Slave Flash benefits
Most point & shoot style digital cameras lack hot shoes
and any means to fire a second flash unit. But a bracket-type flash
that has a built-in slave sensor can be used to fire in sync with
the camera's flash. Since digital cameras usually fire a series
to flash bursts (to set focus, white balance, etc.) prior to the
main burst of light, this slave flash should have a "smart"
sensor. This type of sensor will ignore the pre-flashes and fire
in sync with the primary burst of light.
A fully dedicated flash will interface with the camera's auto
focus and auto-exposure system, while producing considerably more
light for greater range and with more creative control than the
built-in flash.
A studio flash system with multiple flashes on light stands can
be used with digital cameras.
The primary issues are synchronizing the camera with the flashes
and controlling exposure. Ideally, the camera will have a PC flash
cord terminal or a hot shoe with a cord adapter to fire the flash
system.
Otherwise the built-in flash can be used to trigger the slave-equipped
studio flash.
The camera will need to have a flash mode that doesn't use pre-flashes,
or a "smart" slave that ignores pre-flashes will need
to be used. The camera will need to have manual exposure control
so the exposure and light output from the studio flash can be
balanced.
Ordinary flash units will not work because your digital camera
lacks a way to connect and/or mount an external flash. Even more
importantly, most digital cameras emit a “pre- flash”
and/or a ‘red-eye” pulse that fire before the shutter
opens, then an additional flash pulse is fired to actually light
your picture. This “pre-flash” (“double-flash”)
and/or “red-eye” pulse confuses other flash and slave
units , causing them to go off at the wrong time, and are useless
for your digital camera.
The Slave Flash has special digital pulse counting slave circuitry
that is not fooled by the “pre-flash” and eliminates
the need for an electrical connection to your camera. A three-position
switch sets the flash to ignore one or two “pre-flashes”,
or none at all.
The built in built in flash units of digital cameras are on average
effective to only about 12 feet, and that's when your lens is
at its widest-angle setting. When you want to zoom in on the action
(towards the telephoto end of your zoom range) you'll find that
your built in flash does exactly opposite of what you want, its
range is reduced to about 8 feet, and sometimes even less! So,
when you want to use your camera's telephoto capability that you
paid for, but also require the built in flash, your pictures come
out dark or, even worse, not at all.
Product Features & Specifications
In addition to its digital pulse counting slave circuitry, the
Slave Flash comes equipped with a built in hot shoe, quick release
mounting bracket and pc sync cord. The Slave Flash is compatible
with virtually any digital or film, point- n'- shoot or SLR camera
you might own .
Brand: BOWER
Function : Single Slave / Pre-Flash 2 Function mode
Guide Number : 28 (ISO 100@ S position
Angle of Coverage : 28mm - 70x53,85mm-32x32
Color Temperature : 5600k
Flash Control : Automatic at F2.8
Zoom Range : 28mm (w2) 35mm (w1) 50mm (s) 85mm (T)
Power Source : 4xAA size alkaline, NiCad or MiMH bat.
Horizontal Swivel : 0-300 degree
Bounce Adjustment : 0-90 degree
Flash Duration :1/1,000 - 1/20,000 sec
Weight : 221 gms - SF829TW 95 gms - Bracket
Dimension (mm) : 70D x 168H -SF829TW 60D x 115H - Bracket
The Flash Has A Hot Shoe And Can Be Attached Directly To Your
Digital Camera's Accessory Shoe, If One Is Provided. If Your Digital
Camera Does Not Have A Built-in Flash, The Flash Will Operate
As A Slave Unit Next To Your Digital Camera. In This Case, Either
Mount The Flash On The Accessory Shoe Of The Mounting Bracket
(Supplied) And Attach Next To Your Digital Still Camera By Tightening
The Knob, Or Simply Mount The Flash On The Mini Tripod (Supplied)
Place On Any Flat Surface.
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