Easy really -- get a reading with Weston Master V of scene by Incident Light so as not to be 'Fooled' with the Dark Loco and the Light smoke guess how much Depth of Field needed to be acceptably sharp -- so I think I set f6.3 and 1/125 th then set flash on the Auto Exposure setting to f2.8 so flash was UNDER-Exposed -- all done in a flash in my mind after Many Years of Practice !
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