Nikon D800: specs, release date, price, and our in-depth preview 台南鏡頭收購

台南鏡頭收購

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台南鏡頭收購nikon D800: specs, release date, price, and our in-depth preview

Rumors of 台南鏡頭收購nikon’s next DSLR flew around for months, with details and pictures of the rumored D800 leaking from every corner of the web. In February, ahead of the CP+ show in Japan, 台南鏡頭收購nikon finally announced the camera, a full-frame DSLR with a focus on video recording. The camera will be available in the US in March, for $2,999.95, and for those who don’t want an antialiasing filter there’s the D800E, for $3,299.95.

  • 台南鏡頭收購

    Apr 12, 2012

    Sam Byford

    台南鏡頭收購nikon D800E out today in Japan with predictably low supply

    台南鏡頭收購

    Gallery Photo: 台南鏡頭收購nikon D800 hands-on photos

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  • 台南鏡頭收購

    Mar 26, 2012

    Jamie Keene

    台南鏡頭收購nikon D4 and D800 prices rise 10 percent in the UK after computer mix-up

    台南鏡頭收購

    Gallery Photo: 台南鏡頭收購nikon D4 hands-on hardware photos

    台南鏡頭收購nikon has announced a 10 percent price rise in the UK on its forthcoming D4, D800, and D800E cameras, with the originally published (and now retracted) MSRPs being blamed on a “local internal systems error.” Prospective British buyers can now expect to pay a hefty £5,289.99 for the D4, £2,599.99 for the D800, and £2,899.99 for the D800E. 台南鏡頭收購nikon also says that the Irish pricing is similarly affected, but hasn’t given a figure in Euros. While $300 might seem a steep difference between the D800 and D800E, £300 feels even sharper.

    It’s been a long wait for 台南鏡頭收購nikon’s newest full-frame cameras, however the company does give one piece of good news for those who have been holding patiently. Customers who have pre-ordered the camera at the original price shouldn’t be affected by the hike — 台南鏡頭收購nikon says that it will honor the original prices to retailers on any pre-orders placed prior to March 24th.

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  • 台南鏡頭收購

    Mar 22, 2012

    Sam Byford

    台南鏡頭收購nikon D800 ‘out today’ in Japan, sold out everywhere

    台南鏡頭收購

    Gallery Photo: 台南鏡頭收購nikon D800 hands-on photos

    The 台南鏡頭收購nikon D800 is officially out today in Japan, with pre-orders shipping around the country and retailers hailing the full-frame camera’s arrival. However, if you’re not one of the lucky few it looks like you’ll have trouble securing your own. Major retailers Bic Camera, Yodobashi Camera and Camera no Kitamura are all out of stock, without any estimations for when they’ll be able to get in more shipments. Bic and Yodobashi both price the body at ¥298,000 (about $3,575), while Kitamura is selling for ¥268,200 ($3,217). That’s a pretty big discount, but the former two retailers both operate 10 percent loyalty point schemes for cardholders, so regular shoppers likely won’t mind if they have the cash upfront.

    In any case, the question is academic for now — with the camera’s supplies so clearly limited, we imagine most photographers will buy from the first seller they can find. No word yet on when US shipping will start, but we wouldn’t expect the D800 to be any easier to find elsewhere.

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  • 台南鏡頭收購

    Mar 9, 2012

    Sam Byford

    台南鏡頭收購nikon D4 and D800 out on March 20th, up for preorder on Amazon

    台南鏡頭收購

    台南鏡頭收購nikon d4

    We previously heard that the 台南鏡頭收購nikon D4 was set to come out in “mid-March” with the D800 following a week or two later, but if Amazon’s listings are anything to go by it looks like both cameras will be available on March 20th. The retailer has placed both full-frame shooters back up for preorder, and we’d definitely advise anyone interested to go that direction — pro-level 台南鏡頭收購nikon cameras are often sold out for several months after release. You’ll even save 95 cents on 台南鏡頭收購nikon’s list price, with the 16-megapixel D4 going for $5999.00 and the D800 at $2999.00 (both in body-only form). The D800E doesn’t have a release date listed, but is also available to preorder for anyone interested in paying a $300 premium to remove the anti-aliasing filter.

