Canon EOS-1D C Manual (en)

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Batch Transfer
36
Selecting [RAW+JPEG transfer] in step 
2 on page 34 will give you the option of 
transferring RAW images, JPEG images, 
or both types of images.
The options will be the same whether 
you specify [Sel. Image], [Sel. n], or 
[All image] as the image selection 
method.
You can use the menu even during image transfer. However, to prevent 
transfer problems, some menu items are unavailable during transfer, 
such as [Communication settings], [Protect images], [Erase 
images
], [Format card], and [Record func+card/folder sel.].
1
On the [32] tab, select [Image 
transfer].
2
Select [Image sel./transfer].
[RAW+JPEG transfer] Options
Menu Operation During Image Transfer
Batch Transfer of Images in a Folder
If you shoot a movie during the image transfer of captured images, the 
image transfer will be temporary cancelled during movie shooting.