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Sigma 20mm F1.8 EX DG Aspherical RF Super Wide Angle Lens0.25x - 20mm - f/2.8 - MPN: 411101 See Product Details
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Items In SLR Lenses You Might Be Interested InProduct Details of Sigma 20mm F1.8 EX DG Aspherical RF Super Wide Angle LensDescription This super wide angle lens is ensured minimal light-fall-off with superior peripheral brightness. The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus images in the foreground and background. This is an ideal DG lens optimized Digital SLR camera. The lens incorporates Dual-Focus mechanism. It is easy to hold the lens, since the focusing ring does not rotate during auto-focus, yet it provides adequate focusing torque of the focusing ring during manual focusing of the lens. Quick Glance Camera Mount: Canon EOS SLR Cameras Lens Type: Super Wide Angle Max Focal Length: 20 mm Max Aperture: f/ 2.8 Summary Product Title: Sigma 20mm F1.8 EX DG Aspherical RF Super Wide Angle Lens Manufacturer: Sigma Power Score: 4.1 | 4 Reviews Usage Information Compatible Camera Mount: Canon EOS SLR Cameras Lens Type: Super Wide Angle Optics Min Focal Length: 20 mm Max Focal Length: 20 mm Max Aperture: f/ 2.8 Min Focus Distance: 7.87" Filter Size Supported: 82 mm Physical Specifications Dimensions: 3.50 Diameter: 3.5 in Length: 3.4 in Weight: 1.15 lb Warranty Warranty Information: 1 Year Limited Warranty More Info URL: Manufacturer Link Additional Specifications Lens Construction: 13 Elements in 11 Groups Reviews on Sigma 20mm F1.8 EX DG Aspherical RF Super Wide Angle Lens
By member:
lordhypnos
- Nov 29, 2004
Sigma 20mm F1.8 EX DG Aspherical RF Super Wide Angle...Strengths: Fast f/1.8 aperature, quality build, sharp at f/1.8 and very sharp at f/2.8 and higher Weakness: Slow and noisy autofocus -- HSM would be much better, must flip switch and slide focusing collar to switch to/from manual focus, 82mm filter I bought this lens as a replacement for my Canon 20mm f/2.8 USM. The picture quality is on par if not better than the Canon, and the extra stop is a nice advantage. I wish that Sigma would have included HSM autofocusing, since the autofocus can be somewhat slow and noisy when compared to the Canon.
bestcovery.com - Dec 28, 2011
Best Canon Wide-angle Lens
Bestcovery experts have rated the Sigma Super Wide Angle 20mm f/1.8 EX Aspherical DG DF RF Autofocus Lens for Canon EOS as the Best Canon Wide-angle Lens. This product has also been rated as a best pick for the Best Canon Prime Lens. Bestcovery's experts recommend the best products and services for a particular need based on extensive research and evaluations. Click below to see Bestcovery's full... Top
productwiki.com - Sep 23, 2011
Sigma 20mm F1.8 EX DG ASP RF
The Sigma 20mm F1.8 EX DG ASP RF wide angle lens is designed for use with full frame digital cameras. Offering an aperture of F1.8, this Sigma is a staggeringly fast super wide angle lens, capable of taking photos in low light conditions. Its two aspherical glass elements correct distortion, and the lens offers a minimum focusing distance of 7.9 inches, allowing for close-up shots. ... PROS: (1)... TopAdvertisement  
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Sigma 20mm F1.8 EX DG Aspherical RF Super Wide Angle...
Strengths: Sharp, sharp, sharp. Distortion free on 1.3 crop and corners are sharp too.
Weakness: 1.8 is soft but still better than many zooms at f2.8.
I compared it with a Caon 24mm f /1.4L, and chose this over the Canon. The reason was that I could not tell which lens took which pic. In addition, while the USM of the Canon was quick and quiet, it hunted more than the Sigma. Lastly, the 20mm of the Sigma was more useful than the 24mm of the Canon (to me).