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不同機型，同樣精彩
AMIRA、ALEXA Mini、ALEXA SXT機型使用同一款影像傳感器，均擁有ARRI為電影人所打造的同等級最高畫質標準。
自2009年具有劃時代意義的數字35mm攝影機ALEXA系統問世以來，ARRI便以自身對電影技術近百年的領悟賦予了ALEXA數字攝影機系統不凡的使命——永不妥協的畫質。
如今，8年過去了， ARRI數字攝影機產品線日益擴大，現已經擁有ALEXA65、ALEXA SXT、ALEXA Mini、AMIRA等眾多機型。無論是重拾輝煌的ALEXA65還是功能無比強大的ALEXA SXT，乃至輕量化的ALEXA Mini以及開創電視畫面新時代的AMIRA，ARRI對畫質絕不妥協的追求獲得了全世界範圍內眾多電視、廣告以及電影攝影師們的認可。也正是這些有口皆碑的讚賞使得ALEXA級別的品質幾乎成了業內唯一的黃金標準，美國電影藝術與科學學院獎連續5年（2012-2016）都將奧斯卡最佳攝影獎授予了使用ALEXA所拍攝的影片，這些肯定使得ARRI在繼續探索迄最強大的數字攝影機系統道路上備受鼓舞。
也正如獲得過13次奧斯卡攝影獎提名的電影攝影師羅傑·狄金斯所言：
「ALEXA系統有各種型號與錄製方式可供選擇，我認為它是目前最好的攝影機系統，所有型號的畫質——據我親眼所見——都是最高的。」
—— 攝影師羅傑·狄金斯（CBE，ASC，BSC）
然而，如此殊榮的背後並不是一蹴而就。先是早在九十年代ARRI就開始嘗試的數位化研究，以及後來在Arrilaser膠片記錄儀和Arriscan膠片掃描儀等項目時獲得的經驗，再到後來對數字攝影機D-20、D-21的嘗試，ARRI在圖像科學、影像傳感器技術、軟體開發以及製造工藝上都積累了大量的經驗。後來這些經驗都被用在了ALEXA數字攝影機系統，一代又一代的工程師付出了大量的努力與智慧結晶。而如今，ARRI攝影機系統的所有成就要從這些攝影機所使用的同一款影像傳感器說起。
ARRI為ALEXA SXT、ALEXA Mini、AMIRA攝影機均配備了同一款專門定製的3.4K ALEV III CMOS雙增益構架影像傳感器，為電影人提供無差別的非凡畫質。這枚獨一無二的影像傳感器具備比標準Super35mm更大的感光面積（28.17mm*18.13mm），同時因為這塊傳感器不包含模數轉換器，可以騰出更多的面積用來給像素獲取光信號。所以ARRI的這塊3.4K ALEV III CMOS影像傳感器實現了遠比一般傳感器更大的單個像素感光面積，從而實現了「質量更高的像素，而不是更多」。ARRI用自己對電影技術的真正理解，在ALEXA像素大小、解析度以及畫面質量之間找到了完美的平衡，這些真正電影化的特徵使得ALEXA能夠以HD、2K、4K UHD或4K Cine等格式輸出遠超膠片質感的動人影像。
除此外，獨特的雙增益構造能同時從每一個像素中獲得兩組不同曝光值的信號，合併轉換成高質量的16bit數據並經過機內處理，最終以12bit模式封裝成具備寬廣動態範圍而又高質量的ARRIRAW或者ProRes數據，這意味著ALEXA平臺的高動態範圍畫面在設計之初就已經滿足了面向於未來的HDR需求。同時，ALEXA SXT的廣色域信號記錄能力也已經超越當前絕大多數顯示設備的色彩空間，為Rec 2020這樣的下一代色彩空間標準做好了準備，可以看到，所有關於ALEXA這枚影像傳感器的設計特徵都體現了ARRI 「對畫質永不妥協」的追求。
對於所有裝備了此款傳感器的攝影機ALEXA SXT、ALEXA Mini以及AMIRA來說，無論是緊湊、具備輕量化碳纖維外殼的ALEXA Mini，還是功能強大功能的中堅機型ALEXA SXT，或者是ENG風格的肩扛攝影機AMIRA，每一款攝影機都能實現大於14檔動態範圍高質量畫面記錄，所有機型都能實現ARRI為電影人所設定的同等畫面品質。
其中，ALEXA Mini是ALEXA家族中應用廣泛的多面手，能完美適用於無人機以及電子穩定雲臺。它避免了以往需要使用第三方攝影機進行特殊鏡頭的拍攝，在輕量化的同時實現了無可比擬的ALEXA級高品質畫面，像此前的ALEXA型號一樣被全球製作團隊所信賴。
全新升級的ALEXA SXT是ALEXA攝影機家族最新的高性能平臺，並全面取代之前的ALEXA XT型號。它沿用了ARRI經典的3.4K ALEV III CMOS影像傳感器，並獨闢蹊徑地使用了集大成之作的ALEXA 65的電子系統。這種開放而又頗具前瞻性的設計將最優異的整體畫質與最高效的現場/後期工作流程結合起來，進一步提升了ALEXA系統的品質標準，也最大化保證了攝影機持有人的投資回報。
值得特別強調的是ARRI攝影機家族新成員AMIRA，它是一款全能的輕便型手持攝影機。雖然並非ALEXA產品線，也有著不同於ALEXA攝影機系統的設計與定位，但ARRI毫無保留地將ALEXA級別的同等畫質賦予了AMIRA。
AMIRA使用的依然是跟ALEXA SXT、ALEXA Mini同一款專門定製的3.4K ALEV III CMOS雙增益構架影像傳感器，因此AMIRA像其他ALEXA機型一樣也有著大於14檔的動態範圍，遠超一般傳感器的單個像素感光面積和雙增益構架為AMIRA帶來不可思議的低照度畫質和精細的高光細節記錄能力。它不僅擁有完全同等於ALEXA級別的高品質畫面， AMIRA還能以非裁切模式實現高達200fps的拍攝。
AMIRA適用於各種類型的製作，電視劇、低成本電影、野外紀錄片、賽事轉播、影視廣告、新聞報導、宣傳片到多機位電視直播，AMIRA均能勝任。尤其是在那些特別需要手持拍攝與單人操作的項目，AMIRA專為單人肩扛操作而設計的人體工程學將為攝影師帶來全新的肩扛體驗。在那些無法精細布置拍攝現場或者需要快速出片的項目，AMIRA的高動態範圍讓攝影師輕鬆應對任何平庸的場景。經濟而又快速的CFast 2.0工作流程、ALEXA同等的畫面、可靠的ARRI級別做工品質使得AMIRA不僅是小團隊項目的能手，更是使用ALEXA系統拍攝大項目時完美而又經濟的B機選擇。
