Sigma 18-250mm f/3.5-6.3 DC Macro OS HSM review
The 18-250mm f/3.5-6.3 DC Macro OS HSM is the latest in a long line of all-in-one 'superzoom' lenses from Sigma, having been announced in June 2012. It offers two main developments over its predecessor, the confusingly similarly-named 18-250mm f/3.5-6.3 DC OS HSM - namely improved close-up capability (hence the 'Macro' moniker), and a significant reduction in size and weight. Sigma says the latter is due to the use of a 'Thermally Stable Composite' (TSC) material in the construction of the lens barrel, which makes it almost identical in size to its main rival - the Tamron 18-270mm F/3.5-6.3 Di II VC PZD.
Like Tamron, Sigma has included optical image stabilization in the lens design, promising the ability to hand-hold the lens at shutter speeds four stops slower than usual before camera shake becomes a problem. The lens features an ultrasonic-type 'Hypersonic Motor' for quiet focusing, which means it will autofocus on entry-level Nikon SLR bodies. Despite its improved close-focusing abilities, the optical formula is actually a bit simpler than its predecessor's, and uses only a single Super-Low Dispersion glass element rather than four. Three aspheric elements are also used in the 16 element, 13 group design.
The 18-250mm offers an impressive wideangle to telephoto range (equivalent to roughly 28-400mm on full frame), which is beaten only by the aforementioned Tamron 18-270mm F/3.5-6.3 Di II VC PZD and the recently-released Nikon AF-S DX Nikkor 18-300mm F3.5-5.6G ED VR. It will be available in Sigma, Nikon, Canon, Sony and Pentax mounts, although the latter two versions won't feature optical stabilization and will rely on the cameras' built-in systems instead. As usual for a new product it comes to market at a higher street price compared to its predecessor, but look a little closer and the RRP has actually dropped.
- Approx. 28-400mm equivalent focal length range; F3.5-6.3 maximum aperture
- Available for Canon, Nikon, Pentax, Sigma and Sony mounts (APS-C/DX format DSLRs only)
- In-lens Optical Stabilization system (excluding Pentax and Sony versions).
- Hypersonic Motor (HSM) focusing
- 0.35m closest focus (0.34x magnification)
Angle of view
The pictures below illustrate the focal length range from wide to telephoto (on Canon APS-C, 1.6x).
|18mm (29mm equivalent)||250mm (400mm equivalent)|
Sigma 18-250mm f/3.5-6.3 DC Macro OS HSM specifications
|Price||• $550 (US)
• £499 (UK)
|Date introduced||June 2012|
|Maximum format size||APS-C/DX|
|35mm equivalent focal length
||• 27-375mm (1.5x APS-C / DX)
• 29-400mm (1.6x Canon APS-C)
|Diagonal Angle of view (APS-C)||74º - 6º|
|Lens Construction||• 16 elements / 13 groups
• 1 SLD glass element
• 3 aspherical elements
|Number of diaphragm blades||7, rounded|
|AF motor type||• Micro-type Hypersonic Motor|
|Image stabilization||• Yes; 4 stops claimed benefit
• Automatic panning detection
|Filter thread||• 62mm
• Does not rotate on focus
|Supplied accessories*|| Front and rear caps
|Weight||470 g (16.6 oz)|
|Dimensions||73.5 mm diameter x 88.6 mm length
(2.9 x 3.5 in)
|Lens Mount||Canon, Nikon, Pentax (KAF3), Sigma, Sony|
* Supplied accessories may differ in each country or area