Geekoto Technology

The Geekoto GTR is a 76Ws TTL round-head camera flash with high-speed sync, rechargeable lithium battery power, magnetic accessory
support, and Canon/Nikon or Sony variants.

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Key features:
- 76Ws TTL round-head speedlight
- Guide Number 53
- High-speed sync up to 1/8000s
- Head rotates 360 degrees
- Head tilts from -7 to 90 degrees
- Magnetic surface for accessory modifiers
- Rechargeable removable 11.1V/2000mAh lithium battery
- Approximately 500 full-power flashes per charge
- Full-power recycle time: approximately 2.1 seconds
- Front and rear-curtain sync
- Built-in 2.4GHz wireless master and slave modes
- 16 wireless channels and groups A, B, and C
- AF assist lamp
- 2W LED modeling lamp, 3300K ±200K
- 2.5mm cabled triggering port

Technical Specifications:
- Model: GTR
- Product Type: TTL Round-Head Camera Flash / Speedlight
- Flash Power: 76Ws
- Guide Number: 53
- Power Range: 1/128 to 1/1 in 1/3-stop increments
- Flash Duration: 1/360s to 1/230,000s
- Color Temperature: 5600K ±200K
- High-Speed Sync: Up to 1/8000s
- Battery: Removable LE-26B, 11.1V/2000mAh lithium
- Full-Power Flashes: Approximately 500 per charge
- Full-Power Recycle Time: Approximately 2.1 seconds
- Flash Coverage: 18-180mm, auto or manual zoom
- Head Rotation: 360 degrees
- Head Tilt: -7 to 90 degrees
- Wireless: Built-in 2.4GHz master and slave
- Wireless Range: Approximately 50m
- Wireless Channels: 1-16
- Wireless Groups: A, B, and C
- Optical Slave: S1 and S2, approximately 15m outdoors
- Modeling Lamp: 2W LED, 3300K ±200K
- Cabled Triggering: 2.5mm sync port
- Dimensions: 76 × 76 × 205mm
- Weight: 450g without battery; 575g with battery
- Camera Variants: Canon/Nikon and Sony

What's Included
- 1 x Geekoto GTR flash
- 1 x Rechargeable lithium battery,
- Charger, pouch/case, stand, diffuser, manual

FAQ
Q: Is the GTR an on-camera or off-camera flash?
A: The GTR can be used on-camera and in compatible wireless off-camera setups.

Q: Which GTR version should I buy?
A: Choose the Canon/Nikon version for a compatible Canon or Nikon camera, or the Sony version for a compatible Sony camera.

Q: Does the GTR support TTL?
A: Yes. The Canon/Nikon version supports Canon E-TTL II and Nikon i-TTL. Use the matching GTR version for your camera system.

Q: Does the GTR support high-speed sync?
A: Yes. It supports high-speed sync up to 1/8000 second when used with a compatible camera or wireless transmitter.

Q: Can I control the GTR off-camera?
A: Yes. The GTR has built-in 2.4GHz wireless master and slave modes and works with compatible Geekoto transmitters, including the C1-PRO. Match the wireless channel and group on the flash and transmitter.

Q: What wireless channels and groups does the GTR use?
A: The GTR provides 16 channels and groups A, B, and C. Its approximate 2.4GHz transmission range is 50 meters under suitable conditions.

Q: Does the GTR have optical slave modes?
A: Yes. S1 is for manual-flash triggering, while S2 ignores a TTL preflash. The manual lists an approximate outdoor optical range of 15 meters with clear line of sight.

Q: How much power does the GTR provide?
A: The GTR provides 76Ws, adjustable from 1/128 to full power in 1/3-stop increments.

Q: How many full-power flashes does the GTR battery provide?
A: The removable LE-26B 11.1V/2000mAh lithium battery provides approximately 500 full-power flashes per charge.

Q: How fast does the GTR recycle?
A: Full-power recycle time is approximately 2.1 seconds with a charged battery.

Q: How far can the GTR flash head move?
A: The head rotates 360 degrees and tilts from -7 to 90 degrees for direct or bounce flash.

Q: Does the GTR have a modeling light?
A: Yes. It has a 2W LED modeling light rated at 3300K ±200K. Hold the LED button for about three seconds to turn it on or off.

Q: Does the GTR support multi-flash mode?
A: Yes. Multi mode supports 1 to 40 flashes with an adjustable frequency from 1 to 199Hz, subject to the selected flash power and overheating limits.

Q: Does the GTR have a sync port?
A: Yes. It has a 2.5mm sync port for cabled triggering.

Q: Does the GTR support magnetic modifiers?
A: Yes. Its round head has a magnetic surface for compatible Geekoto light modifiers.