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Thread: Pivot center
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Old 12-18-2008, 12:10 AM
Jeff Jeff is offline
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Join Date: Feb 2007
Posts: 701
Bigwill/Bond007

I agree that one cannot trust what one sees when looking at capture images of swing videos - especially when the frame rate is only 30 frames/second. I have seen swing videos where the clubshaft was bent 90 degrees. The reason is due to the fact that the camcorder is operating at 30 frames/second and it has multiple moving images occurring within that single frame time period (1/30th second) and the camcorder simply recreates a composite image according to the camera manufacturer's algorithm. Even the Bizhub Swingvision camera, which operates at 500 frames/second, may result in distortion when dealing with fast club speeds.

Here are capture images from that slow-mo section of the Sadlowksi swing video.



I put in image 1 for fun - to show his amazing clubhead lag.

Images 2-5 show the clubshaft movement through the impact zone. There was no frame that captured the clubshaft at impact.

Note how blurred the clubshaft images are - I cannot trust their accuracy even though this is a slow-mo swing video.

However, there is an interesting point. Look at the clubface sweetspot in relationship to the hand angle. I can believe that one can draw a straight line between the sweetspot and PP#3 and I can believe that the sweetspot is trying to get inline with PP#3. However, that GD photo of Jamie post-impact didn't look right to me - the hand angle didn't look right relative to the sweetspot. I still think that the sweetspot should have been where I drew the yellow line. I don't think that we can resolve this issue because even the GD photos, which were presumably taken with camera that has a very high shutter speed, may be distorting reality.

Jeff.