Image Quality and Noise
The 50D adds 5 megapixels to an APS-C sized sensor (compared to the 40D), and as a result the size of the individual photosensors has decreased. To offset the increased noise that inevitably results from smaller photosensors, Canon eliminated the gaps between the microlenses covering the photosensors. Thus the microlenses are larger, and capture more light and direct it to the sensor sites.
Read more about this topic: Canon EOS 50D
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