Ahh, the rear curtain thing is Cannon specific? Any idea how Nikon does things? I would need to make my own (or buy) the hot shoe adapter and also double check that my Subal has room to fit that, but it is something I've wanted for backup (or primary, and keep the electrical as backup)
El-cheepo Nauticam Optical trigger
Posted 28 November 2018 - 10:36 PM
With a bright flash from a cameras intetnal flash tube, you can get away with higher losses in the fibre from single strand cables and still have enough light left at the far end to trigger a strobe.
With a relayively weaker pulse from an LED, the cables need to be as efficient at passing light from one end to the other as possible.
Personally, I'm using the howshot brand multicore ones.
Posted 08 January 2019 - 10:18 PM
I believe it should work with Sony. Next time I catch up with a friend who has an A7RII, I'll see if he minds if I try it on his camera.
Oh, and I tried the V5.6 board shown above with the YSD2 - they fire just fine!
Posted 29 March 2019 - 09:37 AM
Any chance you might publish the circuit diagram and parts list, so it can be adapted for other uses?
Many thanks, elias
Posted 17 April 2019 - 07:28 PM
I could do... let me give it some thought. It took me quite a while to design and tune the circuit for optimum performance.
Also, all of the components are only available in tiny packages like SOT-23 which there is pretty much no way to use without hot air soldering and custom designed PCBs.
In short, it is some schmitt inverters, logic gates, and an RC circuit to control the time length the LEDs turn on for when triggered.
I've got the Canon E-TTL protocol completely worked out now, and can get a Attiny chip to read the communication (MOSI/CLK) from a 5dmk3 to a 580EX2 speedlight and give the correct output responses (MISO) - proving my modeling of the protocol is correct. It is incredibly similar to the SPI protocol, but I have had to do some trick work to get it to function correctly with the Attiny chip.
I've also tested this protocol model with other Canon cameras my family own such as a 7Dmk1, 20d and G12 - it successfully works for all of them. Now I just need to design a circuit board to fit in my housing...
Edited by Bevanj, 17 April 2019 - 07:37 PM.