TimG 62 Posted December 25, 2016 Not if you are using the onboard camera flash as your control signal. See Pavels item #5 in post 10. Different strobes have different power discharge curves which really means they take different lengths of time to fully fire. Your onboard flash is fast and weak. Your external strobe is much more powerful but slower. So the fast weak flash tells your strobe to stop firing too soon. For proper full power fumction you need a controller that speaks digitally to the camera and has been calibrated for your strobe. Many thanks. Yeah, that's what I understood from Pavel's really helpful explanation. It was just Adam's comment on the TRTL that made me raise the question. I thought the TRTL would overcome that problem. Share this post Link to post Share on other sites
Pavel Kolpakov 74 Posted December 25, 2016 (edited) We have the the TRTL here and waiting to test. One idiosyncrasy of TTL is that you cannot get full strobe power with it. I also did not test that board yet. Thanks for the technical information. Edited December 25, 2016 by Pavel Kolpakov Share this post Link to post Share on other sites
Pavel Kolpakov 74 Posted December 25, 2016 (edited) .. Edited December 25, 2016 by Pavel Kolpakov Share this post Link to post Share on other sites
TimG 62 Posted December 25, 2016 Shurely you have nothing to do today, Adam? You could be testing that TRTL..... Share this post Link to post Share on other sites
KeithG 21 Posted December 25, 2016 Many thanks. Yeah, that's what I understood from Pavel's really helpful explanation. It was just Adam's comment on the TRTL that made me raise the question. I thought the TRTL would overcome that problem.Trtl should not have the problem since it connects to the hotshoe. Share this post Link to post Share on other sites
TimG 62 Posted December 25, 2016 Trtl should not have the problem since it connects to the hotshoe. Thanks. That's what I figured. Looking forward to Adam's review! Share this post Link to post Share on other sites
TimG 62 Posted April 16, 2017 I see a Subal now have the V2 TTL system on sale on their website. Anyone have any experience of it yet? Elmer? Pavel? Really helpful review of the Turtle on the latest UWP. Share this post Link to post Share on other sites
Pavel Kolpakov 74 Posted April 17, 2017 (edited) I see a Subal now have the V2 TTL system on sale on their website. Anyone have any experience of it yet? Elmer? Pavel? Yes, i tested that V2 board (white color PCB). It has very nice TTL accuracy. And the 100% power of underwater strobe is available for TTL control by that board, another words it has full-size TTL (!). Certainly, full-size TTL is available only for fully controllable strobes. Tested strobes: YS-250, DS-161, YS-D1, YS-D2, Z-240. The board has a switch for those strobe types. There are 2 pcs Optical TTL outputs and 2 pcs Wire TTL outputs onboard. Also, there is 1pc wire TTL connector for Nikon land strobe, because Subal also produces housings for SB-910/ SB-900. New V2 board supports +/- TTL Flash Exposure Compensation (by camera wheel), TTL/M modes switching underwater, Manual flash power setting by camera wheel (in M mode). These features already became a good tradition for modern TTL products. The same features exist in Nauticam #26308 board, UWTechnics #11031 board and External #13038 converter, Aquatica TTL board, Hugyfot TTL board. Edited April 17, 2017 by Pavel Kolpakov Share this post Link to post Share on other sites
TimG 62 Posted April 17, 2017 Thanks Pavel! Sounds good. Share this post Link to post Share on other sites
JohnnyQuest 8 Posted April 17, 2017 Does anyone know if any manufacturer is working on a similar TTL device for Canon? More specifically, for the 5D Mk iv? Share this post Link to post Share on other sites
TimG 62 Posted April 17, 2017 Check out the Turtle: http://trt-electronics.com Share this post Link to post Share on other sites
TimG 62 Posted April 17, 2017 Pavel, do you know if the V2 kit comes with the hot shoe to fit on the camera and connect to the V2 board - or is that an extra? Share this post Link to post Share on other sites
Pavel Kolpakov 74 Posted April 17, 2017 (edited) Pavel, do you know if the V2 kit comes with the hot shoe to fit on the camera and connect to the V2 board - or is that an extra? Tim, sorry, i don't know. But usually HotShoe connector exists in each Subal housing. User has to change only the board. No necessity to buy extra HotShoe. Edited April 17, 2017 by Pavel Kolpakov Share this post Link to post Share on other sites
Pavel Kolpakov 74 Posted April 17, 2017 (edited) Does anyone know if any manufacturer is working on a similar TTL device for Canon? More specifically, for the 5D Mk iv? UWTechnics is also preparing Canon TTL for the market now. Product will be available soon. Edited April 17, 2017 by Pavel Kolpakov Share this post Link to post Share on other sites
TimG 62 Posted April 17, 2017 Tim, sorry, i don't know. But usually HotShoe connector exists in each Subal housing. User has to change only the board. No necessity to buy extra HotShoe. Thanks Pavel I've got a Subal ND800 with only the fibre optic ports - no wired ones. So there is no hot shoe connector. I suspect I'll have to buy one..... I'll ask Subal and report back. Share this post Link to post Share on other sites
Pavel Kolpakov 74 Posted April 17, 2017 (edited) Thanks Pavel I've got a Subal ND800 with only the fibre optic ports - no wired ones. So there is no hot shoe connector. I suspect I'll have to buy one..... I'll ask Subal and report back. If you plan to use optical TTL synchronization, ask Subal about new plastic inserts for LEDs installation, for replacement of standard clear inserts in the housing. I don't know, maybe new inserts are included, or maybe Subal suggests any other way for LEDs installation now. Better specify it. If you want to use wire TTL synchronization, - this is more easy, simply connect Nikonos bulkheads to V2 onboard sockets. Edited April 18, 2017 by Pavel Kolpakov Share this post Link to post Share on other sites
