Canon EOS 1D - Manual (Page 265)

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Use of genuine Canon accessories is recommended
This product is designed to achieve excellent performance when used with
genuine Canon accessories. Canon shall not be liable for any damage to this
product and/or accidents such as fire, etc., caused by the malfunction of non-
genuine Canon accessories (e.g., a leakage and/or explosion of a battery
pack). Please note that this warranty does not apply to repairs arising out of the
malfunction of non-genuine Canon accessories, although you may request
such repairs on a chargeable basis.
Image Conversion Factor
Since the image sensor size is
smaller than the 35mm film
format, it will look like the lens
focal length is increased by 1.3x.
Image sensor size
(27.9 x 18.6 mm / 1.10 x 0.73 in.)
35mm image size
(36 x 24 mm / 1.42 x 0.94 in.)
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