@ell wrote:
o記在很多方面,都等於canon在03年出的300D一樣
5年後的科技,出的機子竟然是這個樣子....
http://www.dxomark.com/index.php/eng/Image-Quality-Database/Compare-cameras/(appareil1)/182|0/(appareil2)/221|0/(appareil3)/220|0/(onglet)/0/(brand)/Canon/(brand2)/Olympus/(brand3)/Olympus
按照這種標準來看的話,5 年後的 450D 科技一定很讚了,看看吧,哈哈...
http://www.dxomark.com/index.php/eng/Image-Quality-Database/Compare-cameras/(appareil1)/182|0/(appareil2)/185|0/(appareil3)/220|0/(onglet)/0/(brand)/Canon/(brand2)/Canon/(brand3)/Olympus
所以這個結果也可以這樣說... Canon 5 年後出的科技,居然跟 03 年出的 300D 沒多大差距。對吧...
當然 4/3 的高 ISO 目前是弱點不否認,不過有興趣的也可以點 ISO Sensitivity 看看數據
450D 的 ISO 灌水蠻嚴重的...
ISO400 實際只有 303
ISO800 實際只有 606
ISO1600 實際只有 1165
以上都是以 Dxomark 來看,相不相信這個數據又是另外一回事了。
結論:資訊只看片段,就會被曲解
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echoesvet wrote:
照 ISO Sensitivity 圖來看,這是450D 贏很大巴...
請看一下 DxOMark 的 ISO Sensitivity 定義:
ISO Sensitivity indicates how sensitive the camera sensor is with respect to light. In terms of exposure, the higher the ISO sensitivity, the better, as less light is needed to make an exposure. However, increasing the light sensitivity (from analog or digital gain amplification) also increases the image noise. On this graph we compare manufacturer-provided ISO number (indicated in the image's Exif), versus the DxO Labs measured ISO (as defined in the ISO #12232 standard). ISO Sensitivity is also referred to as ISO Speed.
以 450D 舉例:
Canon 標示的 ISO 1600(manufacturer-provided ISO)
由 DxO 實驗室測得的 ISO 只有 1165(DxO Labs measured ISO)
所以這是指 ISO 灌水,而不是數字比較低所以雜訊比較低的意思。
附註:DxO 的數據很多人質疑,而且它又賣軟體,很難讓人不會聯想到商業利益。
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