Canon EOS 400D Digital Instruction Manual page 172

Image Conversion Factor
Since the image area is smaller
than the 35mm film format, the
equivalent lens focal length (crop
factor) will increase by 1.6x.
172
U.S.A. and Canada only:
The Lithium ion/polymer battery that powers the product is
recyclable. Please call 1-800-8-BATTERY for information on
how to recycle this battery.
Image size
22.2 x 14.8mm (0.87 x 0.58 in.)
35mm image size
36 x 24mm (1.42 x 0.94 in.)