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Canon Flash Triggers & Cables

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Canon STE2 Digital Speedlite Transmitter for EOS Camera Flash

$331.10

The Canon Speedlite Transmitter ST-E2's flash master effective range is 39-49' indoors and 26-32' outdoors. Used indoors, direct line of sight is often not required as the light bounces from walls and other objects to reach the flash units.

Canon flash Transmitter , there are some other advantages to using a flash as the master. While both the Canon Speedlite Transmitter ST-E2 and the flashes will simultaneously master any number of slave (remote) flashes (including the 580EX, 550EX, 430EX and 420EX), the Canon Speedlite Transmitter ST-E2 controls only 2 channels (A and B) while the 550EX and 580EX flashes will control 3 channels (A, B and C).

Both the Canon Speedlite Transmitter ST-E2 and the flashes will allow flash output ratios to be adjusted between the channels they control. The ST-E2 allows ratios from 8:1 to 1:1 to 1:8 to be selected in 1/2 stop increments. I expect that 2 channels are enough for most people. Flash output at the subject can also be controlled by moving them farther away and/or adding diffusers.

Both Canon STE2 Digital Speedlite Transmitter and the flashes will provide focus assist. You might want to find out how many focus points each supports. While the ST-E2 and 550EX Flash support 45 focus point bodies, the 580EX supports all EOS body focus points. The ST-E2 focus assist effective distance ranges from 30' in the center to 16.5' in the periphery. EF lenses 28mm and up are supported, AI Servo mode is not supported.

The 550EX and 580EX master flashes can enable FEB (Flash Exposure Bracketing) and allow manual flash output to be controlled by the master - Two capabilities not found in the Canon Speedlite Transmitter ST-E2. The Canon Speedlite Transmitter ST-E2 and the master flashes all support highspeed flash.

There are advantages to using the Canon Speedlite Transmitter ST-E2. The first is the size and weight. The Canon Speedlite Transmitter ST-E2 weighs only 3.5 oz without the non-included-in-the-box 2CR5 6v battery. The ST-E2 is very small compared to master flashes and mounts on an EOS body's hot shoe (or on a Canon Off Cammera Shoe Cord OC-E3 for extra creativity). It is really nice to have significantly less weight in your hand for a long shoot.

I mentioned that the Canon Speedlite Transmitter ST-E2 does not include the 2CR5 6v battery in the box - Take note of this fact when you place your order. The battery lasts about 1,500 transmissions at room temperature. Unless you count your shots, you should probably keep a spare on hand because the battery will surely fail when you need it most.

Canon STE2 Digital Transmitter Specifications:

Flash Type: 550EX-dedicated, clip-on Speedlite transmitter with direct contacts
Compatible Cameras:Type A EOS cameras (E- TTL, autoflash) Type B EOS cameras (Manual flash) Sync SpeedHigh - Speed Sync (FP flash): Enabled with high-speed sync mode

Flash Exposure
Confirmation :Before flash fires during FE lock
                  Adequate flash exposure indicated by the
                  flash exposure level icon lit in the
                  viewfinder. Insufficient flash exposure
                  indicated by the flash exposure level icon
                  blinking in the viewfinder.
                  After flash fires ST-E2's flash confirmation
                  lamp lights in green for 3 sec.

Canon STE2 Digital Speedlite Transmitter for EOS Camera Flash More Details