III. FEATURE DISCUSSION 20
Interface
Drive and Power Source
T
he XTi’s weight is still very modest although it has increased by 25 grams to 510g/18
o
z., excluding battery pack, CF card and body cap, but including the backup battery and
t
he eyecup.
W
hile based on the Digital Rebel XT’s electrical components, the XTi’s electrical com-
p
onents are compatible with several significant new features, such as the 10.10-
m
egapixel CMOS sensor, Self Cleaning Sensor Unit, Display-off sensor, and the 2.5-
in. LCD screen. As with the XT, the XTi's main circuit board is a highly-integrated 8-
layer board fitted with the digital control circuit, camera control circuit, image-signal
processing circuit, and DC/DC converter circuit. In addition, there are five hard
boards, and sixteen flexible boards.
The USB 2.0 Hi-Speed, mini B port enables high-speed image transfers from the camera
to a personal computer (see Direct Image Transfer) using Interface Cable IFC-400PCU
(included). Also, the PTP protocol is now used for both Camera Direct printing and
transmissions to a personal computer, making it unnecessary to switch the communica-
tions setting.
An NTSC/PAL video output terminal is provided; it uses Video Cable VC-100 (included).
The remote control terminal is compatible with Remote Switch RS-60E3 (2.5 mm dia.
mini jack, optional***). Wireless remote control is compatible with Remote Controllers
RC-1 and RC-5 (optional). The wireless remote control receiver is built inside the camera
grip. The system is compatible with all shooting modes and works within approx. 5
m/16.4 f
t. (at front and center). When the Drive mode button is pressed, the self-
timer/wireless remote control timer icon is displayed on the LCD screen.
The maximum continuous shooting speed of the Digital Rebel XTi is approx. 3 fps (in
both the One-Shot AF and AI SERVO AF modes), the same as the Digital Rebel XT in spite
of the larger files the XTi generates. This is achieved by a number of features: the reflex
mirror drive and shutter drive are controlled independently; the advanced, Canon-
designed and -manufactured CMOS sensor enables high-speed signal reading, and the
DIGIC II image processor performs high-speed image processing.
To limit the increase in power consumption required by high-speed reading, the output
amp's power consumption has been minimized. Further, during long exposures, power
F
lash Circuit Board
Self Sensor Cleaning Unit
Circuit Board
Motor Drive Board
E
xternal Interface
Connection
Circuit Board
SDR SDRAM
DIGIC II Image Processor
Main board (top)
M
ain board (bottom)
