EF-610 DG Super - AF Auxiliary Light
I don't have the EF-160 but one idea is to use one of those green or red laser pointer/pen to shine a beam at the AF target point, in the hope that it is bright enough and therefore will not trigger the AF illumination from the flash. It might work, give it a try ! And if it does work, one can then lock the AF by switching to MF, and fire away ...
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