The Canon Speedlite 577G is an
extremely powerful handle-mount flash unit
with external power supply designed expressly
for professional use. Engineered to function
with Canon SLR cameras and other cameras
having direct contact accessory shoes or
standard PC terminals, the 577G is an
advanced thyristorized system flash featuring
three automatic flash ranges plus automatic
bounce flash and a high Guide Number of 157
with ISO/ASA100 film. A remote flash sensor
mounts on the camera's accessory shoe to
provide accurate automatic exposure control
regardless of the position or bounce angle of
the flash , even when it is used off-camera or
aimed away from the subject, eg: into a flash
umbrella, etc.
The Transistor Pack G portable power
supply can be loaded either with a battery
magazine containing six (6) "c" size Alkaline
batteries or with the Canon Ni-Cd Pack TP
self-contained Ni-Cd battery system .
SPECIFICATIONS
Type: Thyristorized computer flash w/series
control system
Attachment: Canon One-Touch Bracket
Synchronization: Through separate sensor
unit mounted on camera's direct contact
shoe or with sychro cord
Guide Numbers: (ISO/ASA 100, feet): Normal
-15.7
92 with Wide Adaptor 577G-24
79 with Wide Adaptor 577G-20
207 with Tele Adaptor 577G
Flash Coverage: For 35mm format covers
angle of view of 35mm lens without
adaptors
24mm lens with Wide Adaptor 577G-24
20mm lens with Wide Adaptor 577G-20
1 OOmm lens with Tele Adaptor 577G
Recycling Time: With Alkaline-Manganese
batteries: approximately 18 seconds
With NiCd batteries: approximately 7
seconds
Number of Flashes: Alkaline-Manganese
batteries: 100-1000 allowing 30 seconds
between flashes NiCd batteries: 75-750
allowing 30 seconds between flashes
Color Temperature: Same as Daylight
Flash Duration: 1/400th-1/50,000th second
Flash Control System: Automatic flash
sensor measures light reflected back from
subject and cuts output when sufficient
illumination is sensed
Metering Sensitivity pattern: Average
measurement
Auto Flash Ranges: Three different flash
ranges are provided for flexibility and
control of depth-of-field
Auto Apertures: (ISO/ASA 100): Red-f2.8
Green-f5.6
Yellow-f11
Dimensions: 27
/. x 4'/4 x 95
/. inches
Weight: 2H16 ounces
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