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How to shoot continuous frames with the A9 and external flash, my findings (by Alin Popescu)

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How to shoot continuous frames with the A9 and external flash, my findings
by Alin Popescu – Sony Image Ambassador, Romania

My very first frustrations with the A9 and event photography was the use of flash in different situations. This was actually my only complain about this magnificent camera.

What bothered me most, except the lag before the shot was taken, was that it was almost impossible for me to take continuous sequences with flash, without getting a miss or two, and by that I mean a flash-missfire or out-of-sync during the continuous shoot. I knew Sony cameras can do it, since the launch of the A7R III back in London when we shoot at 10fps with Profoto gear.

So today I tried everything I could, with every setting I imagined it might have a “saying” in this situation and I’ve finally found the “perfect” solution. I’m not saying I’ve discovered the wheel, maybe I was too stupid and did something wrong before, but trust me, I’m no beginner at this.

What I did?

First of all, I’ve upgraded all my equipment to the latest firmware. So this is what I’ve used:

Sony A9 – v. 2.0
Sony Zeiss Distagon 35mm f 1.4 – v. 02
Godox Wistro AD600B – v. 2.5
Godox X1T S – v. 16

Even if the Godox is the TTL version, for consistency between frames, I prefer to go full manual and set the trigger accordingly to shoot at 1/32 power.

A9 was on continuous M and Mechanical Shutter (the only way you can use flash on the A9), at 1/125s and F4, with an ambient value at -2.0 EV so I could clearly see if a no-flash shot happened during my sequence. ISO was set to 100 for no variation either and focus was AF-C.

I’ve filmed this with my iPhone on Slow-Mo at 240 fps, just to be able to “see” if flash popped at every shutter opening.

What I’ve discovered?

The lag we all noticed before is still present, but only at the first frame of the sequence. You can see in slow-mo, the complete black-out of the LCD, just before the first flash was fired, and then no black-out or any other lag. I’ve tested also afterwards if focus is working accordingly and it did, moving the camera to close and distant objects, did the trick.

What is to be solved? This mysterious blackout at the initial start of shooting. I have no explanation for this, since it wasn’t a TTL sequence I could blame on, as the flash/camera needed to perform pre-ttl flash to measure everything. Hope Sony will give us a no-lag system soon, but until then I’m happy I can shoot sequences without missed frames.

Please let me know of your findings!
aLLin

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