?????rolling shutter effect on golf swing????

I decided to make a video of my golf swing for training purposes with my flip camera. As I was going frame by frame I noticed the shaft flex is very strange. This was a concern to me as these are brand new clubs that I was fitted for and pretty expensive. Before I go to Golf Galaxy and raise hell, I just want to make sure that what I'm looking at is not simply a classic case of the rolling shutter effect.
It almost seems like it is but I the only distortion is in the center of the shaft. I would think rolling shutter would cause more distortion in other areas as well....i.e. arms/hands & the club head where the speed is highest.

Anyway, here's an example......

I'm no expert on shooting golf swing video or analyzing the results, but something doesn't look quite right with the club in your examples.

Yes, a club should 'flex' and 'kick' through the hitting zone, but certainly not like that! It appears to be some sort of visual distortion going on.

What clubs and shaft with your new irons?

dave

Interesting effect!. I would think that the club should flex in the other direction if this is on the downswing. Something does not look right. Now I am going to have to go hit some balls and video taped myself and roll it back in slow mo.

Bob

They're Mizuno MX300's with stiff flex steel shafs. I know some flexing is normal but it almost seems physically impossible for the flex to be in that direction at that point in the swing. If anything, I would expect it to be flexed the other way.
I posted the video on a golf forum and someone suggested it might be rolling shutter effect. I did a little research and it seems this is most likely the cause but from the examples I've seen I cant say for sure. From what I've seen of the rolling shutter it produces diagonal lines instead of vertical where motion is present. My pictures have a curved effect, but I suppose it's not out of the question for the shaft to flex like that.........

You should try shooting at the "proper" 180 degree shutter speed. At 24p that would be 1/50th.

Typical rolling shutter would exhibit the exact opposite distortion - CMOS scanning from top down, making the top of the frame update before the bottom, so the club would look bent in the other direction.

What kind of camera is this? This might make sense if its sensor scans bottom-up or right-left. ? very weird

bpaulette wrote in post #9957151
Typical rolling shutter would exhibit the exact opposite distortion - CMOS scanning from top down, making the top of the frame update before the bottom, so the club would look bent in the other direction.

What kind of camera is this? This might make sense if its sensor scans bottom-up or right-left. ? very weird

I used a flip video camera. I know its not a DSLR video, or Canon for that matter, but I figured someone here would be able to tell if it's some kind of distortion caused by the camera. Again, I also cannot rule out the shaft flex itself but it seems highly unlikely. Thanks to all that have replied so far.

mayerk wrote in post #9957596
I used a flip video camera. I know its not a DSLR video, or Canon for that matter, but I figured someone here would be able to tell if it's some kind of distortion caused by the camera. Again, I also cannot rule out the shaft flex itself but it seems highly unlikely. Thanks to all that have replied so far.

Easy answer: Go back to the course, set up your camera on a tripod with a high shutter speed. Wireless remote or self timer. Nothing will put your mind at ease like irrefutable proof that such flex isn't actually there and is actually a product of the camera.

TheBurningCrown wrote in post #9957664
Easy answer: Go back to the course, set up your camera on a tripod with a high shutter speed. Wireless remote or self timer. Nothing will put your mind at ease like irrefutable proof that such flex isn't actually there and is actually a product of the camera.

easier said then done. I may have to hit a thousand balls before I get a similar swing position using a timer. wireless remote would be even harder with both hands on a golf club.

here's a link to the video if it helps at all.....
http://s35.photobucket​.com …urrent=golf2.fl​v&newest=1

mayerk wrote in post #9957726
easier said then done. I may have to hit a thousand balls before I get a similar swing position using a timer. wireless remote would be even harder with both hands on a golf club.

1.) Use a footswitch.
2.) Borrow a friend!
3.) High FPS mode!

There are more but I shall not continue

This effect is entirely due to the camera. It must be reading the bottom of the image first and scaning up.

The only way you can fix the way you want the shaft to look is by filming the action with the camera upside down and then post processing flipping the video the right way up again.

Offcourse the shaft will look a LOT more bent that what it actually is in reality.

hqqns wrote in post #9959290
This effect is entirely due to the camera. It must be reading the bottom of the image first and scaning up.

The only way you can fix the way you want the shaft to look is by filming the action with the camera upside down and then post processing flipping the video the right way up again.

Offcourse the shaft will look a LOT more bent that what it actually is in reality.

Unless you swing backwards, you are backwards there. Signal wise, it is indeed going from top to bottom, with the swing being fast enough that we have a 30 degree offset. If we knew the framerate and "shutter" speed, you could probably calculate the angular velocity as a function of rolling shutter rate

LSV wrote in post #9959433
Unless you swing backwards, you are backwards there. Signal wise, it is indeed going from top to bottom, with the swing being fast enough that we have a 30 degree offset. If we knew the framerate and "shutter" speed, you could probably calculate the angular velocity as a function of rolling shutter rate

Had another look at the images and offcourse you are right. I stand corrected

You could do that but it's probably done more easily and accurately if you use two frames and just look at how far the head of the club has moved in a certain amount of frames apart