SSYTC047 GoPro High Speed Test

Ran a couple of tests with the new camera on its highest framerate setting.  Interesting results.

On the lathe, there wasn’t enough light, but I have some new ones worked out for when I am filming for real – the shed will look like it is residing in the near vicinity of the sun, and will be about as hot, but it will be good for any high speed shots.  Obviously, I won’t use those lights all the time, or even at full intensity, but they will be good when they are needed.

The GoPro is running at 240fps (frames per second), slowed to 12fps for the first test, and slowed to 25fps for the second (the lathe).  The lathe was running at 1000RPM.

SSYTC047 GoPro High Speed Test

11 Responses

  1. Very interesting. Looking forward to seeing some vids made with it in your new shed Stu.

  2. Stu,

    Nice demonstration of the slow-motion capabilities of the camera. It’ll be interesting to see what else you use it for.

    Chris

  3. Looks good Stu,Be good on other woodturning tools as you can see when it is in slow motion the cutting edge of the chisel working properly..good stuff

  4. Be even more interesting if the camera was closer to the work. Was that done with a GP2 or 3?

    • Hero 3 Black. Couldn’t get the camera much closer – it was only 12″ away for this view, and any closer would really start getting in the way. Once I have more room I will be able to position the mount in better orientations which may allow it to be even closer. It is a sport camera specifically, and not designed for this closeup work.

      I will be experimenting more, and looking at getting closer views (as I did with the egg), but it will be shots specifically for the high speed, and so a compromise in access and limited view would then be ok. I need the new lights (2x500W Fresnels) for that as well – the shutter speeds for 240fps need a decent amount of light.

      There are other cameras that can really get in there, but the price jumps almost 50 fold. If anyone knows of high speed cameras in the GoPro price bracket which can do better I would be interested to know (240fps or more).

      • Okay, interesting. I have a Hero 2 and might give it a go on the Vicmarc later today.

      • Also, you wouldn’t see the wood chips flying around (looks pretty cool!)

        Is there any reason why you’d want to use 2x500w fresnels? I could not help but notice that part of your picture is “blown out”; overexposed. This can happen if you focus your light too much. Personally, i’m a big fan of flourescent lights. They are very soft by nature and perfect to evenly lit your lathe.

        Curious about your next videos!

        • Hi James,

          A fresnel is by its design a diffuse light source, so unlike the LED spot light that was used to illuminate the blank in this video, these should produce a much more even flood of light, and avoid the burnt out regions. The light used in the first video was the only one I had to hand, and is used when I turn, but my eye has a lot greater dynamic range than the GoPro (or any other camera!)

          Fluros can also achieve a pretty diffuse light (and both the old, and the new workshops were, and will be illuminated by them), but unless one is mounted closer to the work, they don’t produce sufficient light for the very high speed shutter speeds needed for the high frame rate.

          Most of my videos to date have used fluros – the high speed needs something a bit more, and these fresnels (now 3 in number) will hopefully produce the results I need. Hoping to run another test tomorrow – the fresnels have arrived and are standing by!

  5. Hi,
    The slowmo sound effects are just as impressive when you knock the corners off you don’t hear that at normal speed.
    Regards

    • Had forgotten to listen before posting the video – is interesting. One of the interesting points is that the sound and video seem to be out-of-sync. However, when a chip hit the camera, it sounded like the timing was fine.

      I am therefore curious, and haven’t done the maths, but is it a matter that the framerate is so fast that the distance between the work and the camera means the speed of sound is actually apparent?!!

      Will have to calculate it out, see if the distance is actually a factor. I wouldn’t have thought so, but I haven’t played with this degree of highspeed shot before.

      • Tried calculating it out. At 340m/s, over a distance of 0,5m, there is 3.5 frames from the point the chip leaves the surface until the time the sound arrives at the camera. Assuming (wrongly), no delay in the camera itself, I’d still think it unlikely that a 3.5 frame difference can be detected easily at 25 fps PAL.

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