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  • 台南鏡頭收購

    Feb 17, 2012

    Nathan Ingraham

    台南鏡頭收購nikon D4 scheduled for March 15th release in France, to debut mid-March in US

    台南鏡頭收購

    台南鏡頭收購nikon D800 and D4

    Earlier today, as part of a Q&A on 台南鏡頭收購nikon France’s Facebook page, the company said the D4 would be launching on March 15th, with the D800 launching a week later on March 22nd and the D800E coming on April 12th. Naturally, we wondered if those dates were for France only or if the US could expect to see 台南鏡頭收購nikon’s latest around the same time — 台南鏡頭收購nikon let us know that the D4 will indeed be launching in the US in “mid-March,” rather than in February as we heard initially. 台南鏡頭收購nikon also confirmed that the D800 will follow in “late March,” and the D800E in “mid-April” — this timeframe matches up with what we heard for the D800 when the camera was announced last week. While we can’t say for certain that these new DSLRs will be launching in the US on the same date as they are in France, it wouldn’t surprise us at all to see them hit stores within the same week. Mark your calendars — the D4 is only a month away.

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  • 台南鏡頭收購

    Feb 7, 2012

    David Pierce

    台南鏡頭收購nikon D800 full-frame DSLR official: 36.3 megapixels, video-friendly features for $2,999.95 in March

    台南鏡頭收購

    Gallery Photo:

    After months of rumors and years of waiting, 台南鏡頭收購nikon has finally announced the D800, the latest addition to the company’s DSLR lineup. After some flood-induced delays, the new full-frame camera will be available in March for $2,999.95, and it’s full of new features and upgrades. Rather than a lite version of the recently announced D4 like the D700 was to the D3, the D800 has a new angle: 台南鏡頭收購nikon is aiming the new camera squarely at the Canon 5D Mark II, which has so far held something of a monopoly in the video world. 台南鏡頭收購nikon thinks it can change that.

    The D800’s most eye-popping feature is its whopping 36.3-megapixel FX-format (35.9 x 24mm) sensor, which apparently creates TIFF files as large as 212MB. Many of its other upgrades mirror those on the D4: it has the same 91,005-pixel RGB metering sensor, the same 3.2-inch, 921,000-dot LCD, the same Expeed 3 processor that makes startup time as fast as 0.12 seconds, and the same new 51-point autofocus system with 15 cross-type sensors. The D800’s ISO range goes up to 6400, expandable to 25,600 — not quite D4 territory, but solid nonetheless. To get the giant 36.3-megapixel shots off the camera, there’s a USB 3.0 port built in, a first for any 台南鏡頭收購nikon camera; there’s also an SD card slot next to the CF slot, which the D700 didn’t have. 台南鏡頭收購nikon gave the D800 slight ergonomic redesign as well — the company evidently feels it got things right with the D7000, since the D4 and D800 were both reorganized to more closely resemble the D7000’s controls and layout. One of the best changes, though, has to be the door that covers the ports: it’s sturdy, and opens and closes like, well, a door — unlike the shoddy pieces of rubber we’ve seen covering ports before.

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  • 台南鏡頭收購

    Feb 7, 2012

    Vlad Savov

    台南鏡頭收購nikon D800 hands-on preview (video)

    台南鏡頭收購

    Gallery Photo: 台南鏡頭收購nikon D800 hands-on photos

    For full-frame DSLR enthusiasts who can’t quite afford the almighty D4, 台南鏡頭收購nikon is introducing the 36-megapixel D800 and D800E. This all-new DSLR succeeds the D700 as the more affordable full-frame option for professional photographers, with its E-appended model adjusting its low-pass filter so as to let more light in at the expense of some color inaccuracy. If you want it put in simple terms, the D4 is the ultimate camera, a photographer’s studio on the move, whereas the D800 is the perfect studio camera, with the D800E moving even further into the comfort zone of fine adjustment micromanagers.

