Canon EOS-1D C - Manual (Page 65)

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Differences with the EOS-1D X Instruction Manual
The file size, possible shots, and maximum burst during continuous shooting
are based on Canon’s 8 GB testing card and Canon’s testing standards (JPEG
quality 8, ISO 100, and Standard Picture Style). These figures will vary
depending on the subject, card brand, ISO speed, Picture Style, Custom
Functions, and other settings.
The maximum burst applies to high-speed continuous shooting.
Figures in parentheses apply to an Ultra DMA (UDMA) mode 7, 128 GB card
based on Canon’s testing standards.