« on: September 21, 2011, 05:06:38 PM »
Hi, K,I am trying to estimate the velocity of a pitcher (the radar gun I have does not seem to be not accurate) using a framed capture at 1/60th of a second.
Does the "scan" aspect of the FP shutter introduce any complication into your process? Perhaps with a shutter speed of 1/60 s it would not be a factor.
Is the travel of the ball parallel to the focal plane (or at a consistent angle to it)?
Doug: thanks for reading through my "blog" there.
I am afraid I have to plead ignorance to the ""scan" aspect of the FP shutter" question. This was a series of stills, the capture should have lasted 1/60th of a second in my mind.
The angles and other aspects of the ball line were far from perfect, for Pitcher 1, the 1d2 was handheld and there is vertical blurring, but it has little impact (little) on the horizontal trajectory. A +/- 5% margin of error is very much a given; the way i did the experiment, but I am getting an over 10% difference from expected result.
See the attached pictures and see what I mean. The blur of the ball is clearly different lengths. Pitcher #2 should be faster or equal to Pitcher #1.