Brad Simmons
October 12th, 2003, 11:54 AM
Ok folks, my Glidecam V8 finally arrived a few days ago! I have spent the last two days reading the manual thoroughly (which reads like an 18th century novel). I need some help determining whether or not my Glidecam is properly balanced. Please bear with me as I am about to write my own novel here.
I was able to construct the sled fine. Now, before I actually put on the rig, I just want to make sure that I have my horizontal and vertical balance set correctly, which I am doing using the balancing bracket on a C-stand as suggested. I don't want to start running around and practicing this thing until I know I have it balanced.
I am using a Canon XL1s. Now, I DO have a nice Nebtek LCD monitor, but I figured for now I just want to figure out how to balance the thing with the counterweight disks. Also, I stripped my XL1s of everything, so it's basically just the standard camera package, standard auto lens...no add ons for now. According to the Canon manual, the default package weighs 6 pounds. Therefore, I added three weight plates underneith the camera to make the recommended 9 pounds for my camera.
Left to Right Balance
Ok, so I start working on the horizontal balance. The XL1s is obviously very front heavy and a little left heavy. However, I think I have got the best results from mounting the camera onto the center of the plate, a little back instead of over to the right. Then by adjusting the mid plate with the allen wrench, I can slide the midplate over and back more to compensate for the camera. The only annoying thing about mounting it in the middle, is if you are using a quick release plate, you can’t remove the camera as the QR plate adjuster knob rests too close to the weight plates and can’t be turned. Kind of annoying as the quick release plate essentially then serves no purpose. As I'd have to take off the camera plate to remove the camera, I might as well just not even use the QR plate and just bolt the camera right onto the weight plates.
When mounted on the C stand, my horizontal balance is pretty good. However, it is hard to tell. The reason is it seems wherever I place the sled a tiny bit off the axis, it seems to float there. If I lighty touch the sled and tilt it a TINY BIT right, it will somewhat stay there. Which makes me think it’s too right heavy. However, if I lighty touch the sled and tilt it a tiny bit left, it pretty much stays there too, which makes me think it’s left heavy. Again, if I position the sled with my hand to make it perfectly verticle, it stays there and I think its balanced. I am confused a bit because the manual says that whenever you do a tilt or pan, the sled should always go back to perfect verticle when you release. Mine is sort of doing that, but not really. If I make a hard tilt to the right, yes…the camera starts to swing back to it’s verticle position, but the sled ends up with the top a little bit to the right, maybe 5 degrees or so. (Imagine the sled as a SLIGHT diagonal line going from bottom left to top right). Likewise, a hard tilt to the left will swing back to verticle, but end up a little bit to the left of verticle, 5 degrees. I hope I am making sense. So I am unsure how to correct this problem or if it even is a problem. For all I now this is how it’s supposed to work, as long as I move the post verticle and it floats there, am I allright?
For to Aft Balance
Since the XL1s is so front heavy, I moved the midplate back a bit and I had to add more counterweights to the botton. Right now I have 8 weights on the front of the base plate, and 10 weights on the back, with the back weights pushed back a bit towards to edge. With this setup, when floating, the camera stays perfectly verticle and doesn’t tilt forward or back. Although I am getting a little bit of what I described earlier with horizontal balance, where if I lightly tilt forward it stays in a lightly forward position. IF I lightly tilt backward, it stays in a backward position. Again, only by 5 degrees or so, so it’s almost verticle, but not quite. If I position it perfectly center, it stays there and floats.
The manual recommends only 6 counter weights in front and 6 in back. I found this to not be enough weight when doing a Sled Arc Test. Which leads me to…
Up and Down Balance (Sled Arc Test)
I had to use all the disks in order to get enough weight on the baseplate to drop. With all the weights on, it seems as if I have a perfect 3 second drop time. Basically I just lift up the baseplate to horizontal and let go and it takes a perfect 3 seconds for the base plate to return to verticle. So I hope I am all set there.
Do you guys think I am ready to roll? Just want to make sure if what I described is normal, or if I need to do some more adjusting. Also, for those with the V8 and who use the XL1s, what are your personal setups? Where have you mounted the camera, what weights are you using and where those weights are, what type of attachments you are using on the camera (system isolater, MA200, manual lens wireless etc…)
Those are all the questions I have for now and I’m sure I will have more. Thanks to anyone who can help with any of this.
