Ngày ra mắt: 17-tháng 04-2013 | Zoom lens, Canon EF-S - Nikon F (DX) - Pentax KAF - Sigma SA Bayonet - Sony/Minolta Alpha DT, 210 Show
Chọn để so sánh Ống kính Sigma 18-35mm F1.8 DC HSM Art nổi bật với khẩu lớn và thiết kế đẹp. Khẩu độ tối đa F1.8 không đổi là rất lớn ở dải tiêu cự này, giúp nó làm việc hiệu quả trong môi trường ánh sáng yếu và có thể kiểm soát độ sâu trường ảnh tốt. Cấu trúc quang học sử dụng nhiều thấu kính SLD và thấu kính phi cầu làm giảm quang sai, viền màu, giảm méo ảnh. Lớp phủ Super Multi-Layer triệt tiêu hiện tượng lóa, bóng ma, cải thiện độ tương phản và chính xác màu sắc. Nó còn có động cơ Hyper Sonic Motor tiên tiến với thiết kế lấy nét trong, mang đến khả năng lấy nét nhanh, chính xác và yên tĩnh.Ngày ra mắt 17-tháng 04-2013 Phù hợp cảm biến APS-C / DX Ngàm ống kính
Các thành phần / yếu tố đặc biệt 5 thấu kính SLD, 4 thấu kính phi cầu, lớp phủ Super Multi-Layer Khoảng cách lấy nét tối thiểu 0.28 m Loại động cơ lấy nét Ring-type ultrasonic Lấy nét tay toàn phần (Full time manual) Có Phương pháp lấy nét Lấy nét trong Thước đo độ sâu trường ảnh Không Kiểu zoom Xoay (bên trong) Hãy chia sẻ cảm nhận của bạn về thiết bị này. Điểm trung bình: 4.4 - 34 đánh giá Click vào hình sao để đánh giá thiết bị Thiết bị cùng loạiTư vấn chọn mua máy ảnhNgoài ống kính fix cho người mới bắt đầu quay phim, sử dụng một ống kính zoom tầm trung tiêu cự chuẩn sẽ rất tuyệt vời cho nhu cầu điện ảnh.  SIGMA 18-35MM DC HSM ART được đánh giá là ống kính linh hoạt yêu thích của dân làm phim nghiệp dư đang tìm kiếm một ống kính hữu dụng, có khả năng quay phim ở bất cứ tình huống nào. Ở khẩu độ 1.8, ống kính này được đánh giá là “chiến binh” tạo cảnh quay đẹp mắt kể cả thiếu sáng. Ống kính này hoạt động hiệu quả và mượt mà ở từng dải tiêu cự. Tại tiêu cự 18mm, nhà làm phim có thể tận dụng khả năng quay mạnh mẽ góc rộng. Lý tưởng hơn với 24mm, khả năng tự động lấy nét siêu âm, giữ cho đối tượng sắc nét trong mọi chuyển động. Hiệu suất quang học cực cao cùng khả năng tái tạo màu huyền thoại là điểm cộng rất lớn cho ống kính này. Đặc biệt ở 35mm – Một trong những tiêu cự tạo ra góc nhìn đa chiều, rất có ích cho người mới bắt đầu. Sigma has a long history as a lens maker, having been founded over 50 years ago. In the film era it was best known for relatively inexpensive lenses that undercut the camera makers' own equivalents in terms of price. But this has changed over the part decade or so; while other companies have shifted manufacturing to cheaper locations such as China and Thailand, Sigma has stubbornly refused to move from its factory in Aizu, Japan. This means it can no longer compete in the same way on price alone, and it's therefore switched its focus towards higher-value offerings. Over the past few years we've seen increasingly ambitious concepts appear from the company's design studios. The original (and recently-replaced) 30mm F1.4 EX DC HSM has long been one of our favourite lenses for APS-C SLRs, and the 50mm F1.4 EX DG HSM grabbed our attention back in 2008 due to its sharpness at large apertures. Most recently the 35mm F1.4 DG HSM impressed us with its exceptional optical quality at a very competitive price. This all bodes well for the company's latest offering - the record-breaking 18-35mm F1.8 DC HSM, which is the first constant F1.8 SLR zoom lens to hit the market. Sigma's choice of F1.8 as maximum aperture isn't a coincidence; it means that the lens will offer the same control over depth of field as an F2.8 zoom does on full frame. What's more, combined with an APS-C sensor, the system will also offer effectively the same light-gathering capability as an F2.8 lens on full frame. By this we mean that it will be able to project an image that's just over twice as bright onto a sensor that's slightly less than half the area, meaning the same total amount of light is used to capture the image. This is important as it's a major determinant of image quality. Essentially it means that APS-C shooters will be able to use lower ISOs when shooting wide open in low light and get similar levels of image noise, substantially negating one of the key advantages of switching to full frame. As we'd expect at this level, the lens uses an ultrasonic autofocus motor for fast, silent focusing. It's compatible with Sigma's new USB dock which allows you to fine-tune autofocus behaviour in much more detail than the AF microadjust corrections found on SLRs, which should help get