Pavel Kolpakov

UWTechnics External TTL Converter for Sony installation in M24 hole on Sea&Sea MDX-aU housings:

To use LED triggers in TTL/HSS modes, you should use new type 613 fiber optic cables. Other cable models may have a significantly lower transmission index. The type 613 cable is also mentioned in the trigger User Manual. You have to configure the trigger and camera according to the User Manual, step by step.

UWTechnics supplies a small 2x0.5mm flat-head screwdriver with every product. Here is the photo: This is a very popular flat tip size. It can be purchased at most hardware and auto parts stores. Please note that the rotary switch shaft is made of soft plastic (easily damaged with the wrong tool). It's best to use a standard small 2x0.5mm or similar size screwdriver.

Hi Brad, As i understand it, this is a second-hand TTL Converter for A7 camera, purchased together with a housing recently. You don't know the year of issue, so the circuit version is not clear enough. According to the photo, it looks like product of 2014 year. So, initial owner probably started to use it 12 years ago. But nobody knows if it works or broken now. I can help you with some information and User Manual. That circuit had a little bit different schematics than modern versions, and It did not have a separate profile for Z330 yet. Switch position "6" was reserved (empty) there. But you can use any existing similar profile, for example Z240 (switch position - 1). It is not the same, but will work. You also can try another profiles, according to the User Manual that i sent you by email.

A few more photos:

The installation and functionality of UWTechnics External M24 TTL Converters on the new Seafrogs aluminum housings has been successfully tested. UWTechnics TTL converters with M24 thread (Sony, Nikon, Canon, Olympus) fit perfectly into the M24 hole on the top of those Seafrogs aluminum housings, without interfering with external controls. The metal bracket also eliminates interference. The connection to the camera (inside the housing) is also comfortable. The installation on aluminum Seafrogs housings is very simple and secure, the same well as TTL Converter M24 installation on Nauticam and Marelux housings. So, now the TTL and HSS flash control is available for this housings line, supporting the most popular strobes on the market: Sea&Sea, Inon, Retra, Marelux, etc. This information may be useful for Seafrogs users.

This is a new product, still in development. Technical delays are possible. However, it will be available soon.

Backscatter strobes have proprietary TTL protocol, not a classic TTL. Proprietary TTL protocol requires Backscatter triggers usage, as i remember those triggers exist for Olympus and Sony. The HSS system in Backscatter strobes is compatible with most of HSS triggers on the market, including UWT triggers of course.

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Silver/Black color design version:

I consider the MF-3 a nice product with a well-thought-out design. The strobe will be popular on the market.

It looks like low battery, or weak contact in the battery holder. Remove the product from the housing. The next actions do on the table, without housing and other gear, but only with the camera: Remove the batteries from TTL Converter. Bend down the central tongue of the battery holder pushing it maximum down by any tool (flat screwdriver), to improve the contact. Then, install 2 batteries. Batteries must be NEW. Check the "flash" symbol on the service screen and the LEDs work. Set all camera settings described in the User Manual of TTL Converter for TTL mode, carefully step by step (this is absolutely necessary). After the TTL flash tests on the table directly with the strobe (without fiber cable!) you can install the product into the housing and connect your cable.

Underwater Technics TTL converters for OM System / Olympus draw a micro-current from the +5V power supply pin on the camera's hot shoe and require no battery. Micro-current consumption has virtually no impact on the camera's battery capacity. The user does not need to worry about the battery for TTL Converter, that is very convenient. TTL Converters have intellectual two-way communication with the camera and fully controllable by the camera menu. The main features are as follows: ▪ Supported strobes: Inon, Sea&Sea, Retra, Apollo, Ikelite, Subtronic and others. ▪ TTL / M / HSS mode switching underwater via camera menu ▪ "Balanced TTL flash metering" is available ▪ "Exposure Shift" is available for each metering method ▪ “Flash Exposure compensation +/-” adjustment via camera menu ▪ HSS sync speeds up to 1/8000s ▪ Manual Adjustment of strobe intensity (via camera menu in “M” flash mode): 1/64.....Full ▪ 1-st / 2-nd curtain synchronization ▪ “Flash Off” mode via camera control ▪ Continuous (serial) shooting ▪ Automatic switching “ON/OFF” by camera protocol ▪ No battery required Factory produces the following versions of the External TTL Converter for OM System / Olympus: M16 for Nauticam, Marelux and Seafrogs housings, M24 for Marelux, Seafrogs aluminum housings, M16 for Ikelite housings, 1/2"UNF for Ikelite housings, M16 for Isotta housings, M12 for Seafrogs polycarbonate housings. The following versions of the Internal TTL Converter for OM System/ Olympus are in production now: for Nauticam housings, for Isotta housings, for Marelux housings (will be announced soon). For more information, please visit uwtechnics.com.

If you set both camera and strobe to M mode, but any problem still exists, it means we don't have a complete information about the settings / setup. Sometimes key information escapes the user's attention. I can help identify incorrect settings in real time using photo/video chat via FB messenger. The solution will take a couple of minutes. If you need this help, please contact me on FB.

Chris, I absolutely agree with you. I also already answered about this reason above. Topic starter used TTL mode on the camera, but M mode on the strobe. The energy discharges at the pre-flash. This is a clear reason.