pipi5867 wrote:
關於感光元件 有小道...(恕刪)
只要不再是P牌
啥牌都ok
再怎麼爛 也會比那萬年的 1200萬好
pipi5867 wrote:
關於感光元件 有小道消息指出是sony 越來越有趣了
http://digicame-info.com/2012/03/om-d-e-m5-5.html#more
寫真迷上有提到這個八卦：
http://photofan.jp/camera/html/modules/newbb/viewtopic.php?topic_id=8484&forum=45&post_id=82077#forumpost82077
這句我覺得最有趣：
Olympus負責畫像處理的工程師，
對田中先生說了一個比喻來形容他的興奮:
「以前沒錢，一直過著很節拘的苦日子。
有一天收入增加到可以過一般生活時，
因為習慣以前的窮日子，
反而不知道要將這些多出來的錢怎麼用，才能過好日子。
」
看完，其實我心底也有些感觸：
「以前機身的性能趕不上時代，只能邊磨練技術、邊告訴自己「不要鞭太用力，罵小聲點就好」
有一天相機的性能，提升到已經跟得上正常的水準時
因為習慣過去的鳥蛋規格
反而不知道該說什麼…」
如果一年半前的E-5上用的是這片，那該有多好…畢竟，這並非什麼很苛求的條件，作為當代的4/3旗艦，E-M5這樣的性能，其實是當時理應能到達的水準…
另外，如果Olympus真的不知道這「多出來的錢該怎麼用才能過好日子」的話，那我告訴你，想辦法讓E-M5能無瑕接上所有的4/3鏡，那就是我目前所能想到，最好的日子。
alphones wrote:
不管是上市兩年的60D，還是上市三年的5D2，以這類型產品的生命週期來看，比起E-M5來說，都已經是祖父跟曾祖父級的產品了…...(恕刪)
5D II:我還沒當阿公,阿公是5D,5D III要叫我爸爸.
先天的差異沒辦法改變, E-M5畫質表現能夠接近追上目前的領先群已經算不錯了(以前只能投降輸一半).
zakkwang wrote:
當實際使用面的曝光值可以差到2/3ev
同級iso表現如何就沒有參考價值了
(因為別人用較低iso值就有同樣快門速度)
...(恕刪)
Dpreview討論串
有人同樣對對其它相機用較低iso值就有同樣快門速度有疑慮.
截錄Dpreview測試人員的解釋:
We don't randomly change the light levels between cameras on a whim. But we have changed the lighting setup recently to one that gives us more control, and lets us dim the lights when testing cameras with very high ISO settings. For the purpose of the test, this simply doesn't matter - it doesn't have to be done at a fixed light level because, by a happy accident of design, cameras can compensate for differing light levels by using different shutter speeds.
The purpose of the studio comparison widget is to compare how cameras behave in terms of noise and noise reduction at different ISOs. To this end, the exposure is tightly controlled between cameras, based essentially on the SOS definition of ISO 12232:2006. This is the definition used used by camera manufacturers. DxOMark uses a different measure which may, or may not, give the same answer, depending on the camera.
For the purposes of our testing ISO defines the relationship betwen exposure (as a function of light level, shutter speed and aperture) and JPEG image brightness. If two cameras have the same SOS ISO calibration, and output JPEGs of the same brightness, they must have received the same exposure, regardless of the actual light level. Any differences in light levels can be compensated by changing the shutter speed. This is how cameras work. Our tests are based on setting the exposures so that specific reference gray patches are white-balanced and rendered at the same brighness from every camera (as far as possible).
Shutter speeds have absolutely minimal impact on noise. If you shoot the same scene at ISO100 1/125sec F16 and ISO100 1/2000sec F4 you really won't see any difference in the noise. To me this is so self evident from everyday shooting I'm actually quite surprised to find myself typing it here. Then again, I did spend several years of my life testing lenses, so I guess have a bit more experience of this than most.
DxOMark's ISO measurements are fine in their own way - they provide a logical framework for DxOmark's own particular method of RAW data comparison. They just bear no relation to our tests based on SOS ISO - the two simply don't intersect. You can't say our ISO tests are wrong because DxO's are different, and you can't reinterpret our data based on DxOMark's measurements. The two testing regimes just use entirely different methodologies.
Dpreview測試快門速度不同是因為燈光設定改變.
VICCHEN2006 wrote:
Dpreview討論...Dpreview測試快門速度不同是因為燈光設定改變.(恕刪)
第一段不是這個意思。
他是在強調，他們"並沒有"在測試不同相機時，隨意變更照明亮度。
但是，他們曾更新過照明設備，新設備可以在測高ISO時降低亮度。
這篇文章的出現，起因於論壇有人質疑：
何以dp直接採信廠商給的ISO值，而不做DxO那種真實ISO的測試。
這讓dp內部人員不得不數度發言回應。
他們的解釋是，DxO是以Raw檔為基礎，但dp認為一般人習慣用JPEG，
所以他們認同業界標準：ISO以JPEG image brightness為準。
簡單講，
Dpreview不想碰ISO灌水這個潛規則，
所以就像第一段那樣，關於測試圖的光圈快門能不能拿來判斷ISO灌水，
他們只給了個ambiguous的答案。
http://www.imaging-resource.com/PRODS/EP3/EP3IMAGING.HTM
http://www.imaging-resource.com/PRODS/DMCG3/DMCG3IMAGING.HTM
http://www.imaging-resource.com/PRODS/NEX5N/NEX5NIMAGING.HTM
G3跟E-P3在同樣光照環境、同樣ISO設定下，總曝光量是比較多的。
| ISO3200 | 11 lux | 5.5 lux | 2.7 lux | 1.3 lux |
| E-P3 | 1/15s f2.8 |
1/8s f2.8 |
1/4s f2.8 |
0.5s f2.8 |
| G3 | 1/15s f2.8 |
1/8s f2.8 |
1/4s f2.8 |
0.5s f2.8 |
| NEX5N | 1/20s f2.8 |
1/10s f2.8 |
1/5s f2.8 |
0.4s f2.8 |
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