Bulp Mode Bulp Mode NA

Night Photo Bus on Bridge Bulb Mode

Autumn Night in The Yukon

G.Bawtinhimer

Nikon 20mm F1.8 EX DG ASP RF 8 seconds 1.4 1600

Driving on an isolated road in the Yukon enjoying the light show.

Panorama Foster Street at Colby Building

william powell

Nikon 20mm F1.8 EX DG ASP RF 1/250 F10 200

A stitched panorama made from 16 shots with the Sigma 20mm F1.8.

Kovalam Rocky Beach

Rithwik V J

Sigma 20mm F1.8 EX DG ASP RF 0.3 16 100

dp0 Quattro Compact Digital Camera

Seascape of Kovalam Rocky beach

Tech Specs

Lens Construction13 Elements in 11 Groups
Angle of View94.5º
Number of Diaphragm Blades9
Mininum Aperturef22
Minimum Focusing Distance20 cm / 7.9 in
Filter Size (mm)82
Maximum Magnifications1:4
Dimensions
(Diameter x Length)
88.5 x 87 mm/3.5 x 3.4 in
Weight520g / 18.3oz.
Corresponding Mounts
Sigma ASP
RF 
EX 
DG 
Nikon ASP
RF 
EX 
DG 
Canon ASP
RF 
EX 
DG 
Sony/Minolta ASP
RF 
EX 
DG 
Pentax ASP
RF 
EX 
DG 
ASP - Aspherical
RF - Rear Focus
EX - EX Lens
DG - DG for Digital
D - Distance Information Function

* Nikon Mount: NO built in motor lens: NOT compatible with D40, D40x, D60, D3000, D5000

* The appearance, specifications, and the like of the product are subject to change for improvement without notice.
 

Chart Guide

MTF CHART

LENS CONSTRUCTION

 
Ratings & Reviews
Write a Review

Write Your Own Review

How do you rate this product? *

Price
Value
Quality
Be the first to share your thoughts!
Resources
  • FOCAL LENGTH SIMULATOR

    The focal length changes the angle of view in an image. The longer the focal length, the smaller the angle of view and the greater the magnification.

    VIEW DETAILS

  • SIGMA LENS TECHNOLOGY

    Learn about the state of the art technology put into Sigma lenses to ensure high quality images.

    VIEW DETAILS

  • LENS TELECONVERTER COMPATIBILITY CHART

    Get more reach with what you have. Check the compatibility of your lens with the teleconverter chart.

    VIEW DETAILS

  • LENS CHART

    Need more information on a lens? Cross reference all the specs using the lens chart.

    VIEW DETAILS

  • LENS COMPATIBILITY CHART

    Check the compatibility of lenses with your camera make and model.

    VIEW DETAILS

  • LENS CHART FOR RECENTLY DISCONTINUED LENSES

    Get all the information you need on discontinued lenses.

    VIEW DETAILS

  • MTF CHART GUIDE

    See how a lens performed using the Modulation Transfer Function (MTF) Chart Guide. The MTF is just one criterion used to evaluate lens performance.

    VIEW DETAILS

Accessories

Accessories