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Canon EOS 40D Guide to Digital Photography by David D. Busch

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Canon EOS 40D vs. EOS 30D...et al.

The EOS 40D is a significant upgrade from its predecessor, the 30D. The differences between the two models are much greater than was evident between the 20D and 30D, as the 30D was considered a minor upgrade, at best. So, I’m going to start with a quick review of the improvements that were available when the EOS 30D was introduced in February, 2006:

  • Resolution: The Canon 30D offered 8.2MP of resolution, compared to the 20D’s 6.3MP.

  • Metering: The 30D added a 3.5 percent image area “Spot” metering mode to the 20D’s complement of 35-Zone Evaluative, Partial, and Center-Weighted average metering. The 30D offered both luminance (brightness) and RGB histograms for evaluating exposure; the 20D had only a luminance histogram. ...

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