Đánh giá sigma 70-200 f2.8 apo năm 2024
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It's now over a decade since Sigma's original 70-200mm F2.8 APO design first saw the light of day, and after three successive makeovers, the company clearly felt it was time to start again from scratch. The result is this: the 70-200mm 1:2.8 EX DG OS HSM, which despite its similar-sounding name is a completely new design. It was announced back in February alongside four other lenses, as Sigma stole the show at an otherwise-quiet PMA 2010. The 'OS' stands for 'Optical Stabilizer', this being is the first image-stabilized fast telephoto zoom to emerge from a third-party lens maker. Indeed the combination of in-lens stabilization and Sigma's ultrasonic-type 'HyperSonic Motor' (HSM) focusing is sure to make a compelling package for a wide range of users - it's considerably cheaper than Canon and Nikon's similar options, while offering the option of optical stabilization to Sony and Pentax users for the first time in this type of lens. Show The 70-200mm F2.8 OS sports a brand-new optical optical formula which incorporates a new weapon in the lens maker's 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 difficult-to-work material that Canon has employed in the course of establishing its reputation as a maker of excellent telephotos. The 70-200mm F2.8 OS HSM uses two FLD elements within its 22 element / 17 group construction, alongside three elements made from the more conventional Super-Low Dispersion (SLD) glass. Sigma promises that this should give excellent correction for residual chromatic aberration. The lens's 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 effective shading for users of APS-C format DSLRs. The minimum focus distance is 1.4m, with a maximum magnification of 0.13x, which is a step back from the 1m minimum focus and 0.28x magnification of the most recent 70-200mm F2.8 EX DG Macro HSM II. All this is topped-off by a price which, while substantially higher than the older lens, is still substantially lower than its Nikon and Canon equivalents. On paper at least, this all adds up to a mouthwatering package; so let's see how well the lens lives up to its promise. Sigma 70-200mm F2.8 design history
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Angle of viewThe pictures below illustrate the focal length range from wide to telephoto, on 35mm full-frame and APS-C camera bodies: Sigma 70-200mm 1:2.8 EX DG OS HSM specificationsPrice • US: $1800 • UK: £1300 Date introduced February 2010 Maximum format size 35mm full frame Focal length 70-200mm 35mm equivalent focal length (APS-C) • 105-300mm (Nikon, Sony, Pentax 1.5x) • 112-320mm (Canon 1.6x) • 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 Construction • 22 elements / 17 groups • 2 FLD elements • 3 SLD elements Number of diaphragm blades 9, rounded Minimum focus 1.4m Maximum magnification 0.13x at 200mm AF motor type • Ring-type Ultrasonic Motor • Full-time manual focus Focus method Internal Zoom method Internal Image stabilization • 4 stops claimed • Dual mode - Normal and panning Filter thread • 77mm • Does not rotate on focus Supplied accessories • Front and rear caps • Hood • APS-C hood adapter • Soft Case Weight 1430 g (3.2 lb) Dimensions 86 mm diameter x 197 mm length (3.4 x 7.8 in) Lens Mount Canon, Nikon, Pentax, Sigma, Sony * Supplied accessories may differ in each country or area You may also likeMore about gear in this articleSigma is getting Black Friday started early this year, offering discounts on five of its lenses online now through Monday, November 30th including the 50mm F1.4 DG HSM Art. Savings range from $100 up to $300 off individual lenses - and considering the current results of our readers' poll, a few of you may be interested. Read more Latest sample galleriesLatest in-depth reviewsThe fourth camera in Leica's SL series of full-frame mirrorless cameras sees the 60MP BSI sensor from the Q3 and M11 models arrive with a significant interface redesign. The Fujifilm X100VI is the sixth iteration of Fujifilm's classically-styled large sensor compact. A 40MP X-Trans sensor, in-body stabilization and 6.2K video are among the updates. The Nikon Zf is a 24MP full-frame mirrorless camera with classic looks that brings significant improvements to Nikon's mid-price cameras. We just shot a sample reel to get a better feel for its video features and have added our impressions to the review. This $250 electronic lens adapter is perfect for Nikon Z-mount curious Sony shooters — shhh, we won’t tell anyone. Sony updates the ZV-1, giving the vlog-centric compact camera a 18-50mm equivalent F1.8-4.0 lens that's now wide enough for less cramped selfie mode videos. Latest buying guidesWhat’s the best camera for around $2000? This price point gives you access to some of the most all-round capable cameras available. Excellent image quality, powerful autofocus and great looking video are the least you can expect. We've picked the models that really stand out. What's the best camera for travel? Good travel cameras should be small, versatile, and offer good image quality. In this buying guide we've rounded-up several great cameras for travel and recommended the best. If you want a compact camera that produces great quality photos without the hassle of changing lenses, there are plenty of choices available for every budget. Read on to find out which portable enthusiast compacts are our favorites. 'What's the best mirrorless camera?' We're glad you asked. Above $2500 cameras tend to become increasingly specialized, making it difficult to select a 'best' option. We case our eye over the options costing more than $2500 but less than $4000, to find the best all-rounder. |
