Identification
The marking "SIGMA ZOOM 18-200mm 1:3.5-6.3 DC OS" should be on the front ring around the front lens element. You can also find "SIGMA DC 18-200mm 1:3.5-6.3" on the side of the lens barrel. Note: if the lens has a Nikon mount, then the model name will also include "HSM" at the end of the name.
Technical Specifications
General:
- Focal Length: 18-200 mm
- Maximum Aperture: f/3.5-6.3
- Minimum Aperture: f/22-40
- Closest Focusing Distance: 0.45 m
- Maximum Magnification: 0.26 x
- Maximum Magnification Ratio: 1:3.9
- Sensor Format: APS-C [DC]
Construction:
- Lens Groups: 13
- Lens Elements: 18
- No. of Diaphragm Blades: 7 (rounded)
- AF Motor Type:
- Nikon Mount: Micro-type hypersonic motor
- Canon & Sigma Mounts: DC micro motor
Physical:
- Lens Mount Types: Sigma SA-mount, Canon EF mount, Nikon F mount
- Filter Diameter: 72 mm
- Diameter x Length: 79 x 100 mm (3.1 x 3.9 in)
- Weight: 610 g
Accessories:
- Lens Hood: LH780-04
Source: Sigma Lens Specifications & Digital Photography Review