20mm F2.8 Wide-Angle Prime Lens

20mm F2.8 Wide-Angle Prime Lens

This rigrously corrected lens gives you a wide angle of view for images that benefit from dramatic perspective with minimum distortion. It's an ideal choice for covering spread-out scenes that you can't get far enough away from to cover with a "normal" lens. Meticulous attention has been paid to minimizing flare and internal reflection in this advanced design, with the result that excellent sharpness and contrast are maintained through the image.
20mm F2.8 Wide-Angle Prime Lens

Circular Aperture

When changing your aperture to defocus the background, the light sources appear blurred. This 'bokeh' effect of the blurred background can be enhanced with circular aperture blades used in this lens. Conventional aperture blades have flat sides creating unappealing polygonal shaped defocussed points of light. α lenses overcome this problem through a unique design that keeps the aperture almost perfectly circular from its wide-open setting to when it is closed by 2 stops. Smoother, more natural defocusing can be obtained as a result.

Rear focusing elements

Only the rear groups of the optical system move to focus the lens, which allows for speedy AF operation and a shorter minimum focusing distance. Since the front of the lens does not rotate, operability is improved when shooting with a polarizing filter attached.

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Optics/Lens
Lens Type Wide Angle & Wide Angle Zoom
Lens Mount Type Sony A-mount
Aperture (Max.) f/2.8
Aperture (Min.) f/22
Focal Length (35mm equivalent) APS: 30mm (35mm Equivalent: 20mm)
Filter Diameter 72mm
Lens Groups-Elements 9 groups, 10 elements
Minimum Focus Distance 9.6” (25cm)
Aperture Blade 7 blades (Circular aperture)
Aspheric Elements no aspheric
Depth-of-Field Yes
Distance Scale Yes
Lens Weight 10 oz (285g)
Magnification x 0.13
Weights and Measurements
Dimensions (Approx.) 3 1/8 x 2 1/8” (78 x 53.5mm)
Weight (Approx.) 10 oz (285g)

  • Front and rear lens cap
  • ALC-SH0013 petal lens hood