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Today's first image from Ingenuity's navigation camera shows a remarkable lack of motion blur in the shadow of the rotors, despite them turning at 2600 RPM:

enter image description here

The factsheet tells us:

Navigation (NAV) Camera. This is a global-shutter, nadir pointed grayscale 640 by 480 pixel sensor (Omnivision OV7251) mounted to a Sunny optics module. It has a field-of-view (FOV) of 133 deg (horizontal) by 100 deg(vertical) with an average Instantaneous Field-of-view (IFOV) of 3.6 mRad/pixel, and is capable of acquiring images at 10 frames/sec. Visual features are extracted from the images and tracked from frame to frame to provide a velocity estimate.

It makes sense that for tracking visual features you'd want a short exposure to reduce motion blur. What was the exposure time?

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4 microseconds, as it seems like it was a Blackfly S camera. At least, that is the min exposure time possible with that camera. The sensor is Omnivision OV7251, according to the document of parts.

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  • $\begingroup$ That FLIR camera uses a very different sensor, how does it compare to the camera on Ingenuity? $\endgroup$
    – asdfex
    Apr 20, 2021 at 16:09
  • $\begingroup$ Many years ago, I built and programmed an image processing to watch probes in a centrifuge at 3000 RPM. About 4 microseconds to get sharp images. 4 µs of 20 ms for one revolution, that is 4.3 arcseconds to 360 degrees. The rotor moves 4.3 arcseconds or 0.072 degrees in 4 µs, $\endgroup$
    – Uwe
    May 20, 2021 at 20:24

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