C'est possible, soit avec le soft de Canon, soit avec d'autres comme PhaseOne CaptureOne ou Breeze Systems DSLR Remote Pro. Malheureusement, je crois que le 10D comme le 300D sont équipés en USB1. Le transfert d'un RAW met entre 20 et 30 secondes, pas très pratique donc.
Voici les temps des différents modèle Canon d'après la doc de DSLR Remote Pro :
Sample Timings
Top Previous Next
The tables below show approximate timings for the minimum interval between photographs when triggering the shutter from the PC. The timings approximate and are for guidance only.

Canon EOS 5D

Size/Quality
Save to PC only
Save to camera only
Save to PC and camera

Raw only
3.5
2.2
4.2

Large/fine
2.5
2
3

Small/normal
2
2
2.2


When taking photos using the camera's shutter release the camera can take photos at its normal frame rate (3 frames/sec) until its buffers become full. After an initial camera processing delay the images will be transferred to the PC at approximately 3 Mb/sec. The camera is able to continue taking photos at a reduced frame rate until its secondary buffers become full and then has to wait for images to be downloaded before taking more photos.

Canon EOS 20D and 350D/Rebel XT

Size/Quality
Save to PC only
Save to camera only
Save to PC and camera

Raw only
2.6
2.5
2.6

Large/fine
2.1
2
2.1

Small/normal
2
2
2


When taking photos using the camera's shutter release the camera can take photos at its normal frame rate (5 frames/sec for the 20D and 3 frames/sec for the 350D/Rebel XT) until its buffers become full. After an initial camera processing delay the images will be transferred to the PC at approximately 3 Mb/sec. The camera is able to continue taking photos at a reduced frame rate until its secondary buffers become full and then has to wait for images to be downloaded before taking more photos.

Canon EOS-1D Mark II

Size/Quality
Save to PC only
Save to camera only
Save to PC and camera

Raw
3.8
3
4.5

Large/fine
2.3
2.7
3.1

Small/normal
2
2.4
3


When taking photos using the camera's shutter release the camera can take photos at its normal frame rate (8 frames/sec) until its buffers become full. After an initial camera processing delay the images will be transferred to the PC at approximately 2.5 Mb/sec. The camera is able to continue taking photos at a reduced frame rate until its secondary buffers become full and then has to wait for images to be downloaded before taking more photos.

If the EOS-1D Mark II is set to continuous, high speed drive mode and the pictures are taken using the camera's shutter release (as opposed to triggering the shutter from the PC) it can sustain a shooting rate of approximately 3 frames/sec indefinitely when shooting in small/fine JPEG or large/normal JPEG.

Canon EOS-1D

Size/Quality
Save to PC only
Save to camera only
Save to PC and camera

Raw
3
1.5
2

Large/fine
3
1.5
3

Small/normal
2
1.5
3


When taking photos using the camera's shutter release the camera can take photos at its normal frame rate until its buffers become full. After an initial camera processing delay the images will be transferred to the PC at approximately 1.5 Mb/sec. The camera is able to continue taking photos at a reduced frame rate until its secondary buffers become full and then has to wait for images to be downloaded before taking more photos.

If the EOS-1D is set to continuous, high speed drive mode and the pictures are taken using the camera's shutter release (as opposed to triggering the shutter from the PC) it can sustain a shooting rate of approximately 3 frames/sec indefinitely when shooting in small/fine JPEG or large/normal JPEG.

Canon EOS 10D

Size/Quality
Save to PC only
Save to camera only
Save to PC and camera

Raw
35
8
41

Large/fine
14
5
17

Medium/fine
9
4
11

Small/fine
6
4
8

Small/normal
4
4
6


When taking photos using the camera's shutter release the camera can take photos at its normal frame rate until its buffers become full. After an initial camera processing delay the images will be transferred to the PC at approximately 0.25 Mb/sec. The camera is able to continue taking photos at a reduced frame rate until its secondary buffers become full and then has to wait for images to be downloaded before taking more photos.

Please note: The above timings were performed using a Canon EOS 10D with firmware version 1.0.0. The timings with firmware version 2.0.1 are approximately 50% longer.

Canon EOS 300D Digital/Kiss Digital/Digital Rebel

Size/Quality
Save to PC only
Save to camera only
Save to PC and camera

Raw
57
8
55

Large/fine
19
4
20

Medium/fine
10
4
11

Small/fine
7
4
7

Small/normal
5
3
6


When taking photos using the camera's shutter release the camera can take photos at its normal frame rate until its buffers become full. After an initial camera processing delay the images will be transferred to the PC at approximately 0.18 Mb/sec. The camera is able to continue taking photos at a reduced frame rate until its secondary buffers become full and then has to wait for images to be downloaded before taking more photos.