當然，不僅僅是AMIRA，無論你使用何種型號的ARRI攝影機，均能享受到ARRI為電影人所提供的統一標準：對畫質毫不妥協。也正像一百年來ARRI所做的那樣，至始自終為電影人帶來更好的工具、更好的服務。
AMIRA官方宣傳片
了解更多關於ARRI攝影機的信息，請點擊以下連結：
AMIRA：無所不往，無所不能
輕便緊湊型攝影機ALEXA MINI
ALEXA SXT全新特性 —— 百尺竿頭，更進一步
ARRI Cameras - Best Overall Image Quality with No Compromise
The same image sensor employed in AMIRA, ALEXA Mini and ALEXA SXT cameras provides filmmakers with the best overall image quality.
Since the introduction of the legendary ALEXA Super 35mm digital camera in 2009, ARRI has devoted a century of experience and excellence in motion picture technologies to developing the ALEXA camera platform, and to achieving one goal – best overall image quality with no compromise.
It’s been 8 years by now and ARRI’s digital camera lineup has grown bigger than ever before, with models including large sensor ALEXA65 used in high-end feature films, versatile and feature rich ALEXA SXT, compact and lightweight ALEXA Mini as well as AMIRA that revolutionized TV industry. Their unrivaled image quality with no compromise has been widely acclaimed by camera crews shooting TV show, commercial and feature film around the world. With extensive industry recognition and support, ALEXA has become the gold standard for image acquisition and five years in a row from 2012 to 2016, every film to win the Academy Award® for "Best Cinematography" has been captured with ALEXA. These honors and recognitions will keep driving ARRI forward in advancing digital imaging technologies.
With 12 Oscar nominations under his belt, cinematographer Roger Deakins had this to say:
「I think ALEXA is the best system out there, with different camera models and recording options to choose from, all offering – to my eye – the highest image quality.」
—— Roger Deakins CBE, ASC, BSC
However, ARRI’s success is built upon decades of hard work and painstaking effort. ARRI initiated research in digital technologies as early as in the 90s and subsequently developed ARRILASER/ARRISCAN systems as well as D-20/D21 digital cameras. Over the years from these projects ARRI has accumulated a vast amount of experience in imaging science, sensor technology, software development and manufacturing process, combined with the meticulous work from ARRI’s top engineers, it eventually led to the arrival of the ALEXA camera platform. These achievements all start from a sensor that’s shared among a number of ARRI cameras.
