Does the Sigma 17 50 have chromatic aberration?
Chromatic Aberration. The Sigma 17-50mm ƒ/2.8 produces CA of the magenta-green variety, noticeable in areas of high contrast, and predominantly in the extreme corners. It’s mostly significant when the lens is used wide open, though zooming in does appear to limit its presence.
What is the construction of the Sigma 17-50mm lens?
The Sigma 17-50mm ƒ/2.8 OS features an all-black, all-plastic construction; parts of the lens are coated with Sigma’s rubberized coating, which offers good traction. There are two switches on the lens, one to activate or deactivate image stabilization, and one to enable or disable autofocusing.
Does the Sigma 17-50mm lose resolution when stopped down to f22?
At f/22, the Sigma 17-50mm does seem to lose a bit of resolution, but this is also to be expected to some extent when a lens is stopped all the way down to its smallest aperture.
Does the Sigma 17-50mm have zoom creep?
There’s no evidence of zoom creep, but Sigma does include a zoom lock to fix the lens at 17mm so the lens will not extend while dangling on your neck strap. The Sigma 17-50mm f/2.8 OS employs Sigma’s optical stabilization.
What is the Sigma 17-50mm HSM?
Navigate Review Jump to review page… Announced in February 2010, the Sigma 17-50mm ƒ/2.8 EX DC OS HSM provides third-party competition in the short zoom lens market. This is the first zoom lens produced by Sigma in this range that provides both a fixed maximum aperture and optical image stabilization.
Why choose the Sigma 17-50 OS over other kit lenses?
The Sigma 17-50 OS’ fixed f/2.8 max aperture across the entire focal length range provides 4x as much light to the sensor (2 stops) as most kit lenses offer at their longest focal length (f/5.6). This aperture difference can translate into a big difference in your image quality. There are many lenses with longer focal length ranges available.
What kind of lens does Sigma make?
Large aperture standard zoom lens with a minimum focal length of 17mm, designed exclusively for digital SLR cameras and incorporating Sigma’s original OS (Optical Stabilizer). The OS function offers superior Stabilization. The lens has a compact construction with an overall length of 91.8mm.