Oh, hell. If you’re advanced enough to cross interstellar space just to sightsee, would you be concerned about life forms principally armed with crude projectile weapons, flagpoles, and such? I’m sure if they detect a trace of hostile intent they can explode your skull from orbit.
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Here’s an article from a few years ago about the Zeiss (Super Speed) B-Speed lenses. It seems unbiased, as it has nothing at all to do with UAPs. It’s a nine-blade lens, not a 3-blade, but apparently the resulting iris is triangular. The relevant part reads:
Speed aside, one of the most defining features of the B-Speeds is their triangular iris configuration. Despite the lenses have a 9-bladed diaphragm, the shape produced is a unique, unmistakable triangle. Wide-open, the lenses produced beautiful round bokeh, but as soon as you stop down… Triangle bokeh!
What’s in a Name? A Guide to Zeiss Super Speeds – The Cine Lens
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Every lens ever made does that. It takes the diaphragm literally out of the picture. Fancy photography lenses strive, with both curved and high numbers of diaphragm blades, to maintain that quality stopped down. But of course different types of imaging have different priorities.
ETA it could be, at least I suspect, that a triangular diaphragm may help in low-light or other situations. I don’t know jack about the physics and engineering of lens design.
For you, maybe, but IOKIYAR.
It now reads: Basket of deplorables.
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Have spent many years reading and studying ancient Egyptian texts, and damning the aliens for not sharing “punctuation technology” with the ancient Egyptians along with anti-gravity. Would have made things a lot easier.
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agreed! 
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Not while actively piloting, no.
There’s a degree of compartmentalization involved.
if 1 percent of Americans are schizophrenic, doesn’t that actually mean that at least 2 percent of Americans are schizophrenic?