Sigma EX 20mm f/1,8 DG ASP RF


Sigma EX 20mm f/1,8 DG ASP RF
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Sigma EX 20mm f/1,8 DG ASP RF
This is a prime lens manufactured by Sigma and the model was launched 2008.
The lens belongs to the category  wide angle prime lenses, a wide angle lens where you do not have the possibility to zoom in and out.
See all lenses released by Sigma
See all lenses that was released 2008
Read more about wide angle lenses
 
Compability, auto focus and focal length
The lens is available for both Canon and Nikon cameras, but there are two different versions of this lens (one for each brand and mount) so it is important that you ask for and choose the right version when bying the lens.
This lens is constructed to fit all models of Canon and Nikon cameras, regardless of camera model or type of sensor.
Here it is the only Canon version of the lens that has a built-in auto focus (AF) motor. The possibility to use auto focus (AF) is available for Nikon cameras but only if the camera itself has a built-in auto focus (AF) motor. Some cheaper and budget camera models from Nikon lacks a built-in auto focus motor, and we at Lensora appreciate auto focus, so in the list of compatible cameras we have chosen to display only the cameras that you can get autofocus with.
The lens has a focal length of 20 mm. Depending on which camera the lens is used, the experienced and perceived focal length will be different. Please visit the list of compatible cameras below, it will provide the equivalent focal length you get on each camera.
See compatible cameras and perceived/equivalent focal length
Read more about focal length and your field of view
Read more on the cameras impact on the perceived focal length
Read more about the auto focus motor and the importance of this part
 
Lens brightness and image stabilizer
The lens brightness and aperture value is f/1,8.
This aperture value indicates that the lens is extremely bright.  This will make it so much easier shooting in darker environments where you do not want or can use flash lighting, for example in churches or at different sports venues.
The lens lacks image stabilization, which otherwise os good for avoiding the blur that can occur when using slow shutter speeds. Since the lens is bright, with good aperture value, the lack of image stabilization might not be that big of a deal, although a image stabilizer is always an advantage to have.
Read more about the aperture and lens brightness
Read more about how an image stabilizer works
 
Filter and Lens Hood
The lens has a traditional filter thread on the front and its measuring 82 mm which also the filter you will use must have. If you use for example an UV filter can be a cheap insurance against scratches and dust.
If you buy this lens it will come with a lens hood, whose model name is "LH875-02 548".
Read more about filters
Read more about lens hoods
 
Pictures (product and sample images)
In order to see larger product images of the lens, click the link below.
Besides looking at product images it is also of interest to see pictures taken with this specific lens. This can give you a hint of what kind of images this lens can achieve, what the focal length will be like etc.
Images of Sigma EX 20mm f/1,8 DG ASP RF
Sample pictures taken with Sigma EX 20mm f/1,8 DG ASP RF
 
 
Things to consider before buying
Below you will find some summarized points and facts that can be considered as the 'pros and cons' of this lens. These are based entirely on the facts and values that are accessible through the lens specification, so we highly recommend that you also read the reported reviews available (see tab 'Reviews'); this in order to get a more complete view of the lens and its capabilites. Reviewer opinions reflect the lens, its use and its optical performance in a more accurate way, but any way - here a few different points to consider before buying this lens.
The lens brightness, f/1,8
Works on all sensor types
A lens hood is included
No built-in auto focus motor (the Nikon version)
The lens is not sealed against moisture and dust
Heavy (520 gr)
Specification
Product Name:Sigma EX 20mm f/1,8 DG ASP RF (See dictionary)
Release date: 2008
Manufacturer:Sigma
Type of lens: Wide Angle Lenses
Construction: Prime lens (no possibility to zoom)
Works with cameras from: Canon (see compatible cameras)
Nikon (see compatible cameras)
1:1 at Macro:
No Macro lens
Compability:
Works on all sensors (see compatible cameras)
Auto focus:
Yes
Built-in auto focus (AF) motor:
Canon
Nikon
Nikon; for auto focus the camera has to have a built-in auto focus (AF) motor
See a list of compatible cameras
Maximum aperture: f/1,8
Focal Length 20 mm
Depending on which camera this lens is used the focal length can seem different. This is because different camera sensors can have a slight crop factor and the focal length will be equivalent to:
  20 mmon Canon FF, Full frame
  26 mmon Canon APS-H
  32 mmon Canon APS-C
  20 mmon Nikon FX, Full frame
  30 mmon Nikon DX, APS-C
See list, camera for camera
Read more on the cameras impact on the perceived focal length
Lens Construction: 13 elements / 11 groups
Image Stabilizer:
No
Closest Focusing Distance:20 cm
Filter: Filter Thread, 82 mm
Lens Hood:
LH875-02 548(included)
Tripod mount:
No (Read more)
Weather sealing:
No
Dimensions (diameter x length):88 x 89 mm
Vikt:520 g (see the total weight, camera+lens)
Retail price (USD)670 USD
 
 
Product Page (Sigma):
Link to Sigma (product page)
Link to Sigma (product page)
Link to Sigma (product page)
 
Send in a product link Send in a product link
 
Text from Sigma:"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.

