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Pavel Kolpakov

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Everything posted by Pavel Kolpakov

  1. Ok, Some more advices: 1) YS-D2 has 2 different TTL modes, switching between them is by pressing the button for 2 seconds. Users often mix up those 2 modes. Check details by YS-D2 User manual. Switch the mode of the strobe to another type TTL. 2) Set camera menu to 1/200 without FP. The #26308 board is in TTL mode then. "Green" indicator confirms TTL mode on the 26308 board. By the way, if you set it with "Auto FP", this command switches system to M mode. Pay attention, this command is assigned in firmware for switching TTL/M. "Blue" indicator confirms M mode on the 26308 board. This is described in User's Manual. 3) We don't know your 26308 firmware update, maybe you need -0.5 ev compensation set by menu, maybe not (if firmware is updated). Try both variants then. This is easy. 4) Rotary switch set to "3". This is position for YS-D2 ttl-profile. Rotate it around, set to "3" again, to be sure that rotor is clicked in exact position. This is just for check, but anyway. 5) Sometimes (rather rare), the LEDs installation by user is not accurate in the housing, it is important. Align the LEDs inside the optical bulkhead according the centre line of optical core. Push them forward by any tool, maximum deep inside, closer to transparent element inside the bulkhead. P.S. Hope finally you can find the reason in concrete setup. If not, i can help, shoot a video on days, - #26308 TTL board with Z7 and YS-D2, step by step setup and work.
  2. Hi Tom, Something is assembled wrong, or wrong parts. I can help regarding Subal TTL system, check your system step by step, better in messenger.
  3. Automatic identification of Z7/Z6 cameras appeared in TTL board #26308 only last months, was firmware update. If your TTL board was made some time before it, it means you have to set -0.5 ev (or -0.7 ev) "Flash Exposure Compensation" in camera menu by hands. This is easy. This note was in User's Manual when Z cameras had appeared on the market. Last time i tested Z7 camera with #26308 TTL board in the room a month ago, it worked normally. Also, pay attention, you have to use only new type (613-core) fiber optical cables Nauticam #26216, or #26217. This is important for YS-D2 control. Carefully read User's Manual of TTL-Converter and check if you set TTL mode (by menu command), or maybe you set M mode. TTL mode confirmation is GREEN light of onboard LED. YS-D2 by itself has rather narrow TTL range via optical input. Using this strobe, better set apertures F6.3...F22 underwater (ISO 200), to keep the system inside the working TTL range. Strobes must be not closer 0.35m to an underwater subject.
  4. Many LEDs have rise time 0.1 - 50 microseconds, dependently of LED model and application. However, i saw super fast LEDs with response time 3 nanoseconds in special application, but it was a rare case. I usually rate low-power LED's response time in microseconds, for common case. If you mean powerful LED arrays in high-current lighting applications, they can have significantly longer rise /fall time, very dependable of power source, schematic and other factors. Better measure it by oscilloscope in concrete case.
  5. For TTL control of S2000, better set 1/250 (without FP) sync speed. This case camera built-in flash makes mono pulse, and camera automatically restricts shutter speeds at 1/250. Another case, if you set any sync speed marked FP in menu, - camera flash makes 40 khz flicker, and also allows to set faster shutter speeds than 1/250. User can forget about it underwater, and get black strip on the image.
  6. Yes, Meikon bulkhead has rather special shape mount. But there is no problem with it. For TTL-Converter usage, UWTechnics will suggest 3 optional bulkheads as replacement: - Optical bulkhead / Sea&Sea style optical connector. For 2 strobes you can use HowShot Dual FO cable, for example, or another brand dual 613-core cable of new generation. - Electric bulkhead / Nikonos style. For 2 strobes you can use Sea&Sea Dual sync cord. - Electric bulkhead / Ikelite style. For 2 strobes you can use Ikelite Dual sync cord.
  7. S2000 strobe can not work with FP synchronization (fast synchronization, 40 khz flicker), it makes just a mono flash. That is why shutter window must be fully open at the moment of flash. So, officially you can use maximum 1/250 on D800 camera, as a sync speed. This is a speed of Nikon mechanical shutter mechanism. If you set faster speed (marked FP in camera menu), you get a black strip on the image (rear curtain is flashed). Camera Flash exposure compensation works for built-in flash. If you use it for S2000 control (in S-TTL mode), of course it affects to S2000 flash duration too.
  8. Yes, for Optical TTL you need just a standard kit. To be sure in technical details of that TTL board, you can look online User's Manual
  9. Hi Paolo, Different price may be dependently of optional products (if included). Standard kit includes TTL board, HotShoe cable, 2 pcs optical LED emitters with plastic adapters. This is most popular setup, purposed for Optical TTL usage. Optional products If user also needs Electric TTL via Sea&Sea Nikonos bulkheads, usually he requires electric cable adapters (1 or 2 pcs). This is optional product. There can be few variants, dependently of parts (UWT connector or original Sea&Sea connector, 1 or 2 pcs, etc.). Better specify optional parts when ordering. Maximum configuration includes 2 optical + 2 electric connections, simultaneously working in TTL. You can look such installation picture in Article here at Wetpixel.
