Sony APS-C 20mm f/2.8 Lens
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- Manufacturer part SEL20F28
- Dell part A7573085
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E 20mm F2.8 E-mount Prime Lens
Not only will the 20mm (30mm in 35mm full-frame format) focal length and F2.8 maximum aperture appeal to experienced photographers, but the outstanding resolution of this lens will satisfy their most stringent image quality requirements as well. Three aspheric elements help to achieve superb contrast and resolution right out to the image edges, while simultaneously enabling a compact 20.4 mm-thick pancake design that makes for a portable combination with compact E-mount cameras.
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.
Aspherical lens elements
Aspherical lens design dramatically reduces spherical aberration while also reducing lens size and weight. Spherical aberration is a slight misalignment of the light rays projected on the image plane. This is caused by differences in refraction at different points on conventional spherical lenses which degrade image quality in large-aperture lenses. Specially shaped "aspherical" elements near the diaphragm restore alignment of light rays at the image plane, maintaining high sharpness and contrast even at maximum aperture and can also be used at other points in the optical path to reduce distortion. Well-designed aspherical elements can reduce the total number of elements required in the lens, thus reducing overall size and weight. Advanced Aspherical (AA) elements are an evolved variant, featuring an extremely high thickness ratio between the center and periphery. AA elements are exceedingly difficult to produce, relying on the most advanced molding technology to consistently and precisely achieve the required shape and surface accuracy, resulting in significantly improved image accuracy and quality.
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.Sony customer reviews
Great Little Lens
Jeepislander, Pennsylvania, United States:
This lens is the sprit of the compact mirrorless cameras. Super compact, sharp great all round..
Specifications
| Optics/Lens | |
|---|---|
| Lens Mount Type | Sony E-mount |
| Aperture | Circular |
| Aperture (Max.) | f/2.8 |
| Aperture (Min.) | f/16 |
| Focal Length (35mm equivalent) |
20mm (35mm) 30mm (APS-C) |
| Filter Diameter | 49mm |
| Lens Groups-Elements | 6 groups, 6 elements |
| AF for Movie Capture | Yes |
| Minimum Focus Distance |
7.92" 0.2m |
| Angle of View | 70° |
| Aperture Blade | 7 blades (Circular aperture) |
| Aspheric Elements | 3 aspheric surface |
| Direct Manual Focus | Yes |
| Exterior Finish | Metal |
| Focus Ring in AF Mode | No rotation |
| Internal Motor | Yes (Stepping motor) |
| Lens Weight | 2.4 oz (69g) |
| Low Noise During Movie Capture | Excellent |
| Maximum Magnification | 0.12x |
| Mount Material | Metal |
| Non-rotating Focusing Ring | No rotation |
| Weights and Measurements | |
| Dimensions (Approx.) |
2-1/2" x 13/16" (62.6 x 20.4 mm) |
| Weight (Approx.) | 2.4 oz (69g) |
| Service and Warranty Information | |
| Limited Warranty Term | 1 Year Parts & Labor |
What's in the Box
- Front and rear lens cap
- ALC-SH113 lens hood (cap)
Three a spherical lens elements correct distortions and aberrations. In particular, image quality in peripheral areas has been dramatically improved compared to previous lenses. The high resolution and excellent contrast assures richly detailed images free of distortion, making the lens an outstanding choice for a wide range of subjects such as casual snapshots to majestic landscapes. Measuring a mere 13/16-inch (20.4mm) the lens is 2mm shorter than the SEL16F28 The aluminum alloy lens barrel is inlaid into a molded-plastic component for a lightweight yet durable construction and features beautiful laser engraving of the product name and focal length for a stylish finish. The control ring allowsfor easy operation while the lens exudes a stylish appeal. The SEL20F28 features seven aperture blades that form a near circle. This result in a pleasing defocused circular effect on the background of your image when the aperture is set wide open. The same type of internal stepping motor used for the focus drive is used for aperture actuation as well, that result in a smooth, low-noise aperture operation ideally suited to movie shooting. With a 20mm focal length (35mm equivalent 30mm) and a bright maximum aperture of F2.8, the SEL20F28 is ideal for a variety of subjects from landscapes, interiors to casual snapshots.
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