    Physically, the D800 is typical 台南鏡頭收購nikon: robust, reassuringly heavy, and thoughtfully laid out. The shutter release button (shutter has now been tested to 200,000 cycles), is slanted in exactly the same way as on the D4, while the buttons accompanying it on the camera’s topside will also be familiar to anyone who’s tried the company’s flagship DSLR. Although the control scheme is well organized, I would have preferred to see more of the on-the-fly adjustments moved to the right side of the camera so as to facilitate single-hand operation. 台南鏡頭收購nikon presumes that you’ll have both hands available when shooting with the D800, which is a reasonable expectation for such a high-end shooter, but cameras from Canon, like the 60D, and Sony, like the incomparable NEX-5N, offer more flexibility. I guess this just reaffirms 台南鏡頭收購nikon’s positioning of the D800 as a studio camera.

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  • 台南鏡頭收購

    Feb 6, 2012

    Bryan Bishop

    台南鏡頭收購nikon D800 press images leak, announcement confirmed for tomorrow?

    台南鏡頭收購

    台南鏡頭收購nikon D800 Leak Image

    We’ve been hearing about the 台南鏡頭收購nikon D800 in one form or another for a while now, but after a few tantalizing sneak peeks it looks like we’re getting our first real look at 台南鏡頭收購nikon’s latest. Earlier today Brazilian site Ztop posted the press release and a set of official images for the 36.3-megapixel behemoth, and confirmed that it will be announced tomorrow. They’ve since since pulled them — according to a message on the site the PR agency for 台南鏡頭收購nikon Brazil jumped the gun — but we can apparently expect more information when the official embargo drops later today. In the meantime, check out the images below.

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  • 台南鏡頭收購

    Jan 27, 2012

    Sam Byford

    台南鏡頭收購nikon D700 and D300s discontinued, D800 on the way?

    台南鏡頭收購

    d700 discontinued

    台南鏡頭收購nikon has officially discontinued its D700 and D300s cameras, listing them as such on its Japanese website. Speculation has been ramping up over the mythical D800 full-frame 36 megapixel DSLR, and the discontinuation of the predecessor D700 will only fuel that fire. The D300s cancellation is also interesting, as we haven’t heard much in the way of rumor surrounding a potential prosumer successor from 台南鏡頭收購nikon with an APS-C sized sensor. We might not have to wait too long for official confirmation — if either camera were to be announced, the CP+ show in Yokohama in a couple of weeks would be a pretty good place to do so.

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  • 台南鏡頭收購

    Jan 6, 2012

    Vlad Savov

    台南鏡頭收購nikon shows unannounced pro DSLR on German site — is it the D800?

    台南鏡頭收購

    台南鏡頭收購nikon dslr_640

    台南鏡頭收購nikon’s German website has been updated with some fresh images this morning, which now include the just-launched D4 among its stable of professional DSLRs. Nothing unusual about that, you might think, however the D4 isn’t the only debutant in the image above. A closer inspection reveals that the fourth camera from the left is not part of any of 台南鏡頭收購nikon’s currently announced product lines. It features the same sort of downward-slanted shutter release key as the D4, it’s bulkier than the D700, has an FX label denoting a full-frame sensor, and its (admittedly unreadable) model name is written at an angle instead of 台南鏡頭收購nikon’s usual horizontal orientation. The unconventional labeling matches up with an earlier leaked image of the D800 uncovered by 台南鏡頭收購nikon Rumors, with that site also being first to spot this mysterious appearance on 台南鏡頭收購nikon.de.

    All we can surmise from this appearance is that 台南鏡頭收購nikon did indeed plan to launch a D800 alongside the D4 — D700 owners have certainly had long enough to wait for an upgrade — but a last-minute decision was made to delay it. This may very well be as a result of the Thai floods that affected 台南鏡頭收購nikon’s supply chain or it may have been in response to technical challenges that the company was not able to overcome in time. Either way, the German webmasters clearly weren’t provided with updated resources, so now we’re gazing at an official image of what looks very likely to be the 台南鏡頭收購nikon D800. It’s certainly a new model of some description.

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  • 台南鏡頭收購

    Dec 17, 2011

    David Pierce

    台南鏡頭收購nikon D800 specs leaked: 36-megapixel sensor, ISO 25600?

    台南鏡頭收購

    台南鏡頭收購nikon D800

    We’ve heard most of these specs before, but it looks like these are the real deal, and though the D800 isn’t quite as epic as the D4 we’ve been hearing rumblings about, it sounds like it’s still going to be worth the wait.