the best possible focus accuracy and make the most of the large aperture. It also incorporates several of the thoughtful design touches that we were impressed by on the 35mm F1.4, including an improved AF switch, and a large grip area on the base of the barrel for better handling. The lens's 27-53mm equivalent focal length range is obviously a little limited, but should still be rather useful for such applications as wedding and events photography. So while it may not quite match the capabilities of a 24-70mm F2.8 on a full frame SLR, for existing APS-C users it should offer something very close. Crucially, at a street price of around $800 / £650 at the time of writing, for existing APS-C shooters it's an awful lot cheaper than buying a 24-70mm F2.8 and a full frame SLR to go with it. Overall the 18-35mm F1.8 is a really intriguing product, and we applaud Sigma for pushing the boundaries of lens design ahead of the more conservative camera manufacturers. But can an F1.8 zoom really deliver good results? Let's find out. Headline features
Angle of viewThe pictures below illustrate the focal length range from wide to telephoto (on Canon APS-C, 1.6x). The 18-35mm covers a modest 2x zoom range. Sigma 18-35mm F1.8 DC HSM specificationsDate introduced April 2013 Street Price (August 2013) • $800 (US) • £650 (UK) • €850 (EU) Maximum format size APS-C Focal length 18-35mm 35mm equivalent focal length (APS-C) • 27-53mm (1.5x) • 29-56mm (Canon 1.6x) Diagonal angle of view 76.5° - 44.2° Maximum aperture F1.8 Minimum aperture F16 Lens Construction • 17 elements in 12 groups • 5 SLD glass elements • 4 glassmold aspherical elements Number of diaphragm blades 9, rounded Minimum focus 0.28m / 0.92ft Maximum magnification 0.23x AF motor type • Ring-type Ultrasonic Motor • Full time manual focus Focus method Internal Zoom method Rotary, internal Image stabilization No Filter thread • 72mm • Does not rotate on focus Supplied accessories* • Front and rear caps • Lens hood LH780-03 Weight 810g (28.6 oz) Dimensions 78mm diameter x 121mm length (3.1 x 4.8 in) Lens Mount Canon EF, Nikon F, Pentax K, Sigma SA, Sony A * Supplied accessories may differ in each country or area You may also likeMore about gear in this articleWe're at the CP+ show in Japan this week and one of the busiest stands belongs to Sigma. Best known for manufacturing lenses, Sigma is showing off its latest camera, the dp2 Quattro. Editor Barnaby Britton sat down with Kazuto Yamaki, CEO of Sigma, for a chat about the Quattro, as well as the challenges of the modern photography industry and what it's like being the head of a family business. Before Christmas, we asked you to vote for your favorite cameras and lenses in five categories. We announced the category winners earlier this year and created a final poll to find what - in your opinion - was the single standout product of 2013. Click through for a reminder of the category winners and to find out which of the winning products was your choice for 2013 product of the year! Last month you voted for the best gear in five categories, and now's your chance to let us know which of the winning products was the most impressive. The poll stays open until the end of this month, and if you haven't voted yet this is your chance! Click through for a look at the 2013 category winners from our five classes, and a chance to cast your vote. Last month you voted for the best gear in five categories, and now's your chance to let us know which of the winning products was the most impressive. With almost 30,000 votes cast already we know that you've got plenty of opinions about which cameras and lenses stood out, but we want more! We want to know which one you thought was the absolute best. Click through for a look at the category winners from our five classes, and a chance to cast your vote! The results are in! Before Christmas, we asked you to vote for your favorite gear in five categories. Best lens, best DSLR / SLT, best fixed-lens compact camera, best mirrorless interchangeable lens camera and best enthusiast zoom compact. Now, with almost 30,000 votes cast since December 18th the results are in! Click through to take a look at the category winners and runners-up. 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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. What’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. 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. |