I was able to construct the sled fine. Now, before I actually put on the rig, I just want to make sure that I have my horizontal and vertical balance set correctly, which I am doing using the balancing bracket on a C-stand as suggested. I don't want to start running around and practicing this thing until I know I have it balanced.
I am using a Canon XL1s. Now, I DO have a nice Nebtek LCD monitor, but I figured for now I just want to figure out how to balance the thing with the counterweight disks. Also, I stripped my XL1s of everything, so it's basically just the standard camera package, standard auto lens...no add ons for now. According to the Canon manual, the default package weighs 6 pounds. Therefore, I added three weight plates underneith the camera to make the recommended 9 pounds for my camera.
Left to Right Balance
Ok, so I start working on the horizontal balance. The XL1s is obviously very front heavy and a little left heavy. However, I think I have got the best results from mounting the camera onto the center of the plate, a little back instead of over to the right. Then by adjusting the mid plate with the allen wrench, I can slide the midplate over and back more to compensate for the camera. The only annoying thing about mounting it in the middle, is if you are using a quick release plate, you can’t remove the camera as the QR plate adjuster knob rests too close to the weight plates and can’t be turned. Kind of annoying as the quick release plate essentially then serves no purpose. As I'd have to take off the camera plate to remove the camera, I might as well just not even use the QR plate and just bolt the camera right onto the weight plates.
When mounted on the C stand, my horizontal balance is pretty good. However, it is hard to tell. The reason is it seems wherever I place the sled a tiny bit off the axis, it seems to float there. If I lighty touch the sled and tilt it a TINY BIT right, it will somewhat stay there. Which makes me think it’s too right heavy. However, if I lighty touch the sled and tilt it a tiny bit left, it pretty much stays there too, which makes me think it’s left heavy. Again, if I position the sled with my hand to make it perfectly verticle, it stays there and I think its balanced. I am confused a bit because the manual says that whenever you do a tilt or pan, the sled should always go back to perfect verticle when you release. Mine is sort of doing that, but not really. If I make a hard tilt to the right, yes…the camera starts to swing back to it’s verticle position, but the sled ends up with the top a little bit to the right, maybe 5 degrees or so. (Imagine the sled as a SLIGHT diagonal line going from bottom left to top right). Likewise, a hard tilt to the left will swing back to verticle, but end up a little bit to the left of verticle, 5 degrees. I hope I am making sense. So I am unsure how to correct this problem or if it even is a problem. For all I now this is how it’s supposed to work, as long as I move the post verticle and it floats there, am I allright?
For to Aft Balance
Since the XL1s is so front heavy, I moved the midplate back a bit and I had to add more counterweights to the botton. Right now I have 8 weights on the front of the base plate, and 10 weights on the back, with the back weights pushed back a bit towards to edge. With this setup, when floating, the camera stays perfectly verticle and doesn’t tilt forward or back. Although I am getting a little bit of what I described earlier with horizontal balance, where if I lightly tilt forward it stays in a lightly forward position. IF I lightly tilt backward, it stays in a backward position. Again, only by 5 degrees or so, so it’s almost verticle, but not quite. If I position it perfectly center, it stays there and floats.
The manual recommends only 6 counter weights in front and 6 in back. I found this to not be enough weight when doing a Sled Arc Test. Which leads me to…
Up and Down Balance (Sled Arc Test)
I had to use all the disks in order to get enough weight on the baseplate to drop. With all the weights on, it seems as if I have a perfect 3 second drop time. Basically I just lift up the baseplate to horizontal and let go and it takes a perfect 3 seconds for the base plate to return to verticle. So I hope I am all set there.
Do you guys think I am ready to roll? Just want to make sure if what I described is normal, or if I need to do some more adjusting. Also, for those with the V8 and who use the XL1s, what are your personal setups? Where have you mounted the camera, what weights are you using and where those weights are, what type of attachments you are using on the camera (system isolater, MA200, manual lens wireless etc…)
Those are all the questions I have for now and I’m sure I will have more. Thanks to anyone who can help with any of this.