The ST-E3 Speedlite Transmitter works with the new speedlight from Canon, makes complex lighting setups simple. It can control over as many as five groups of flashes or 15 SpeedlitesNote: Because it does not have an optical transmission function, the Speedlite Transmitter ST-E3-RT is not compatible with earlier Speedlite models such as 580EX II.Product Highlights
·Facilitates Wireless Transmission
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·5 Groups or 15 Individual Speedlites
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·Range Up to 98.4'
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·Makes Complex Lighting Setups Simple
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·Compact Design & Reliable Construction
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·Clearly Laid Out Information Panel
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·Buttons With Back Lighting
·OverviewThe Canon ST-E3-RT Speedlite Transmitter can help you take full advantage of all the latest features on Canon's top-of-the-line 600EX-RT flash. The ST-E3-RT makes complex lighting setups simple by facilitating radio-controlled, two-way wireless transmission up to 98.4' away, among up to five groups or fifteen individual Speedlites. It has controls similar to the new Speedlite 600EX-RT, including multiple flash metering options, and a variety of flash modes. Compact design with highly reliable construction combined with a clearly laid-out information panel and buttons with back lighting make this an indispensible tool for advanced professional flash photography. The ST-E3-RT represents the next generation in wireless flash systems.
·Newly-designed wireless system uses 2-way radio wave communication for enhanced communication among master and slave units. Achieves a transmission distance of up to 98.4' (30 m), all at a 360 degree angle.
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·Up to 5 groups, or 15 individual flashes can be controlled via 1 transmitter.
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·Supports E-TTL II flash, manual flash, stroboscopic and auto external flash metering. Dot matrix LCD panel displays all pertinent information simultaneously and backlit control panel means easy operation.
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·8 types of custom functions, 3 types of personal functions.
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·Improved hot shoe contacts for more reliable information transmission and operation.
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·Slave operation confirmation:
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·Green Light--Lit: Radio Transmissions Okay
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·Red Light--Lit: Not Connected
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·Blinking: Transmission Error/ Too many units (Master units + slave units = more than 16 units)
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·Orange Light--Lit: Sub-master transmission
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·Blinking: Receiving remote release shooting, linked shooting signal
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·Not compatible with earlier Speedlite models such as 580EX II
·SpecificationsType Radio transmissions wireless Speedlite transmitter
Transmission Range Approx. 98.4 ft. (30m)
Flash Control Ratio control: 1:8 - 1:1 - 8:1, power 1/2-stop increments
Coverage Flash coverage: Transmission Angle: 360° all around
Power Source 2x AA/LRG Alkaline Batteries (Ni-MH and Lithium batteries can also be used)
Battery Life: Approx. 10 hours continuously when using AA/LR6 alkaline batteries (At a room temperature of 73°F/+23°C).
Dimensions 2.65 x 2.42 x 3.05" (67.4 x 61.5 x 77.4 mm)
Weight 3.9 oz (110 g) excluding battery