富士(FUJIFILM)相機虛標感光度的行為構虛假宣傳或者欺詐嗎？

12-15

眾所周知，富士的X系列相機都有嚴重的虛標感光度行為，這在http://www.dxomark.com跟國內的http://www.iRentals.com均有測量數據支持，其偏差之大居然接近兩個光圈級別，嚴重影響正常使用，另一方面給人以「高感好」的假象。
請問這種行為在法律上如何定義？造成的既成後果如何解決？富士下一步應該怎麼做？
利益相關：器材愛好者，富士潛在用戶。希望大家認真討論，不要互相攻擊

對於官方宣傳口徑就是我們APSC比全幅強的公司你還想怎樣

業界頭號吹牛逼王，用索尼淘汰下來的閹割原生iso100的殘幅CMOS的命，YY逆襲全幅的心，靠著虛標ISO+RAW塗抹忽悠智障富士粉，到處外面吹牛逼忽悠小白，jpg偏色片的連它媽都不認識，還管那叫直出色彩好，1600萬像素最低iso200的cmos實際水平就索尼已經停產淘汰下來最低端現在只賣800塊的NEX3N水平，賣的和人家A7一個價，簡直就是典型的人傻錢多速來

回復里扯一堆玄學油潤細膩智障富士吹更證明了這點，你跟富士吹說數碼相機成像原理，CMOS工作方式，畫幅，ISO變化和信噪比，動態範圍，色深的變化的關係和對畫質和解析度的影響，富士吹會完全無視你，然後跟你扯一堆玄學，你永遠別想說服一個富士吹，因為他會把你的智商拉到和他同一水平，然後用豐富的經驗打敗你

DXO的ISO sensitivity不是測試虛標與否的，你們很多人究竟看不看DXO的測試說明，究竟是懶癌晚期，還是英文水平太野雞，根本看不懂？

ISO sensitivity測試的無非廠商的ISO策略，即更偏重模擬增益還是數碼增益，就那麼簡單。至於ISO有沒有cheated，通過那個圖是反應不出來的，再說了，Fuji的大部分機器，現在DXO根本不測好么？（當然這裡絕對不是說Fuji是乾淨的）

至於怎麼測ISO cheated，很簡單，同曝光三角出JPEG比較亮度（忽略F值可能有的差異），明顯偏暗的就是作弊。

RAW ISO measures are inferior to manufacturer ISOs: is this a problem?

The RAW ISO measured value is almost always inferior to the ISO that you decided to use with your camera. Take a Canon EOS 60D, for instance. When you select ISO 200, the measured RAW ISO sensitivity is 160. At ISO 800, the measured value is 632… and so on. This simple fact compels some users to complain that the manufacturers are cheating [lying?]. Sure, this is a trick, and we are about to explain it, but it is not cheating.

ISO sensitivity compared: In grey, the nominal sensitivity. Some cameras, such as the Nikon D70 (orange dots), have a RAW ISO corresponding to the JPEG value. Many others, such as the Canon EOS 60D (red dots), have a much lower RAW ISO than the nominal value.

In fact, it is precisely the JPEG ISO value that all the manufacturers publish. They do so because JPEG (or any RGB) output is the visible output that photographers use. So when you select ISO 800 on your camera, you』ll have a JPEG ISO at 800, but the RAW ISO will be at (for instance) 550. The JPEG results are achieved by playing with the tone curve shape. This is absolutely legitimate: the ISO standard allows manufacturers to use this JPEG value. They are not cheating.

An old custom

Not cheating—okay. A trick? Maybe. The RAW-to-JPEG conversion allows cameras to achieve improved speeds, and to boost ISO values. And this is nothing new. What happens today with digital cameras also happened in the past with film cameras. When manufacturers produced an 800 ISO film, for example, they often used revamped 400 ISO film, and simply 「asked」 that it be processed differently. So when lab operators received a film labelled 800 ISO, they treated it differently (keeping it twice as long in the chemicals, for instance) in order to produce a stronger signal on the film. Digital camera manufacturers have simply implemented this same strategy in the camera body, and so could be seen as a 「good old tradition.」

Moreover, underexposing the RAW file allows manufacturers to use their own complex algorithms to obtain a better output for the highlights while retaining good medium tones.

And this is also the reason why everyone should use genuinely efficient RAW converter software.

多翻翻DXO的測試就會明白，目前絕大部分廠商都偏向比nominal ISO更低的策略，如Pa，S和N都是差1/2stop，Oly直接差1stop甚至更多，為啥呢？
原因很簡單，偏向保護highlight細節，實際上目前根本也沒多少機器的ExposureBaseline是0。
X100就是早年DXO測過的機器，超過一定程度的ISO就全部是通過數碼增益完成的，就是這麼回事。其實廠商哪怕不用模擬增益，全程數碼提亮也不叫作弊，什麼叫作弊，本文開頭已經闡明了。
ISO本質上是根本無關痛癢的東西，無非一個亮度標尺，和信噪比本身都不存在關係，廠商的ISO作弊與否說白了就是有沒有影響測光，判別準則就這麼一個而已。

@Artisan Bread
您要的亮度測試來了。（BY 蘭拓）