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This is 100% an HSS + EFCS issue. My A6300 will start to band in HSS after around 1/500 with the normal shutter setting (EFCS On). Need to disable EFCS to solve this. These cameras use what's equivalent to 50% silent shutter by default. The shutter doesn't need to open to start the exposure with EFCS, so the camera starts it by immediately reading the sensor line by line, which creates the banding.
Disabling EFCS will cause a double shutter reaction:
1. The shutter will close as soon as you hit the shutter release button.
2. The shutter will open to start the exposure.
3. The shutter will close again to complete the exposure.
It's not as instantaneous as EFCS On, but it's not terrible like DSLR Live View (similar function).
And yes, banding will also be caused by using the silent shutter indoors with artificial lighting. Similar issue, but a different way of achieving it. Only a global shutter will solve these problems.
Now, for a solution, one thing you can do is to shoot an evenly lit wall/foam board with the same settings and flash/strobe/artificial lighting. Fire off a few shots, as the banding will move around a bit. Then you can add one of those images as a layer over the original banded image in PS (16-bit TIFF), invert the color, and use it as a luminosity layer to cancel out the lines. Note that if you use anything like Clarity or Dehaze, they will alter the edges of the banding, so save that for a final trip in your RAW editor.
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