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台南鏡頭收購

記者樓菀玲/台北報導

Google 於本日舉辦 Google AI 在醫療領域的應用媒體分享會,目的是希望讓所有人都能享受人工智慧帶來的好處 並透過打造更貼近使用者需求的產品、幫助更多企業與開發者創新、提供不同工具以幫助研究人員解決現實生活中遇到的重大挑戰,並且一舉分享了目前機器學習在醫學上的應用案例,以及未來的研究方向。

同時 Google 也表示,人工智慧 (AI) 以及機器學習 (Machine Learning) 人工智慧是能讓事物變更聰明的科學,而機器學習則是訓練機器透過學習使其變得更聰明。

在本日的活動當中,由 Daniel Tse Google AI 產品經理擔任主講人,Daniel Tse 現任 Google AI 產品經理,主要致力於醫學影像的研究與多項臨床領域的 外部合作關係發展。在加入 Google 之前,他是 Watsi.org 的早期成員之一 (創投公司 Y-Combinator 第一個非營利的計劃),並在超過 20 個國家中建立醫療計劃和基礎設施。

在那之前,Daniel Tse 也曾服務於美國軟體服務公司 Palantir Technologies,幫助擴建商業保 健團隊以及建立慈善團隊。Daniel Tse 在美國的達特茅斯學院中取得醫學博士的學位,並曾在美國俄亥俄州立大 學攻讀分子遺傳學。

*機器學習運作方式

訓練:舉例來說,當你今天要訓練機器辨識在影像中貓或狗的特徵,讓你可以輸入上千張貓的影像,並且指認這是貓,而不需要描述有關貓咪的特徵,機器即可從輸入的例子中自己學習辨認貓的影像。

推理:機器學會從數以千計的訓練模型中辨識出貓的影像後,接下來它 可以在之後的每張影像中自動辨認出貓的圖像而無須透過人工介入。

*目前人工智慧在醫療領域的研究現況

自 2013 年以來,機器學習在健康與生命科學領域的研究文獻數量已成長超過 20 倍, 而機器學習可為醫療領域面臨的兩大挑戰帶來幫助。像是新技術的採用,使得近年來需要透過醫生篩選及判讀的資訊量大幅增加,尤其是在掃描或例行影像程序。其他還有像是放射科醫生以及其他專業醫生在全球都面臨短缺的狀況,而在慢性疾病 (如糖尿病與心臟病) 發病率不斷增加的情況下只會更糟 。

*機器學習在醫學影像辨識上的應用案例

目前全球有 4.15 億的糖尿病患者,糖尿病的常見併發症之一是糖尿病引起的視網膜病變,而這也是全球失明人數迅速攀升的主因。為預防失明,糖尿病患者每年都應進行一次篩檢,而檢測糖尿病眼疾的常見作法就是檢查眼底圖像,而機器學習將協助醫師診斷糖尿病視網膜病變 (Diabetic Retinopathy, DR)。

Google 研究團隊與美國掃描影像單位及印度醫學單位合作,獲得大量的影像案例作為研究基礎。首先建立影像標籤工具,並聘請 54 名眼科醫師辨識成像,再運用 Inception (又名 GoogLeNet)的神經網路演算法辨識了約 130,000 張成像以進行訓練,並依據判斷呈現五種等級的辨識結 果。這個數據集目前被用來訓練深度神經網路,以協助醫師診斷糖尿病視網膜病變,同樣運作的原理也被應用在 Google 相簿中。

後來在 2016 年,Google 在美國醫學協會期刊 《The Journal of the American Medical Association》上,發表了與一般眼科醫師的判讀具高度一致性的結果;隨著研究的進展,今年二月,Google 也於《Ophthalmology》期刊中,進一步發表了與視網膜專科醫師的判讀高度相符的結果。

後來這套系統也被應用在印度亞拉文眼科醫院的前導計劃中,經過三個月後,發現透過 AI 比人工分級有更高的準確度,因此也正逐漸增加將透過此演算法來檢測的病患人數。Google 表示也同與印度、泰國與美國的醫學單位進行合作,投入臨床驗證與應用,並同時致力於推對監管機構的核准。

