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Canon Speedlite 90EX Flash Compared to the Canon Speedlite Transmitter ST-E2
| Specifications | Canon Speedlite 90EX Flash | Canon Speedlite Transmitter ST-E2 |
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| Power: Guide No (ISO 100) | 30' / 9m (at 24mm) | |
| Angle of Flash Coverage | ||
| Auto | ||
| Manual | 24mm | |
| With Diffuser | ||
| AF Assist Beam | ||
| AF Assist Beam Type | Intermittent flash firing | Near-infrared light pattern projection |
| AF Assist Beam Points | 1 to 45 | |
| AF Assist Beam Min Focal Length | 24mm (APS-C 15mm) | 28mm (APS-C 18mm) |
| AF Assist Beam Range – Center | 9.2' (2.8m) | 2.0-33' (0.6-10m) |
| AF Assist Beam Range – Periphery | 8.2 (2.5m) | 2.0-16' (0.6-5m) |
| Flash Exposure Modes | ||
| Auto Exposure Standards Supported | E-TTL II/E-TTL | E-TTL II/E-TTL |
| External Auto Flash Exposure Sensor | N | N |
| Manual Flash Exposure | N | N |
| Features Controllable from Flash | ||
| High Speed Sync | N | Y |
| Flash Exposure Lock (FEL) | Y | |
| Flash Exposure Compensation (FEC) | N | |
| Flash Exposure Bracketing (FEB) | N | |
| Second Curtain Flash Sync | N | |
| Modelling Flash | N | |
| Color Temperature Info Communication | Y | N |
| Supports Flash Settings by Camera Menu (Enables many options not available directly on the flash) |
Y | N |
| Custom Functions | 1 | 0 |
| Personal Functions | ||
| Wireless Flash Capabilities | ||
| Wireless Flash Transmitter Capability | Y | Y |
| Wireless Transmission Type | Optical | Optical |
| Transmitter Max Range – Indoors | 23.0' (7m) | 39.4-49.2' (12-15m) |
| Transmitter Max Range – Outdoors | 16.4' (5m) | 26.2-39.4' (8-10m) |
| Wireless Flash Slave Capability | ||
| Wireless Flash Groups | 3 | 2 |
| Wireless Flash Channels | 4 | 4 |
| Remote Shutter Release Capability | N | N |
| Flash Head Movement Range | ||
| Flash Head Movement Up | Fixed | Fixed |
| Flash Head Movement Down | ||
| Flash Head Movement Left | ||
| Flash Head Movement Right | ||
| Flash Features | ||
| Dust and Water Resistance | N | N |
| PC Terminal | N | N |
| Power Source | ||
| Power Source | 2x AAA | 1x 2CR5 |
| Number of Flashes (approx) | ||
| Recycling Time – NiMH (approx) | ||
| Recycling Time – Alkaline (approx) | 0.1 - 5.5 sec. | |
| External Power Source | ||
| Size | ||
| Size (WxHxD) | 1.7 x 2.0 x 2.6" (44.2 x 52.0 x 65.0mm) |
2.4 x 2.0 x 3.1" (62 x 51 x 80mm) |
| Weight | 1.8 oz (50g) | 3.5 oz (100g) |
| Accessories | ||
| Compatible Accessories | Off-camera shoe cord OC-E3 EX Series Speedlite with Optical Slave function |
Off-camera shoe cord OC-E3 EX Series Speedlite with Optical Slave function |
| Dedicated Flash Bracket | ||
| Compatible Cameras | All Canon EOS cameras PowerShot G series cameras |
All Canon EOS cameras PowerShot G series cameras |
| Review | Canon Speedlite 90EX Flash | Canon Speedlite Transmitter ST-E2 |
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