SigmaAF 28mm f/1.8 EX DG Aspherical Macro For Pentax

Special Price $423.99 Regular Price $599.99

Product Highlights

  • Focal Length 28mm
  • APS Equivalent 1.5x: 42mm; 1.6x: 44.8mm
  • Max Aperture ƒ/1.8
  • Min Aperture ƒ/22
  • Diaphragm Blades 9
  • Lens Construction 10 elements in 9 groups, including 2 aspherical elements
Focal Length 28mm
APS Equivalent 1.5x: 42mm; 1.6x: 44.8mm
Max Aperture ƒ/1.8
Min Aperture ƒ/22
Diaphragm Blades 9
Lens Construction 10 elements in 9 groups, including 2 aspherical elements
SigmaAF 28mm f/1.8 EX DG Aspherical Macro For Pentax is available to buy in increments of 1
In stock
SKU Sigma AF 28mm f/1.8 EX DG Pentax

Features:

Like its 24mm sibling, the styling of the Sigma 28mm ƒ/1.8 lens suggests that it isn't one of Sigma's recent designs. Also like the 24mm, it competes with lenses from Canon and Nikon, as well as being available in Sony and Pentax mounts. The lens was designed to fit 35mm film or a full-frame sensor, and will provide an equivalent field of view of approximately 42mm when used on an APS-C-sized sensor. The Nikon version of the lens does not have a built-in motor, so it won't autofocus on consumer bodies such as the D3100 or D5100. The Sigma 28mm ƒ/1.8 EX DG Aspherical Macro ships with a petal-shaped lens hood, accepts 77mm filters, and is available now for approximately $450. Sharpness Mounted on the sub-frame Canon 7D, when used wide open at ƒ/1.8, the lens provides fairly sharp results throughout the center of the frame, degrading to somewhat soft corners.
Our sample of this lens appears to be slightly de-centered, favoring the lower part of the frame. Unsurprisingly, there is little difference in terms of sharpness between ƒ/1.8 and ƒ/2; however, stopping down to ƒ/2.8 provides an impressive increase in sharpness, with the same central area of the frame becoming sharp, and only slightly soft in the corners. Stopping down further to ƒ/8 provides further, but minor, gains in sharpness. At ƒ/11 there is some further reduction in corner softness, at the slight expense of central sharpness, but the numbers are fairly small at that point. Diffraction limiting sets in at ƒ/11, but there's very little to note; at ƒ/16 it's more noteworthy, with the image showing average sharpness across the frame. Fully stopped-down at ƒ/22, the lens is neither sharp nor soft.

GENERAL FEATURES

Name Sigma 28mm ƒ/1.8 EX DG Aspherical Macro
Image Circle 35mm
Type Wide Prime
Focal Length 28mm
APS Equivalent 1.5x: 42mm; 1.6x: 44.8mm
Max Aperture ƒ/1.8
Min Aperture ƒ/22
Diaphragm Blades 9
Lens Construction 10 elements in 9 groups, including 2 aspherical elements
Diagonal Angle of View(Based on image circle) 75.4 degrees
Focus Details Internal with Dual Focus mechanism
Front Element Rotation No
Zoom System n/a
Closest Focus 20cm / 7.9 in.
Magnification Ratio 0.34x / 1:2.9
Filter Size 77mm
Dimensions(Length x Diameter) 82.5mm x 83.6mm / 3.2 in. x 3.3 in.
Weight 500g / 17.6 oz
Available Pentax
More Information
Focal Length 26-49 mm
Lens Type Macro
Product Name SigmaAF 28mm f/1.8 EX DG Aspherical Macro For Pentax
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