| Sensor (mm) | Circle of Confusion (mm) | Focal Length (mm) | Focus distance (m) |
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| 20.48 | 0.0137 |
The Google Earth scene fit I did above gives a horizontal field of view of 50°
Is your stabilized version real-time? If so, the wing beat looks much too slow to be a fly, but rather a somewhat larger critter like a bird. Here's a chart of selected insect wing beat rates, from https://en.wikipedia.org/wiki/Insect_flight
Must admit, I wondered if it was an owl. Then I thought, it looks like a puffin- perhaps unlikely!
The highest recorded wingbeats for wild hummingbirds during hovering is 88 per second, as measured for the purple-throated woodstar
| Physical Size (mm) | Working Distance (mm) | Working Distance (feet) |
| 7 | 791 | 2.78 |
| 15 | 1694 | 5.96 |
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That's something you can always estimate independent of the camera parameters: if an object 17 pixels long travels in a straight line at 170 pixels per second, it's traveling at 10 times its own size per second. This is invariant under perspective: if we see the object at an angle, that shortens both its length and its flight path proportionally, so the relation holds.
Excellent observation, thanks!
| Physical Size (mm) | Size (pixels) | Lengths | Distance (mm) | Time (s) | Speed (m/s) | ||||
| 7 | 17 |
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| 15 | 17 |
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| 25 | 17 |
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| 3.2 m | 17 | 113 | 361 m | 1.12 | 322.7 |
One way to do it is the ICODE tag
for inline code which can do thisanother way to do it is the CODE tag
(choose "general code")Possible, but I think it's more likely a regular old housefly. Here's some I videoed at 240 fps in my backyard
I don't think we'll get the precise species - I tend toward housefly or similar because of the horizontal body (bees seem to be more tilted down at the back) and the downward sweep of the wing (bees don't seem to sweep down that far).
Heres a variety of flies in very slow motion
Source: https://www.youtube.com/watch?v=vEgJW02R7uc
Here showing the full downward (and forward) sweep of the wings. This is just takeoff, not level flight, so more body tilt here.
Compare:
I wasn't able to find anything on what speed to expect from a bottle fly, yet. Also, it's become apparent that you can't reduce a species wing beat frequency to some number... it is a generous span, and you can't exclude candidates as simplistically as I did with the house flies, though they still don't match with the estimated speed.
[...] Males of L. sericata are strongly attracted to wing flash frequencies of 178 Hz, which are characteristic of free-flying young females (prospective mates), significantly more than to 212, 235, or 266 Hz, characteristic of young males, old females, and old males, respectively. [...]
Sadly they haven't failed, they've sold a story to the faithful and they are lapping it up.
This is terrestrial technology.
Article: 
Article: DelFly Nimble is our newest and most agile design which can hover or fly in any direction (up, down, forward, backward or sideways). Unlike its predecessors, which are controlled like a conventional airplane via deflections of control surfaces located on the tail or behind the wings, the DelFly Nimble has no tail nor such control surfaces. Instead, it is controlled through insect-inspired adjustments of motion of its two pairs of flapping wings. The lack of the tail makes the DelFly Nimble less vulnerable to damage and highly agile, allowing also outdoors operation in light winds.
Here's the camera. A Photron NOVA FASTCAM
| FL | AoV |
| 22 | 50 |
| 24 | 46 |
| 26 | 43 |
| 28 | 40 |
50° horizontal field of view is what Google Earth gives me, matching the width of this image.
Travis ignores the suggestion that it's a flapping animal despite prompting.
Even the description of the preview video on the History channel calls it a creature.
