e68899 wrote:
如題比較500D與5...(恕刪)
說真的,小弟的木眼看不出很大的差異
不過兩台都很想要
dongdongchiu wrote:
50D 和 500D...(恕刪)
http://www.imaging-resource.com/PRODS/T1I/T1IA.HTM
這邊好像也有提到500D的CMOS跟50D有些不同
原文如下，有強者能幫忙翻譯一下嗎？
Sensor technology. The Canon T1i's 15.1-megapixel CMOS design is lifted from the Canon 50D, and raises the resolution from the XSi's 12.1 megapixels. The sensor and processor combination in the T1i seems to be a little better overall, producing sharper images with greater detail.
The new sensor's pixels are improved in two ways over the XSi's design: first the light-sensitive area of each photosite has been increased in size through more efficient cell design. Second, there are also now no gaps between the microlenses that sit over each 4.7µm photosite, as is shown in this Canon 50D graphic; Canon calls them "gapless" microlenses. Judging from our test images, Canon has indeed managed to improve image quality while raising ISO and increasing resolution at the same time.
Where the T1i's sensor differs is in the data path: whereas the 50D's sensor has a four-channel readout, the T1i's sensor uses a 2-channel readout, which means that the image data will come off the T1i's sensor more slowly. Since the T1i has a slower framerate, the four-channel readout may have been deemed unnecessary.
Where the T1i's sensor differs is in the data path and the microlens array: whereas the 50D's sensor has a four-channel readout, the T1i's sensor uses a 2-channel readout, which means that the image data will come off the T1i's sensor more slowly. Since the T1i has a slower framerate, the four-channel readout may have been deemed unnecessary. As for the microlens array, we initially assumed that is was the same as the 50D's gapless microlenses, as we were told that the only difference between the two sensors was the data path; now it seems that the microlenses in the T1i's sensor do indeed have "gaps," which should mean that the sensor will let in less light overall. We'll have to see how it does in our low light tests, but the T1i's beta sensor still looks remarkably close to the 50D's.
新的內容說明這是有gap的CMOS sensor。跟dongdongchiu提供的影片訪問內容一致。
在這篇報導中，提到500D的抹雜訊技術也走向Nikon方式。500D（左）與450D（右）在ISO 1600相比，可以看到500D在低對比區抹掉更多的細節，導致紅布上的圖案細節不如450D。但是作者也提到，畫質衰退發生在ISO 1600，ISO 800或以下，500D表現的不錯。
看來，50D要嘛更新韌體，要嘛在DPP中優化雜訊處理，就可以達500D的雜訊處理效果。
不要小看太陽餅國的男人啊！http://myg9.blogspot.com/
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