"Really it was discussed in the past and some modern military guys confirmed this..."
I've been an AA gunner in the Swiss army: for years, I shot during military courses with 20mm AA canons and saw many times too 35mm canons firing.
I never saw, even at night, flames in my gunsight.
In fact, flames can be seen (and not always, depends of the shutter time, exposure and weather conditions) on pictures or videos, but there are almost invisible to the human eye, because the flashes are too fast and very transparent too.
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