Sigma Ex Dc 18-50mm F/28 Dc Lens for Nikon Review
Sigma 18-fifty mm F2.8 EX DC lens
Sigma has today announced a further extension to its range of DC lenses which are designed specifically for digital SLR'due south. The new xviii-50 mm F2.8 EX DC has a very usable 18 mm wide angle (approx 28 mm FOV on a digital SLR) to 50 mm telephoto (approx. 2.7x zoom). Like all DC lenses the prototype circle produced by this lens is designed to be just the right size for APS size sensors and hence allows the lens to be more meaty than it would otherwise exist.
Press Release:
Sigma 18-50mm F2.eight EX DC
EX series, big aperture zoom lens designed specifically for use with digital SLR cameras
- EX lens series denotes excellence of engineering and new applied science.
- Compact and lightweight zoom despite large F2.8 aperture.
- First-class correction for diverse types of aberration provided past i SLD (Special Low Dispersion) glass element and ii aspherical lenses.
- Super Multi Layer (SML) coating reduces flare and ghosting from which digital cameras tend to suffer.
F2.8 large aperture standard zoom lens designed especially for apply with digital SLR cameras.
The characteristics of digital SLR cameras were taken into consideration when designing the lens power layout. The new advanced lens design corrects various aberrations. This lens provides the utmost correction confronting lateral chromatic aberration which is a serious problem for digital SLR cameras.
This lens is peculiarly coated to go the best colour balance whilst cut down flare and ghost caused past reflections from the digital image sensor and lens. It has excellent correction for vignetting and superior peripheral effulgence is ensured.
A Special Low Dispersion (SLD) lens and 2 aspherical lens elements provide splendid correction for all types of aberrations. The design produces a compact and lightweight, nonetheless robust, structure with an overall length of 84.1mm (3.3in.) and maximum bore of 74.1mm (2.9in.) and weight of 445g (xv.6oz).
This lens has a minimum focusing distance of 28cm (11in.). It is equipped with inner focusing arrangement. The not-rotating front end lens element makes the lens suitable for using its petal-blazon lens hood and circular polarizing filters.
It is an ideal large aperture standard zoom lens for digital SLR cameras featuring APS-C size prototype sensor.
Sigma 18-50mm F2.eight EX DC lens specifications
| Focal length | 18 - l mm |
|---|---|
| Minimum aperture | F22 |
| Lens construction | 15 elements in 13 groups |
| Angle of view | 69.3° - 27.9° |
| Number of diaphragm blades | 7 pieces |
| Minimum focus distance | 28 mm (11 in) |
| Maximum magnification | one:5 |
| Filter size | 67 mm |
| Hood | Petal-type hood |
| Dimensions (Dia 10 Len) | 74.1 10 84.1 mm (2.9 ten 3.iii in) |
| Weight | 445 g (15.6 oz) |
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Source: https://www.dpreview.com/articles/6726511207/sigma1850dc
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