There is a separate range of allowable ISO values when using Auto ISO – by default for the EOS R5, the range is ISO100 to ISO12,800. If you find images at ISO12,800 are too noisy, reduce the ...
the precise 9-point auto focus system from the EOS 30D, improved grip, and a bigger 2.5-inch (64 mm) LCD with 230,000 pixels. The 400D uses the DIGIC II image processor, as is used in the 350D.