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    A laser pointer at 2B FPS [video]

    (www.youtube.com)
    615 points thunderbong | 11 comments | 19 Oct 25 06:42 UTC | HN request time: 0s | source | bottom
    1. dist-epoch ◴[20 Oct 25 21:33 UTC] No.45649665[source]▶
    Techniques like this are/were used to film nuclear explosions (but with a single explosion).
    replies(2): >>45650007 #>>45650099 #
    2. 01HNNWZ0MV43FF ◴[20 Oct 25 22:03 UTC] No.45650007[source]▶
    Scanning a single pixel over an image? How does that work with an explosion? The laser pointer is reproducible
    replies(1): >>45650312 #
    3. throw327489 ◴[20 Oct 25 22:14 UTC] No.45650099[source]▶
    Who detonated 2073600 bombs?
    replies(1): >>45650674 #
    4. bob1029 ◴[20 Oct 25 22:37 UTC] No.45650312[source]▶
    https://en.wikipedia.org/wiki/Rapatronic_camera
    replies(2): >>45650387 #>>45650451 #
    5. snitty ◴[20 Oct 25 22:45 UTC] No.45650387{3}[source]▶
    But that bears no relation to what happened in the video.
    6. masfuerte ◴[20 Oct 25 22:54 UTC] No.45650451{3}[source]▶
    The rapatronic camera had an incredibly fast electronic shutter. To record a video they needed one camera per frame. Rather like "bullet time" in the movies. The technique in the youtube video is completely different.
    replies(1): >>45650589 #
    7. fluoridation ◴[20 Oct 25 23:10 UTC] No.45650589{4}[source]▶
    It's not completely different. I'd argue it's the exact opposite. Instead of using a single single-pixel camera to record video of a repeatable event, a sequence of regular film cameras captured photographs of an unrepeatable event.
    8. monster_truck ◴[20 Oct 25 23:25 UTC] No.45650674[source]▶
    They did the way more expensive version briefly mentioned towards the start of the video, having 12+ cameras with ridiculously fast shutters (as low as 10 nanoseconds) arranged to run in seqeunce.
    replies(1): >>45651298 #
    9. fluoridation ◴[21 Oct 25 00:58 UTC] No.45651298{3}[source]▶
    That was probably not the more expensive version in that case.
    replies(1): >>45651379 #
    10. quakeguy ◴[21 Oct 25 01:09 UTC] No.45651379{4}[source]▶
    Why?
    replies(1): >>45651454 #
    11. reverius42 ◴[21 Oct 25 01:23 UTC] No.45651454{5}[source]▶
    Because of the cost of making and detonating so many bombs.