Sigma 70200mm F28 Ex Dg Os Hsm Af Review
It'southward at present over a decade since Sigma'due south original 70-200mm F2.viii APO pattern commencement saw the lite of twenty-four hours, and after three successive makeovers, the company clearly felt it was time to start again from scratch. The result is this: the 70-200mm i:2.8 EX DG OS HSM, which despite its like-sounding name is a completely new design. It was appear back in February alongside iv other lenses, as Sigma stole the show at an otherwise-tranquillity PMA 2010. The 'OS' stands for 'Optical Stabilizer', this being is the first prototype-stabilized fast telephoto zoom to emerge from a third-party lens maker. Indeed the combination of in-lens stabilization and Sigma'due south ultrasonic-type 'HyperSonic Motor' (HSM) focusing is sure to make a compelling package for a wide range of users - it'south considerably cheaper than Canon and Nikon's like options, while offer the option of optical stabilization to Sony and Pentax users for the commencement time in this blazon of lens.
The 70-200mm F2.eight OS sports a brand-new optical optical formula which incorporates a new weapon in the lens maker'due south armory, the latest type of glass which Sigma calls 'FLD' for 'F' Low Dispersion. This slightly opaque nomenclature indicates that it has similar optical properties to Fluorite, an expensive and hard-to-piece of work material that Canon has employed in the course of establishing its reputation every bit a maker of excellent telephotos. The lxx-200mm F2.eight OS HSM uses two FLD elements inside its 22 element / 17 grouping construction, alongside 3 elements made from the more than conventional Super-Low Dispersion (SLD) glass. Sigma promises that this should give excellent correction for residue chromatic aberration.
The lens'southward impressive specification is rounded off with a 9-blade circular aperture for the attractive rendition of out-of-focus regions of the image, plus an adapter that extends the length of the lens hood to provide more than effective shading for users of APS-C format DSLRs. The minimum focus altitude is ane.4m, with a maximum magnification of 0.13x, which is a footstep back from the 1m minimum focus and 0.28x magnification of the most contempo lxx-200mm F2.viii EX DG Macro HSM Ii. All this is topped-off past a toll which, while substantially higher than the older lens, is still substantially lower than its Nikon and Catechism equivalents. On paper at least, this all adds up to a mouthwatering bundle; so let'due south see how well the lens lives up to its promise.
Sigma 70-200mm F2.eight design history
- 70-200mm F2.8 EX APO - Original version, minimum focus distance 1.8m (1999)
- 70-200mm F2.eight EX DG - Improver of 'digitally optimized' lens coatings to reduce flare (2005)
- 70-200mm F2.8 EX DG Macro (HSM) - Minimum focus distance reduced to 1m (2006)
- 70-200mm F2.8 EX DG Macro HSM 2 - Improved optical performance (2007)
- 70-200mm F2.8 EX DG OS HSM - All-new design with built-in Optical Stabilization (2010)
Headline features
- 70-200mm focal length range; fast F2.8 abiding maximum aperture
- Optical image stabilization – 4 stops claimed
- Ring-type HSM focusing with full-time transmission override
- Available in Catechism, Nikon, Pentax, Sigma and Sony mounts
Angle of view
The pictures beneath illustrate the focal length range from wide to telephoto, on 35mm full-frame and APS-C photographic camera bodies:
 |  |
| 70mm (full frame) | 200mm (full frame) |
|---|
 |  |
| 70mm (APS-C; 112mm equivalent) | 200mm (APS-C; 320mm equivalent) |
|---|
Sigma seventy-200mm 1:ii.8 EX DG OS HSM specifications
| Price | • The states: $1800 • Uk: £1300 |
|---|---|
| Engagement introduced | February 2010 |
| Maximum format size | 35mm total frame |
| Focal length | 70-200mm |
| 35mm equivalent focal length (APS-C) | • 105-300mm (Nikon, Sony, Pentax 1.5x) • 112-320mm (Catechism one.6x) • 119-340mm (Sigma 1.7x) |
| Diagonal Angle of view (FF) | 34º - 12º |
| Diagonal Angle of view (APS-C) | 23º - 8º |
| Maximum aperture | F2.8 |
| Minimum aperture | F22 |
| Lens Structure | • 22 elements / 17 groups • ii FLD elements • 3 SLD elements |
| Number of diaphragm blades | 9, rounded |
| Minimum focus | ane.4m |
| Maximum magnification | 0.13x at 200mm |
| AF motor type | • Ring-type Ultrasonic Motor • Full-fourth dimension manual focus |
| Focus method | Internal |
| Zoom method | Internal |
| Image stabilization | • 4 stops claimed • Dual style - Normal and panning |
| Filter thread | • 77mm • Does not rotate on focus |
| Supplied accessories | • Front end and rear caps • Hood • APS-C hood adapter • Soft Example |
| Weight | 1430 g (3.2 lb) |
| Dimensions | 86 mm diameter x 197 mm length (3.4 x vii.8 in) |
| Lens Mountain | Canon, Nikon, Pentax, Sigma, Sony |
* Supplied accessories may differ in each land or area
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Source: https://www.dpreview.com/reviews/sigma-70-200-2p8-os-c16
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