  10. Hi Paolo, This is a new strobe, announced recently. Of course, UWTechnics TTL Converters works with it. Because this is just a typical 160w strobe with a round tube. It's ttl-profile must be very similar to Ikelite DS-160 or Subtronic Pro-160, which are supported by TTL Converter. If this strobe will be widely distributed on the market in future, It would be good to describe it's TTL more detailed. I can do it, but need a sample for tests, at least for 1 day.
  11. Sony TTL converter is in work now. Hope firmware will be ready in 1 month.
  12. Easy to update it at any diving exhibition (for example DEMA show, BOOT show, etc.), it takes 2 minutes. Also, you can send it to the factory for update, at any time. Contact UWTechnics by e-mail or Facebook.
  13. UWTechnics is in contact with Retra team regarding new strobe. When that strobe is ready, the TTL-profile firmware will be ready very quick too. I don't know the date of strobe release, no information for today. Of course, TTL-profile cannot be produced before the strobe. If you need TTL firmware update in future, you can make it at any time, this is easy.
  14. Yes, of course. If you have a single bulkhead on Meikon housing, you can use strobes in a pair either by dual fiber optic or by dual sync cord.
  15. Ok, my friends help me with that page copy. I marked the Warning about dual sync cord by red color: Electric input type in Z330 and Z240 strobes is identical, pulled up by resistor to +battery voltage. Inon realizes, if one strobe with better batteries has higher voltage on input lines than other strobe in a pair, this influence is not good for electronics. That is why Inon doesn't recommend to connect 2 strobes in parallel directly (without isolation diodes). As electronics engineer, i can understand such recommendation. But in concrete case, my opinion is that Warning is just overinsurance, by the following reason: Modern dual sync cords don't have direct parallel connection between 2 strobes. They have isolation diodes /transistors inside, which prevent influence of one strobe to another. The same isolation (using transistors) have UWTechnics TTL-Converters on the board. User can connect any pairs of strobes by sync cords, even different type strobes with different supply voltages, it does not matter. This is a system of isolation and safety onboard. And of course, user can use Dual Fiber Optic cables. For TTL systems the best are 613-core cables (Japanese optical core, 613 fibers inside). It has the best transmission index at our market now.
  16. May i ask you please show that page of Z330 User Manual ? I can explain what does INON mean there and other details.
  17. Hi, Meikon A7 series housings have 1 bulkhead of special shape mount. For TTL system user can change it to UWTechnics Optical Bulkhead or Electric bulkhead (Nikonos / Ikelite / S-6), all will be available in Meikon mount version. If you are interested in dual cables usage, i would recommend the following: - HowShot Dual Fiber Optic Cable 613L - Sea&Sea Dual 5-pin Sync Cord - Ikelite Dual Sync Cord Inon Double Hole Rubber Bush .... i would not recommend for this aim. It will work, but rubber is not reliable holder for longtime usage.
  18. I want to propose a discussion of various TTL systems that were not previously covered in the "Articles" partition of Wetpixel, including rare and serial versions, modifications of TTL technics, etc. Automatic flash lighting is interesting to many underwater photographers. Let's discuss the nuances of various TTL converters and underwater strobes, flash features of different cameras, connectors, pinouts, optics and electric, as well as installations of TTL system in various brands housings, etc. For my part, I will be happy to share information that i have, for those who are interested.
  19. Yes, everything should be so. YS-250 round tube has burning time 5 times longer than YS-D2 linear tube, because of tube shape. Such long flash lights picture all the time while open strip goes through the shutter window (HSS type shutter work at 1/250). This case picture is lighted by YS-250 uniformely. This is "pseudo-HSS" lighting, such trick of course works only with manual long flash, but this is not for TTL.
  20. Hi Balazs, I did not check A6000 yet. Maybe it has only 1/160. I don't know.
  21. Sony A7rIII has sync speed 1/250 only with Sony compatible strobes. Using other strobes, the real sync speed is 1/160. This is not written in camera Specifications. At 1/160 the shutter window is fully open at the moment of flash. At speed 1/200 the shutter curtains begin work as HSS, begins appear a small gradient on the top of picture, sometimes almost invisible. Yes, the 1/200 is a threshold value. At 1/250 there is a dark strip on the top of picture. In common case of underwater photography, user must have Sony TTL Converter inside the housing, to have 1/250 sync speed.
  22. Hello Alan, For DS161 strobes TTL control you have to use TTL-Converter for your housing. For example, UWTechnics internal TTL-Converter #11065, or external Ikelite. In case of usage #11065, the both strobes will work in TTL.
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