1. Introduction
The Meike MK-GT620 is a versatile 2.4 GHz wireless flash trigger and receiver system designed to provide advanced flash control for Nikon DSLR cameras. This device supports I-TTL II autoflash, high-speed synchronization up to 1/8000s, flash exposure correction, and flash exposure lock. With a robust wireless transmission range of up to 100 meters, the MK-GT620 allows photographers to control multiple flash units across three distinct groups (A, B, C) via its intuitive LCD display. This manual will guide you through the setup, operation, and maintenance of your MK-GT620 to ensure optimal performance.
2. Package Contents
Please check that all items are present in your package:
- 1 x Meike MK-GT620N Transmitter
- (Note: Other flash units and cameras are not included and must be purchased separately.)
3. Product Overview
Familiarize yourself with the components and controls of your MK-GT620 transmitter.
3.1. Front and Top View
3.2. Controls and Indicators
- Power Button (): Turns the unit on or off.
- Light/Mode Button: Controls backlight and switches between operating modes.
- Test Flash Button: Triggers a test flash.
- Group (Gr) Button: Selects flash groups (A, B, C).
- SET Button: Confirms selections or enters settings menus.
- Info (i) Button: Displays additional information or accesses specific settings.
- Master/Slave (M) Button: Toggles between Master and Slave modes.
- LCD Display: Shows current settings, group status, exposure compensation, and channel information.
- Hot Shoe Mount: For attaching the transmitter to your camera's hot shoe.
- LINK Indicator: Indicates wireless connection status.
4. Setup
4.1. Battery Installation
The MK-GT620 transmitter is powered by AA batteries. To install:
- Locate the battery compartment cover on the unit.
- Open the cover and insert the AA batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
4.2. Mounting on Camera
To mount the MK-GT620 transmitter onto your Nikon DSLR camera:
- Slide the transmitter's hot shoe mount into your camera's hot shoe.
- Secure the transmitter by tightening the locking mechanism (if present) on the hot shoe mount.
4.3. Powering On/Off
Press and hold the Power button to turn the MK-GT620 on or off. The LCD display will illuminate upon powering on.
4.4. Initial Pairing and Channel Setting
For wireless operation, ensure your remote flash units (e.g., speedlites, studio lights) are compatible with the Meike 2.4 GHz wireless system and set to the same channel and group as the MK-GT620 transmitter.
5. Operating Instructions
5.1. Basic Flash Triggering
Once the transmitter is mounted and powered on, and your remote flashes are ready, simply press your camera's shutter button to trigger the flashes wirelessly.
5.2. TTL Functions (I-TTL II)
The MK-GT620 fully supports Nikon's I-TTL II autoflash system. This allows your camera to automatically determine the correct flash output for optimal exposure. Ensure your camera and flash units are set to TTL mode.
5.3. High-Speed Synchronization (HSS)
The unit supports 1/8000s High-Speed Synchronization (HSS), enabling you to use flash at shutter speeds faster than your camera's native sync speed. This is particularly useful for overpowering ambient light or using wide apertures in bright conditions. Activate HSS on your camera and compatible flash units.
5.4. Flash Exposure Correction (FEC) and Lock (FEL)
You can adjust flash exposure compensation directly from your camera or, if supported, via the MK-GT620's controls. Flash Exposure Lock (FEL) allows you to lock the flash exposure value for a specific area of your scene before recomposing and shooting.
5.5. Wireless Remote Control and Group System
The MK-GT620 allows control over three groups (A, B, C) of remote flashes. Use the 'Gr' button to cycle through and select groups. You can adjust settings for each group independently (e.g., TTL, Manual power, exposure compensation) using the 'SET' and directional buttons. The 'M' button allows you to switch the transmitter between Master and Slave modes, though it primarily functions as a Master when mounted on the camera.
5.6. LCD Display Navigation
The LCD display provides real-time feedback on your settings. Use the 'SET' button to enter menus and the directional controls (often integrated with 'Gr' and 'M' buttons or a dial) to navigate and change values. Press 'SET' again to confirm changes.
6. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the unit. For the LCD screen, use a microfiber cloth. Avoid using harsh chemicals or abrasive materials.
- Storage: When not in use for extended periods, remove the batteries to prevent leakage. Store the unit in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: Always use fresh, high-quality AA batteries. Replace all batteries at the same time.
- Hot Shoe Contacts: Keep the hot shoe contacts clean and free from dust or debris to ensure reliable communication with your camera.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Flashes not firing | Low batteries in transmitter or flash units; incorrect channel/group settings; flash units not in wireless mode; transmitter not securely mounted. | Replace batteries; ensure transmitter and flashes are on the same channel and group; set flashes to wireless receiver mode; re-mount transmitter securely. |
| Inconsistent firing or short range | Interference from other 2.4 GHz devices; physical obstructions; low battery power. | Change wireless channel; ensure clear line of sight between transmitter and flashes; replace batteries. |
| Flash exposure issues (too bright/dark) | Incorrect TTL/Manual settings; flash exposure compensation applied; ambient light conditions. | Check camera and flash settings; adjust FEC; switch to manual mode for precise control. |
| HSS not working | Camera or flash unit does not support HSS; HSS not enabled on camera/flash. | Verify HSS compatibility of all equipment; enable HSS in camera and flash menus. |
8. Specifications
| Feature | Specification |
|---|---|
| Brand | MEIKE |
| Model | MK-GT620 |
| Wireless Frequency | 2.4 GHz |
| Transmission Distance | Up to 100 meters |
| High-Speed Sync (HSS) | Yes, up to 1/8000s |
| Power Source | AA Battery |
| Compatible Brand | Nikon |
| Color Temperature | 5500K±200 |
| Display | LCD Screen |
| TTL Support | Yes (I-TTL II Autoflash) |
| Certification | CE |
9. User Tips
- Test Before Shooting: Always perform a test flash before a critical shoot to ensure all units are firing correctly and synchronized.
- Line of Sight: While 2.4 GHz is robust, maintaining a clear line of sight between the transmitter and receiver units can improve reliability, especially at longer distances.
- Battery Life: Carry spare AA batteries, especially for longer shoots, as wireless triggers can consume power quickly.
- Firmware Updates: Check the manufacturer's website periodically for any available firmware updates that might improve performance or add new features.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the documentation provided with your purchase or contact your retailer. Keep your proof of purchase for warranty claims.
