The Sigma 20-200mm f/3.5-6.3 DG Contemporary is an all-in-one zoom lens for Sony E-mount cameras. It covers focal lengths from ultra-wide 20mm to telephoto 200mm, so it can be used for landscapes and for sports action without changing lenses. It weighs 1.2 lb and measures 4.5" when not extended. The maximum aperture is f/6.3 at 200mm, and the maximum magnification ratio is 1:2 for close-up shots.
The optical design has 18 elements in 14 groups. It includes four aspherical elements, three Special Low Dispersion (SLD) elements and one F Low Dispersion (FLD) element. A 9-blade rounded diaphragm is used. Simulation technology was used to optimize backlight resistance, which helps minimize lens flare and ghosting.
The lens has a water- and oil-repellent coating on the front element and a dust- and splash-resistant construction. A focus mode switch and a zoom lock are included. The zoom lock keeps the lens from extending under its own weight, and it can also be released by operating the zoom. Autofocus uses Sigma's HLA (High-response Linear Actuator) system, which focuses quickly and quietly across the entire focusing range.
- Mount
- Sony E
- Focal length
- 20-200mm
- Aperture
- f/3.5-6.3 (f/6.3 at 200mm)
- Max magnification
- 1:2
- Optical design
- 18 elements in 14 groups
- Special elements
- 4 aspherical, 3 SLD, 1 FLD
- Diaphragm
- 9 blades, rounded
- Autofocus
- HLA (High-response Linear Actuator)
- Controls
- Focus mode switch, zoom lock
- Weather protection
- Dust- and splash-resistant construction
- Front coating
- Water- and oil-repellent
- Length
- 4.5" when not extended
- Weight
- 1.2 lb