Color depth refers to the number of unique colors that a sensor can faithfully capture. Cameras with better color depth will demonstrate smoother transitions from one color to the next, and avoid "banding" in areas with subtle shading. (Blue skies are an example of where you might see color banding.)
More color depth is generally better, but you'll struggle to notice a difference between two cameras with less than 1 bit of difference. Color depth above 22 bits is considered excellent.
Want to learn more? Head over to our full glossary entry on color depth
Color depth test data courtesy of DxO Mark.
645D test data on DxO Mark 60D test data on DxO MarkMaximum effective ISO is an estimate of the highest sensitivity at which a camera can capture excellent quality photos.
Cameras with higher effective ISO will be better choices for indoor photography, night shooting, and indoor sports photography, especially if you intend to make large prints.
You can learn more at our glossary entry.
Maximum effective ISO test data courtesy of DxO Mark.
645D test data on DxO Mark 60D test data on DxO MarkCameras with longer battery life can take more photos before exhausting their batteries.
Special note: The measurement standard for battery life stipulates that if a camera has an internal flash, it must be used for 50% of photos taken. For this reason, comparisons of one camera with an internal flash to another without will not be comparable
Very high-resolution 40-megapixel sensor; Plentiful controls with great placement; Excellent optical viewfinder; Dual SDHC card slots; Infrared remote sensors front and back.
High price tag; Aliasing artifacts; Produces ~70MB RAW files.
Excellent 18-megapixel sensor with superb detail; Very good high ISO performance, especially for 18-megapixel subframe sensor; 3.0-inch, 1,040K-dot Vari-angle LCD is very useful for video and Live View; Sharp 18-135 kit lens with above average zoom range and I.S.; Full HD (1920x1080) movies at 30/25/24p, 60/50p at 1280x720.
Body not as rugged as mag-alloy 50D; AF assist only works when flash is up, though flash can be forced off; Auto-exposure not reliable in very low light; No continuous autofocus in Movie mode.
