Chas Tennis

Lives in United States East Bay Area, CA, United States
Works as a Physicist (retired)
Joined on Oct 10, 2010
About me:

Now interested in high speed video for motion analysis of tennis strokes with a Casio EX-FH100.

Chas Tennis' recent activity

  • This approach seems risky for virus spread. When considering computer security issues, handing numerous SD cards from a number of computers, does not seem like a good idea. Sorry for the false start. ...
  • About 10 years ago there was a security issue for Quicktime for Windows PCs. Apple suddenly stopped supporting it for Windows PCs and I stopped using it. Has that changed? Kinovea will still view ...
  • I just did a test. File out of camera- 8 minute of tennis match video from Aiptek Action camcorder. .MOV 1080p x 720 60 fps 346 MB __________________________________________________ Viewed video on ...
  • I do not edit longer videos often. Recorded with tripod 28 minutes of 1080p x 720 60fps with a camera output file of .MOV Camera output video file size 1.2 GB Used a video analysis application that ...
  • Testing was very helpful to me. I wanted to know the Jello Effect distortions and how they might affect high speed videos of tennis strokes. For example, https://www.dpreview.com/forums/post/64078385 ...
  • ' Shutter Speed' I would say that the usage of the word ' shutter speed ' should indicate the duration of time that light exposes each elemental detector of a sensor array. It would apply to ...
  • Here is a thread for high speed video that includes some timing issues. https://www.kinovea.org/en/forum/viewtopic.php?id=435 CMOS cameras usually use a 'rolling shutter' readout and have Jello ...
  • 100 MPH = 1760" per second For an object moving at 100 MPH, it moves 1760" / fps between frames. 1760"/ 100 fps = 17.6 inches between frames. If you want to capture a tennis racket or baseball bat ...
  • Added 2 photos to their gallery
    20220312_090933 (1)Forum ServeHulg 9_3_2022
  • Added 1 photo to their gallery
    Forum ServeHulg 9_3_2022
  • Added 1 photo to their gallery
    Forum Served-quik
  • See the three Eiffel Tower pictures taken using multiple exposures ('burst mode'?). This catches the hand held camera motion at its stillest..... https://www.cambridgeincolour.com/tutorials/camera- ...
  • This Kinovea forum thread discusses motion blur. https://www.kinovea.org/en/forum/viewtopic.php?id=435 This approach gives you the motion blur of an edge on the object, in the object space, but not ...
  • Added 3 photos to their gallery
    Forum Forehand Med3 2_22_2022Forum Forehand Med2 2_2_2022Forum Forehand Med 2_2_2022
  • Added 1 photo to their gallery
    Forum Serve Sabalenka 2_24_2022
  • Added 1 photo to their gallery
    Forum Serve Salbelinka 1_21_2022
  • Your discovery is off topic. Keep it to yourself. On topic, is how to control your imaging exposure with a laser that is over exposing parts of your image. Do you have room light, walls?, a bright ...
  • Safety. Be very careful with lasers and your eyes. Search lasers and eye safety. Also, consider safety glasses that attenuate 532nm, but let you see the other wavelength bands. They make glasses ...
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Total messages 907
Threads started 87
Last post 1 day ago
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Photos uploaded 759
Last upload 1 month ago