Designed for use with full frame digital cameras

May also be used with smaller APS-c size sensors

Two Aspherical glass elements offer correction for distortion

Minimum focusing distance of 7.9 inches allows close-up photography with a lens to subject distance of only 2.6 inches providing a magnification ratio of 1:4

Rear focus system eliminates front lens rotation & is suitable for use of Petal-type lens hood & polarizer filters

A lens hood, front/rear lens cap and carrying case are included with the lens."
 
Reviews
fotosidan.se (reviews by users)
 
fredmiranda.com
http://www.fredmiranda.com/reviews/showproduct.php?product=125&sort=7&cat=38&page=1
 
juzaphoto.com
http://juzaphoto.com/eng/articles/sigma_20_1-8_ex_dg_review.htm
 
juzaphoto.com
http://juzaphoto.com/eng/articles/canon_24_1-4_sigma_20_1-8.htm
 
shutterbug.com
http://shutterbug.com/equipmentreviews/lenses/0901sb_get/
 
slrlensreview.com
http://slrlensreview.com/web/sigma-slr-lenses-41/wide-angle-slr-lenses-71/150-sigma-20mm-f18-ex-dg-asph-rf-lens-review.html
 
the-digital-picture.com
http://the-digital-picture.com/Reviews/Sigma-20mm-F-1.8-EX-DG-Lens-Review.aspx
 
 
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Does this lens work with my camera?
Below you will find all registered cameras here on Lensora. Wether the actual camera works with this lens or not is displayed with a green or a red symbol, and if you want to know more about why the lens and the camera work or do not work together you click for further information..

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Nikon D1 Compatible More information
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Nikon D1X Compatible More information
Nikon D200 Compatible More information
Nikon D2H Compatible More information
Nikon D2Hs Compatible More information
Nikon D2X Compatible More information
Nikon D2Xs Compatible More information
Nikon D3 Compatible More information
Nikon D300 Compatible More information
Nikon D3000 Not compatible More information
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Nikon D3100 Not compatible More information
Nikon D3200 Not compatible More information
Nikon D3300 Not compatible More information
Nikon D3s Compatible More information
Nikon D3x Compatible More information
Nikon D4 Compatible More information
Nikon D40 Not compatible More information
Nikon D40x Not compatible More information
Nikon D4s Compatible More information
Nikon D50 Compatible More information
Nikon D5000 Not compatible More information
Nikon D5100 Not compatible More information
Nikon D5200 Not compatible More information
Nikon D5300 Not compatible More information
Nikon D60 Not compatible More information
Nikon D600 Compatible More information
Nikon D610 Compatible More information
Nikon D70 Compatible More information
Nikon D700 Compatible More information
Nikon D7000 Compatible More information
Nikon D70s Compatible More information
Nikon D7100 Compatible More information
Nikon D80 Compatible More information
Nikon D800 Compatible More information
Nikon D800e Compatible More information
Nikon D810 Compatible More information
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Nikon Df Compatible More information
Pictures (product and sample images)
In order to see larger product images of the lens, click the link below.
Besides looking at product images it is also of interest to see pictures taken with this specific lens. This can give you a hint of what kind of images this lens can achieve, what the focal length will be like etc.
Images of Sigma EX 20mm f/1,8 DG ASP RF
Sample pictures taken with Sigma EX 20mm f/1,8 DG ASP RF
Alternatives to Sigma EX 20mm f/1,8 DG ASP RF
For you with:
Canon
Canon EF 20mm f/2,8 USM
Canon EF 24mm f/1,4 L II USM
Canon EF 24mm f/2,8
Sigma EX 24mm f/1,8 DG ASP Macro
 
For you with:
Nikon
Nikon AF 20mm f/2,8 D
Nikon AF 28mm f/2,8 D
Sigma EX 24mm f/1,8 DG ASP Macro
Sigma EX 10-20mm f/3,5 DC HSM
 

 
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