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2 minutes ago, ianmarsh said:

1) The Retra is "Brand Agnostic" in the sense it can be used on all camera platforms as long as there is a controller available for that brand. Otherwise it is a simple manual strobe.

It can shoot manual or TTL when you have a TTL-capable triggering flash, like a pop-up flash on many compacts and mid-size cameras.

4 minutes ago, ianmarsh said:

4) The Smart SL feature on Retra is a way to bypass the TTL underwater if you choose to shoot manual, once the board is set up for TTL and the housing closed. It ignores the pre-flash TTL pulses and just fires the strobe. Output will be dependent on the power setting on the back of the strobe. Not sure if this thinking is correct?

5) Not sure what would happen if the Retra strobe was set at the "Manual" on position #1 and the TTL board was set in TTL mode? Would it accomplish the same thing as 4) above? 

The Smart SL mode allows the strobe to 'learn' the TTL pre-flash sequence of the controlling camera; you don't use it to actually shoot. Engage Smart SL - the strobe indicator light will start flashing. Fire a shot, wait for 2 seconds, it should stop flashing - this indicates that the strobe is calibrated. Turn to manual mode and start shooting - it will ignore the TTL pre-flash pulses. This is for cameras where you can't turn off the pre-flash, like all Sony RX100 and A6xxx series cameras.

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On 3/8/2020 at 10:53 AM, ianmarsh said:

Got it! Thanks

 

ian

Correction - I finally got them in the water today, triggering off the pop-up flash on my Sony A6300, and turns out I was wrong about how the Smart SL mode works. There is no need to turn back to manual mode - I set the strobes to U2 (Smart SL), they start flashing yellow, I take a random shot to make the camera flash fire and they turn solid yellow. From that point on, every time I take a shot, they ignore the pre-flash (which cannot be turned off on my camera) and the power is adjusted using the left knob. If I turn the right knob to a different mode (TTL, turn off, whatever) then a new engagement of U2 (Smart SL) requires a new calibration shot. The knobs themselves are a joy to operate by the way - today was the first time I shot manual strobes and I was able to get it going almost right away.

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Sounds great, Barmaglot. Thanks!

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So then the Retra strobe Smart SL circuit works somewhat like the magnetic reed switch for the ACC on an Inon strobe? Magnet in to ignore preflash and magnet out to emulate preflash except now it is done by a calibration shot per the operating mode desired? Kind of confusing, as if the magnet switch were not ;). 

 

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It's actually pretty convenient; I was switching between TTL and manual mid-dive today without issues. 

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