The s-TURTLE SMART 3 TTL Trigger for Sony mirrorless cameras is a next-generation underwater flash control system designed for professional underwater photographers who demand precision, reliability, and maximum flexibility.
It delivers accurate TTL and Manual flash control via fiber optic or sync cord connection, ensuring consistent exposure and full creative lighting control underwater. Built on the advanced SMART 3 platform, this upgraded system introduces new hardware architecture, expanded strobe compatibility, and enhanced power efficiency for extended dive sessions.
More than a simple update, SMART 3 represents a significant evolution in underwater flash triggering—featuring improved battery performance, USB-C connectivity, reinforced hardware components, and intelligent software-based configuration.
Designed specifically for Sony mirrorless camera systems, it integrates seamlessly into professional underwater housing setups and supports a wide range of today's most popular underwater strobes.
Key Features
- Advanced TTL and Manual flash control
- Designed specifically for Sony mirrorless camera systems
- Supports fiber optic LED and sync cord triggering
- Next-generation SMART 3 hardware and software platform
- User-replaceable high-capacity battery with up to 3× the capacity of previous SMART generations
- USB-C charging and configuration interface
- Reinforced switches and durable underwater-grade connectors
- Intelligent battery status indicator ("SMART" button system)
- Battery level indication:
- 4 flashes = 100%
- 3 flashes = 75%
- 2 flashes = 50%
- 1 flash = 25%
- Camera-menu-based switching between TTL and Manual (WL) modes, even underwater
- No-preflash Wireless (WL) mode for reliable manual flash operation
- Supports first-curtain sync
- Supports second-curtain sync
- Supports strobe/multiflash mode
- High-Speed Sync (HSS) support in Manual (WL) mode with compatible strobes
- Software-configurable system for strobe compatibility and advanced setup
- Optimized for professional underwater photography workflows
Specifications
- Product Type: Underwater TTL / Manual flash trigger
- System Compatibility: Sony mirrorless cameras
- Flash Modes: TTL, Manual (WL)
- HSS Support: Available in Manual (WL) mode with compatible strobes
- Trigger Methods: Fiber optic LED or sync cord output
- Power System: Rechargeable user-replaceable SMART 3 battery system
- Battery Capacity: Approximately 3× higher than SMART 1 and SMART 2 generations
- Charging Interface: USB-C
- Configuration: PC and Mac software setup tool
- Sync Modes: First Curtain, Second Curtain
- Flash Functions: TTL, Manual, Multiflash/Strobe Mode
- Housing Integration: Internal installation in compatible underwater housings
- Firmware Updates: Supported via USB-C connection
- Settings Control: Camera-menu-based flash mode switching
- Camera Compatibility
- Sony mirrorless camera systems
- Tested Sony models include:
- Sony A7 II
- Sony A7R II
- Sony A7S II
- Sony A7 III
- Sony A7R III
- Sony A7S III
- Sony A7R IV
- Sony A7 IV
- Sony A1
- Sony A9
- Sony A9 II
- Sony A7C
- Sony A7C II
- Sony A7CR
- Sony α6000 Series
- HI+ Burst Mode Tested and Supported
- Sony A7 IV
- Sony A1
- Sony A7R V
- Sony A9 II
- Compatibility may vary depending on firmware and system configuration via SMART 3 software.
- Strobe Compatibility (TTL / Manual / HSS Depending on Setup)
- Ikelite
- Seacam
- Seaflash 60D
- Seaflash 160D
- Inon
- Sea & Sea
- YS-D1
- YS-D2J
- YS-D3
- YS-D3 DUO
- Retra
- AOI
- Backscatter
- Mini Flash 2 (Manual / HSS)
- HF-1
- Marelux
- Subtronic
- Additional strobe profiles are regularly added via software updates.
- Trigger Connection Compatibility
- Fiber optic LED triggering systems
- Electrical sync cord underwater strobes
- Multi-brand TTL and manual strobe systems (via configuration profiles)
In the Box
- 1× s-TURTLE SMART 3 TTL Trigger for Sony mirrorless cameras
- 1× SMART 3 rechargeable battery (installed)
- 1× Spare SMART 3 rechargeable battery
- 1× LED fiber optic output module or sync cord interface
- 1× USB-C charging and configuration cable
- 1× User manual / setup guide
