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Most of Canon’s digital SLR cameras, like the Digital Rebel / 450D and the 20D/30D/40D, use a similar APS-C size to other manufacturers - but the Canon EOS 1D Mk II and III use a slightly larger APS-H size sensor and the Canon EOS 1Ds Series and Canon EOS 5D use full 35mm film sized chips.
Where possible, I intend to test all Canon and Canon fit, lenses with the two main formats. Edge performance and vignetting - darkening in the corners - aren’t such a big deal with the smaller sensor but are very important with the full 35mm size sensors. So results for the same lens can be very different. Unfortunately there does seem to be a downside to bigger sensors. The problem seems to be extreme levels of vignetting or darkening in the corners, and low levels of sharpness at wide apertures with the very wide angle lenses these cameras encourage you to use again. So is there a problem?
Canon EOS 5D Image Quality
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