Review Lens: Sigma 17-50mm F2.8 EX DC HSM Pentax

Lens Overview - Sigma 17-50mm F2.8

Characterized by its versatile zoom range and bright design, the Canon EF-mount 17-50mm f/2.8 EX DC OS HSM from Sigma covers a wide-angle to portrait-length range and features a constant f/2.8 maximum aperture to excel in available light conditions. The optical design incorporates a pair of low dispersion elements along with a trio of aspherical elements to reduce a variety of aberrations and promote greater sharpness and clarity. A Super Multi-Layer Coating is also used to suppress flare and ghosting for improved contrast and color accuracy. Benefitting the optics, a Hyper Sonic Motor affords quick and quiet autofocus performance while an Optical Stabilizer minimizes the appearance of camera shake for sharper handheld shooting. Additionally, the lens is distinguished by its sleek profile, making it an ideal lens for walkaround and travel shooting.

Standard zoom lens is designed for APS-C-format Canon EF-mount cameras and provides a 27.2-80mm equivalent focal length range.
Constant f/2.8 maximum aperture is well-suited for working in low-light conditions and also provides greater control over the focus position when using shallow depth of field techniques.
Two F Low Dispersion (FLD) elements are featured in the optical design, and help to reduce color fringing and chromatic aberrations for improved clarity and color accuracy.
Three aspherical elements are used to help limit distortion and spherical aberrations and also contribute to greater overall sharpness and accurate rendering.
Super Multi-Layer Coating has been applied to individual elements to minimize flare and ghosting for improved contrast and color accuracy when working in strong lighting conditions.
Hyper Sonic Motor (HSM), along with an internal focusing design, realizes quick and quiet autofocus performance as well as full-time manual focus override.
Minimum focusing distance of 11" and a 1:5 maximum magnification ratio benefits working with close-up subjects.
Optical Stabilizer system minimizes the appearance of camera shake to benefit making sharper imagery when shooting handheld.
Rounded seven-blade diaphragm contributes to a pleasing bokeh quality.
UPC: 085126583545

Sigma 17-50mm F2.8 Latest Price



Focal Length17 to 50mm (35mm Equivalent Focal Length: 27.2 to 80mm)
Maximum Aperturef/2.8
Minimum Aperturef/22
Lens MountCanon EF
Format CompatibilityAPS-C
Angle of View79.7° to 31.7°
Minimum Focus Distance11.02" / 28 cm
Maximum Magnification0.2x
Optical Design17 Elements in 13 Groups
Diaphragm Blades7, Rounded
Focus TypeAutofocus
Image StabilizationYes
Filter Size77 mm (Front)
Dimensions (ø x L)3.29 x 3.61" / 83.5 x 91.8 mm
Weight1.2 lb / 565 g

Photos Example - Sigma 17-50mm F2.8

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Lens Technical

Sigma 17-50mm F2.8 EX DC HSM PentaxPentax HD DA* 11-18mm F2.8 ED DC AWCanon RF 70-200mm F2.8L IS USM
Name Sigma 17-50mm F2.8 EX DC HSM PentaxPentax HD DA* 11-18mm F2.8 ED DC AWCanon RF 70-200mm F2.8L IS USM
Max Aperture At Min Focal f/2.8f/2.8f/2.8
Year 201120192019
Mount Type Pentax KAFPentax KAFCanon RF
Lens Type Lens Superwide,lens Wide,lens MediumLens SuperwideLens Medium,lens Telephoto,lens Supertelephoto
Auto Focus NoNoNo
Price $669$1840
Lens Zoom ZoomZoomZoom
Lens Range 171170
Global 21.1133
Effective Mega Pixel 13.4178
Distorsion 0.336374
Vignetting -1.04597
Tstop 3.14077
Ac 9.34254
Vignetting Ranking 7704
Tstop Ranking 4907
Ac Ranking 7084
Pixel Depth 24
Price Sensor 1300
Sensor Raw 24.51
Sensor Format Sensor Apsc
Type SemiProDSLR
Zoom Factor 111
Weight 1lb1lb1lb
Macro NoNoNo
Launch Date Dec. 2011Jan. 2019Feb. 2019
Brand SigmaPentaxCanon


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