Lemme see ...
80 wing beats per second. The wings move maybe 5 inches per beat (x2 -- up and down). 10 inches times 80 beats = 800 inches per second.
So ...
Even at a shutter speed of 1/1000 the wings will be moving 800/1000 = 0.8 inches. Not really stop action. Methinks you need a shutter speed of around 1/4000 of a second and, even at that speed, the wings will move 0.2 inches. Still not really stop action.
That's the way I was roughly figuring to get the 250th of a second. Except I took the blurred portion estimated as a fraction (20-30%) of the full wing swing, and neglecting the sinusoidal-ish motion of the wing.
1 / (1/80 X .20 or .30 depending on the eyeball guesstimated fraction of the full wing swing.)
20% = 1/400th second
30% = 1/266th second
So I figured 1/250th as a "standard" shutter speed. (I know, newer cameras do not "open" to those oldey-timey fixed shutter speeds. But Road King Larry said he was using a chemical camera, so that seemed reasonable as a SWAG.)
I
told you that frequency sweep would drive all the critters nuts. I done
told you so.
I don't get no respect. No respect at all. <adjusts tie, fusses with shirt cuffs>
Terry