ALEXA SXT, ALEXA Mini and AMIRA are all equipped with the same custom developed 3.4K ALEV III CMOS sensor with Dual Gain Architecture that provides filmmakers with the best overall image quality consistent across different camera models. Measuring 28.17mm x 18.13mm, this unique image sensor is slightly larger than standard Super 35mm film, combined with an off-chip A/D converter design and the sensor's 3.4K horizontal photosite count deliver unusually large photosites for an optimal balance between image sharpness on the one hand and high dynamic range, high sensitivity and a low noise floor on the other, resulting in the best overall image quality for HD, 2K, 4K UHD and 4K Cine deliverables.
In addition, the Dual Gain Architecture simultaneously provides two separate read-out paths from each pixel with different amplification. Both paths feed into the camera's A/D converters, delivering a 14 bit image for each path. These images are then combined into a single 16 bit high dynamic range image before being encoded to ARRIRAW or ProRes files at up to 12bit. ALEXA camera platform is therefore uniquely suited to the creation of content for emerging HDR (High Dynamic Range) display technologies. Since ALEXA SXT records a WCG (Wide Color Gamut) signal larger than any current displays can show, its images are ready for new color space standards like Rec 2020. It’s very clear that every aspect of this image sensor design reflects ARRI’s pursuit of the best overall image quality with no compromise.
For all of the ARRI cameras equipped with this sensor, whether it’s the compact and light weight ALEXA Mini with carbon fiber housing, or feature rich workhorse ALEXA SXT, or ENG style AMIRA designed for handheld shooting, every one of them is capable of more than 14 stops of dynamic range and offers filmmakers with consistent high quality images.
Among these cameras, ALEXA Mini is a versatile additional tool in the ALEXA camera range. Designed for specialized shots and for working with gimbals and drones, the ALEXA Mini perfectly complements a full ALEXA shooting kit and allows crews to keep everything within a single system. It combines a compact and lightweight form factor with the same unparalleled image quality from ALEXA and has become another reliable tool for production crews around the world.
As an upgrade to ALEXA XT, the all new ALEXA SXT is the latest addition to the ALEXA camera range. While keeping the 3.4K ALEV III sensor and user interface of the original ALEXA design, it is equipped with the powerful electronics and sophisticated image processing of the ALEXA 65. The combination of the best overall image quality and unequalled workflow efficiency have greatly extended the capabilities of ALEXA SXT cameras, which also help owners maximize Return on Investment.
As one of the highlights, ARRI proudly introduces AMIRA, a versatile camera with an ergonomic design optimized for single-operator use and extended shoulder-mounted operation. Although AMIRA is separate from ALEXA camera range and targets at different usage scenarios. It still features the same sensor and exceptional image quality as the ARRI ALEXA.
Like ALEXA SXT and ALEXA Mini, AMIRA is equipped with the same custom developed 3.4K ALEV III CMOS sensor with Dual Gain Architecture with more than 14 stops of dynamic range. The unusually large photosites and Dual Gain Architecture enable AMIRA to capture virtually noise-free low light images and retain rich details even in the brightest scenes. Not only does AMIRA share the same exceptional image quality as ALEXA, it also features high frame rate shooting at up to 200fps with no crop or quality loss.
AMIRA can accommodate all types of productions from TV shows, low budget feature films, nature documentaries, live events, commercials to news broadcast and multi-cam live TV. Especially in handheld shooting and single operator use scenarios, which are what AMIRA』S ergonomic design is optimized for. For projects that require minimal setting up or rigging, AMIRA’s high dynamic range enables cinematographers to handle any challenging scene with ease. In addition, not only would low budget productions benefit from AMIRA’s reliability, the same image quality as ALEXA as well as affordable and efficient CFast 2.0 workflows, it’s also an ideal and economical choice for B cameras on bigger productions.
Of course, all ARRI cameras including AMIRA share the same standard ARRI strives for – best overall image quality with no compromise. For the past century, ARRI has been and will always be dedicated to offering filmmakers the very best tools and services.
AMIRA Showreel
For more information about ARRI cameras, please click on the following links:
AMIRA
ALEXA mini
ALEXA SXT