常常看到討論，7D和550D是用相同感光元件，但卻又發現dprview裡介紹550D有提到
18.7 megapixel CMOS sensor
The 550D uses a new, 18.7 (total) megapixel sensor that's similar, but not exactly the same as (according to our sources at Canon) the one featured in the 7D.----摘自dprview.com
說的有點保守，但如果真的不同，那有沒有人知道是差在哪呢？
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