There's an assumption in this thread that the flare from an un-coated lens (or coated) is even across the frame which is going to be rarely true in practice, often it can be quite localised. LP Clerc in his book Photography, Theory and Practice, mentions internal lens reflections causing false ghost images, and also the extremes of the central flare spot.
The false ghost images are more like adding very weak additional slightly out of focus exposures to the primary exposure so quite different to a pre or post flashing exposure.
When you look at contemporary prints made by photographers like Kertesz, Brassai etc made before WWII they have a very subtle jewel like glow from the un-coated lenses they were using, their negative were exposed comparatively more than we would now and processed to higher contrasts but the papers of the time were suited to the negatives. Mostly the printed quite small even though they often used 9x12 cameras, modern prints from the same negatives look quite different and lose the jewel like quality.
Ian
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