TimG 62 Posted April 17, 2017 Oh right - thanks. I'll ask about that too Share this post Link to post Share on other sites
JohnnyQuest 8 Posted April 17, 2017 Check out the Turtle: http://trt-electronics.com Thanks, but I've contacted them, and I've been told they are still testing it. They still can't confirm that it works with the 5D mkiv. The UWTechnics information sounds promising. Thanks Pavel. Share this post Link to post Share on other sites
Pavel Kolpakov 74 Posted April 19, 2017 (edited) The UWTechnics information sounds promising. Thanks Pavel. UWTechnics TTL board works with all Canons, including newest cameras 5Dm4 and 7Dm2. Edited April 19, 2017 by Pavel Kolpakov Share this post Link to post Share on other sites
brandoncole 3 Posted April 19, 2017 Pavel- On the Reef Photo web site I see that your UW Technics NN-2/IS works with Nikon cameras. Please advise which product works with Canon cameras, and where can one buy it? Where can one read more about it? Thank you, Brandon Share this post Link to post Share on other sites
Pavel Kolpakov 74 Posted April 19, 2017 (edited) Please advise which product works with Canon cameras, and where can one buy it? Where can one read more about it? Hello Brandon, For today that product is not announced yet. Press release will be soon. Edited April 19, 2017 by Pavel Kolpakov 1 Share this post Link to post Share on other sites
buddy 7 Posted April 21, 2017 Yes, i tested that V2 board (white color PCB). It has very nice TTL accuracy. And the 100% power of underwater strobe is available for TTL control by that board, another words it has full-size TTL (!). Certainly, full-size TTL is available only for fully controllable strobes. Tested strobes: YS-250, DS-161, YS-D1, YS-D2, Z-240. The board has a switch for those strobe types. There are 2 pcs Optical TTL outputs and 2 pcs Wire TTL outputs onboard. Also, there is 1pc wire TTL connector for Nikon land strobe, because Subal also produces housings for SB-910/ SB-900. New V2 board supports +/- TTL Flash Exposure Compensation (by camera wheel), TTL/M modes switching underwater, Manual flash power setting by camera wheel (in M mode). These features already became a good tradition for modern TTL products. The same features exist in Nauticam #26308 board, UWTechnics #11031 board and External #13038 converter, Aquatica TTL board, Hugyfot TTL board. Does anybody know if this Subal V2 also work with the latest Subtronic flash (Pro160 / Pro160 Fusion)? Asked Subal directly some time ago, they wanted to test this but never got an answer on it though... Thanks Share this post Link to post Share on other sites
Pavel Kolpakov 74 Posted April 21, 2017 (edited) Does anybody know if this Subal V2 also work with the latest Subtronic flash (Pro160 / Pro160 Fusion)? Asked Subal directly some time ago, they wanted to test this but never got an answer on it though... Thanks Officially, Subtronics are not in list of compatible strobes yet, only planned for future. For those strobes must be build separate TTL curves in TTL Converter firmware. At last Dusseldorf Boat Show, using a case, I tried V2 board with Subtronic 160 /270 strobes (by wires), just for interest, - yes TTL worked, but it required some corrections. Edited April 21, 2017 by Pavel Kolpakov Share this post Link to post Share on other sites
buddy 7 Posted April 21, 2017 Officially, Subtronics are not in list of compatible strobes yet, only planned for future. For those strobes must be build separate TTL curves in TTL Converter firmware. At last Dusseldorf Boat Show, using a case, I tried V2 board with Subtronic 160 /270 strobes (by wires), just for interest, - yes TTL worked, but it required some corrections. Hi Pavel, thanks for the headup! Some corrections, can you elaborate a bit? Another question: I read (I guess it was from you) that with this it is also possible to change underwater from TTL to manual and then even change the power of the strobes by turning the aperture/shutter wheel on the camera? Is this really true and can you elaborate on this as well? Will be deeply appreciated... Juerg Share this post Link to post Share on other sites
Pavel Kolpakov 74 Posted April 21, 2017 (edited) Hi Pavel, thanks for the headup! Some corrections, can you elaborate a bit? Another question: I read (I guess it was from you) that with this it is also possible to change underwater from TTL to manual and then even change the power of the strobes by turning the aperture/shutter wheel on the camera? Is this really true and can you elaborate on this as well? Will be deeply appreciated... Juerg Hi Juerg, For Subtronic i set -/+ Ev camera "Flash Exposure Compensation" for -0.5...-1.0Ev then. I don't remember the exact value. Converter firmware understands such correction. Pay attention that this is rough solution for this aim, it does not solve the issues totally, because TTL curve has rather complicated shape. But it works acceptable in medium conditions sometimes. The best solution will be to build separate full curve for Subtronic. I think, it will be done in nearest future. Modern TTL boards have possibility to switch TTL/M underwater. Usually, in menu any free camera function can be assigned for this aim. If you mean V2 board, user has to choose "Auto FP" in camera menu for switching TTL/M. This command "Auto FP" is assigned for Manual mode in Converter's firmware. In this Manual mode TTL Converter does not make pre-flashes, but only the main flash. In such Manual mode the TTL Converter firmware can adjust uw strobe power manually. User rotates camera wheel and looks digits on camera service screen, the same digits are in the viewfinder display. Camera function "Flash Exposure Compensation" becomes assigned automatically for this functionality by Converter's firmware in this mode. So, there are 17 available steps of power, - this is much better than usually suggested by the strobe's own dial switch. And this is more comfortably, because user adjusts lighting keeping hands on camera. I use this feature rather often, shooting currently with #11031 TTL Converter. Edited April 21, 2017 by Pavel Kolpakov Share this post Link to post Share on other sites
