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Sigma 30mm f/1.4 EX DC HSM

Sigma 30mm f/1.4 EX DC Specifications
Frame Coverage APS-C
Lens Construction (groups) 7
Lens Construction (elements) 7
No. of Diaphragm Blades 8
Minimum Aperture 16
Closest Focusing Distance 0.4m (15.7")
Maximum Magnifcation 0.10x
Filter Diameter 62mm
Maximum Diameter x Length 75.5mm x 59mm (2.97" x 2.3")
Weight 430g (15.2oz)
Ken Rockwell
If you need a full f/1.4 in a normal focal length for a digital camera (normal for a digital SLR is 28mm, not 50mm), can work around some repeatable autofocus inaccuracy and want to spend about $400, this is your lens.
Digital Grin
Both lenses are pretty darned sharp wide open, considering that they are, well, wide open. For center sharpness, the Canon may have a slight edge at f/1.8, but either lens is admirably resolving details by f/2.8. Corner sharpness is a different story, with the 28mm turning in generally superior performance. Both lenses exhibit fairly soft corners wide open (although more than adequate, especially considering these lenses' primary use as available-light shooters).
The Sigma 30mm f/1.4 EX DC HSM Lens is somewhat soft wide open and steadily improves to quite sharp at f/2.8. Corner sharpness trails center sharpness by a stop or two. Bokeh from the 8-blade aperture is nice. Colors are decent. CA (Chromatic Aberration), though not absent, is well controlled.
If you want maximum sharpness or also want to use the lens on a full-frame camera, the Canon may be for you. If, like me, you want all the aperture you can get and won't notice an ever-so-slight loss in sharpness, the Sigma gets the nod.
The picture quality alone, putting all the acquired knowledge of digital capture from the last few years into a simply constructed lens will pay dividends for those of you who purchase this lens.
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