Sigma 30mm f/1.4 EX DC HSM Lens for Canon Digital SLR Cameras

Designed to match the APS-C size image sensors of Canon digital SLR cameras, the Sigma 30mm f/1.4 lens is an ideal choice for a wide range of applications, including snapshots, portraiture, indoor shooting, and landscape photography. The 30mm lens relies on two special-low-dispersion glass elements and a glass-mold aspherical lens. Combined, the construction details correct for all types of chromatic and color aberrations. The lens is also equipped with a Hyper Sonic Motor (HSM) that supports quiet, high-speed autofocus, but also turns off should you prefer full-time manual focusing. Other features include a maximum aperture of f/1.4, a 62mm filter mount, and a one-year warranty.

Specifications

• Focal length: 30mm
• Maximum aperture: f/1.4
• Lens construction: 7 elements in 7 groups
• Angle of view: 45 degrees (SD format)
• Number of diaphragm blades: 8
• Minimum aperture: f/16
• Minimum focusing distance: 15.7 inches
• Maximum magnification: 1:10.4
• Filter size: 62mm
• Corresponding AF mounts: Canon
• Dimensions: 2.97 inches in diameter and 2.3 inches long
• Weight: 15.2 ounces
• Warranty: 1 year

List Price: $439.99
Amazon Price: Too low to display
Customer Review: So much potential; so little QC
I tried four copies; three were bad, one was awful. This lens has been very favorably reviewed, and I find their 50 f1.4 to be magnificent, so I took a chance. The only thing I can think, based on what I saw in the files, is that in each case, one or more of the elements was out of alignment, because they didn't produce a normally focused image at any focus distance. Something 10 feet away on one side would be in focus, and something fifty feet away on the other side would be. Very strange.
Customer Review: Yes virginia there is a focusing issue w/ this lens
When I bought this lens for my Canon 450D, I did not do enough research about the poor quality of Sigma lenses. My suggestion is to take a look at Canon's 28mm EF and 35mm lens as possible alternatives to this lens. Like other reviewers my instance of this lens tends to focus in front of the subject I want and not on the subject. Thus, resulting in an out of focus/fuzzy picture. I've been forced to manually focus this lens if I desire my subject to be in focus. This really reduces the number of photos I can take per given amount of time and the situations where I can use this lens.