In your EF-S 18-135 review you mentioned that some EF-S cameras can internally correct for lens defects like CA. Is the T3i one of those? How do you find out? Where your sample 18-135 photos RAW or JPEG? Would the camera have automagically compensated the JPEGS?
I need to go back and check (and possibly correct) that review. As far as I know only vignetting correction is available in-camera (it can be turned on or off). While CA and distortion correction are available in DPP for RAW files, as far as I know they have not yet been implemented in-camera (though there is no reason why they couldn't be and I wouldn't be surprised to find that as a new "feature" on some future EOS models). The 7D also just has vignetting correction as an option. I think a number of P&S cameras probably apply such (CA, distortion, vignetting) correction to their JPEG images, though it's hard to tell since manufacturers tend not to publish such technical details for their P&S models.
Any test images would have been shot without vignetting correction applied. Unless otherwise stated, my test images do not have CA or distortion correction applied either. Typically they are default JPEGs unless otherwise stated.
Thanks, Bob. It is funny, 'cause Nikon has been correcting for CA for a long time.
The relevant sentance is: "Canon's DPP software to process the images. DPP provides the ability to correct vignetting, distortion and chromatic aberration. Most recent APS-C DSLRs can also perform these corrections in-camera"
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