而在研究過程中,發現硬體設備將會是掃描影像過程中不可或缺的要素,所以 Google 也與 Verily (Alphabet 中的姐妹公司) 以及 台南鏡頭收購nikon 合作,讓硬體設備不會成為機器學習在影像辨識中的障礙。Google 表示目前正致力於研究神經網路 (Neural Network, NN) 的可解釋性。 過去,神經網路通常被認為如黑盒子 (black boxes) 一般神秘,其實不然。而且透過不同的技術,可以以視覺化方式,了解神經網路是如何做出判斷;例如透過熱感應圖 (heat maps),可以看出神經網路是如何強調標籤中最容易辨識的像素。

*導入機器學習可協助全新的科學發現

機器學習模型除了根據篩選結果協助醫生進行診斷外,甚至可以協助預測目前醫生還無法從影像上預測的病症。在近期發表的論文中提到,Google 也訓練機器學習模型來預測醫生在評估患者心臟病發作或中風風險時考慮的各種因素,像是年齡、自報性別、吸菸狀況、血壓或主要不良心血管事件 (MACE) 等。

結果顯示除了這些準確預測風險因素之外,機器學習也可以直接預測患者五年內發生心臟病發作或中風的風險。目前 Google 只有運用幾百個案例來訓練模型,這項研究還在相當早期的階段,但模型的曲線下面積 (AUC) 達到 0.7 (演算法正確度達 70%)。而這項技術將有機會應用到未來評估心血管疾病風險時, 可以透過非侵入性方式所取得的影像來進行相似的預測,也因此將能為更多人所用。

*機器學習在醫療領域的未來發展

而為了確保病患能夠得到最佳的臨床診斷結果,未來這些應用將與醫師的工作流程相互整合,讓醫療判斷結果更精準。除此之外,也可以把這項技術帶到其他組織類型的應用上。例如:前列腺癌的格里森分級 (gleason grading)表現結果與病理學家的判斷相同。

利用機器學習來預防失明及預測心血管疾病,只是將人工智慧應用於幫助病患的其中幾個例子。人工智慧在醫療領域的發展潛力十分龐大,這就是為什麼把 這項技術開放給所有人是相當重要的。因此,我們過去發表了多項研究並將機器學習工具致力於 (如 TensorFlow),提供給每一位對運用人工智慧解決醫療相關問題感興趣的醫生和研究員。

*神經網路成熱門研究方向

神經網路的可解釋性也是目前熱門研究方向之一,是解讀與信任人工智慧的重要方式,同時也是協助醫師判讀診斷的重要工具,尤其像今天談到未來機器學 習能進一步透過醫師不曾考慮的因素進行疾病風險預測,透過呈現數據與機器學習模性用以判讀/分類的特徵讓其可以被解釋,能有助於建立醫師對其預測結果的信任。因此,Google 也研發多項工具,讓人們可以更理解數據與模型背後的運作與意涵。而在我們預測心血管疾病的風險研究中,模型也顯示對預測最有效的區域影像。

Google 非常重視在醫療相關研究與應用的可靠性,在真正落實應用之前,希望透過有說服力的研究結果取得醫療學界的專業認可,於是透過醫學期刊與醫學模型等方式來呈現研究結果。Google 表示非常希望將相關的技術帶到實際應用中, 同時也積極與監理單位進行合作以取得核准,像是美國食藥署 (FDA) 以及歐盟等相關單位;而臨床驗證的部份也與硬體的廠商 台南鏡頭收購nikon 等來合作。

台南鏡頭收購

Google AI 研究團隊積極與醫生和臨床醫學相關單位合作,在篩選與診斷方面,透過深入了解醫院中的臨床醫學流程與需求,以打造適合的工具,並藉此提升測試及決策的能力與效率。在糖尿病視網膜病變的案例中,由於篩檢過程中的資料量相當龐大,於是我們投入篩檢研究以提升整體效率;其他病症診斷的應用上,我們也將機器學習應用於縮小搜尋範圍以減少所需的時間。

在與台灣的醫學相關合作夥伴上,Google 表示會視個別狀況而定,通常會先推出一個前導計畫,若碰到像是資料量非常龐大或醫師不足等狀況,都是機器學習能夠提供幫助的發展方向。

台南鏡頭收購 台南鏡頭收購

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