Built-In Flash - Canon EOS 20D Service Manual

Technical Information
If any of the following occurs, the image-processing method will change during
the continuous shooting and the maximum burst displayed on the lower right of
the viewfinder will decrease sharply (less than 6 shots).
Note: Depending on the number of shots already taken, the camera may become "buSy" and no more
shots can be taken (in the worst case) when the image-processing method changes.
(1) During continuous shooting in the Portrait mode (built-in flash firing
automatically), you switched the built-in flash on/off.
(2) During continuous shooting, the external flash could not recycle in time
and the shooting continued.
(3) You pressed the shutter button fully repeatedly at short intervals.
(4) Right after shooting, you changed the shooting mode and started shooting
again immediately.
(5) During continuous shooting, the built-in flash was popped up or down (to
turn the flash on/off).
(6) During continuous shooting, the external flash was turned on/off and you
started shooting again.
Once the camera finishes processing the images in the buffer memory, the
camera goes back to the normal image-processing method.
3) Number of possible shots
With the DIGIC II featuring a power-saving circuit design and low power
consumption and a CMOS sensor consuming less power than before, the
number of possible shots is about 1,000 at 20ºC and 750 at 0ºC.
Note: With a fully-charged BP-511A and AE 100%. Based on CIPA testing standards.

1.8 Built-in flash

The built-in flash employs the
EOS IX-E's arm and the EOS
DIGITAL REBEL/EOS 300D
DIGITAL's pop-up system. The
distance between the optical axis
and built-in flash center is 18.6
mm longer than with the EOS
10D. This reduces the chances of
red eye occurring and makes it less likely for the lens barrel to obstruct the flash
coverage. With the EF-S 17-85mm f/4-5.6 IS USM, the built-in flash can be used
for subjects as close as 1 meter.
Also, the relative positions of the reflector and Xenon tube are optimized and the
flash panel's transparency has been improved. As a result, the built-in flash has
the same Guide No. 13 as the EOS 10D's built-in flash. Since the vertical flash
coverage angle is wider by 2
The built-in flash's retraction and pop-up have been improved with rubber fitted
for the stopper to cushion the pop-up. Also, a new latch mechanism is
incorporated to close the gap better.
Fig. 028 Comparison of built-in flash height
20