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#1 Daniel Abboud

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Posted 20 February 2008 - 03:27 PM

Has Anyone out there ever used a Movie Tube on their rig? I just finished a pilot where it was the second time I've used the Tube. Each time, I've discovered a quaking motion that appears in the odd take and I don't know why.

Does anyone have any insights on this?

Thanks!
-Dan.

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#2 Richard James Lewis

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Posted 20 February 2008 - 04:21 PM

Dan,

I had a promo with the Movietube last week for the first time, on the first day while setting up; I noticed some vibration in the image. I realised that it was coming from my Sony plate not fitting snugly, which is not unusual.
I'd normally use my hard clamping, screw on alternative to the Sony plate, but the Movietube doesn't have the traditional 1/4", or 3/8? screw hole under the "V snap" area, so I couldn?t attach it. We cable tied it down and continued away with no further issues.
I mentioned it to the rental company after wrap, and attached the Sony plate that came with the kit to demonstrate the issue. To my surprise, no vibration. The long and short of it... The Movietube can be very picky Sony plate wise, something about the back end catch being machined slightly closer than it should be.
Try a different plate until you get one that fits better...
Probably why you didn?t notice this problem last time..

Hope this helps,

Rick


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#3 Lukas Franz

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Posted 21 February 2008 - 03:33 PM

Daniel,

I've some experience with movietube and other 35mm adaptors like P+S, etc. And the vibration could be due to the hard mount of the camera (especially on movietube) or the lens mount. I had a similar problem with a P+S and a PL-mount which where the lens had some little play. On steadicam walking real fast on street a visible vibration was the result. I haven't found a good solution yet (only to check it with the all used lenses before the shoot and change the adaptor or lens in case of bad test results). On movietube I've locked the camera with some gaffer tape on the adaptor. Just around the video lens and the achromatic lens.

Shooting with an adaptor is always a bad mechanical combination, cause you have too many moveable lenses and too bad connections in-between.

Lukas

Edited by Lukas Franz, 21 February 2008 - 03:34 PM.

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#4 David Hughes

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Posted 21 February 2008 - 04:52 PM

Hi Daniel.
I have shot many projects with a Movietube over the past few years and yes the sony mounting is total shite on the MT however there could be many causes for movement as this setup is way too complex and as Lucas pionted out far to many potential sources for mis-alignment and vibration chaos. The last shoot I did with it was worse than I had ever seen the the whole camera docking alignment mechanism and HVX was bouncing around like crazy which restricted me to only gentle moves. It was because the rental house hadn't tightened some of grub screws that hold the bars in place where the docking bridge setup mounts to the main body. We managed to help it a bit by putting cable ties around the handle of the HVX and tensioning them around the bars at the front but it wasn't an ideal fix. Post-mortem with the owner revealed a few loose grub screws that need to be kept tight and had worked them selves loose.
If I ever use one again I will be out with my allen keys and checking all of these screws on the bottom of the main body are tight, I would use the cable ties as well for extra security.
Dodgy rental houses and poor maintenance aside I believe it will always be a bit on the flaky side vibration wise simply because of the complexity of the mechanism, but it can make some great pictures with the right set up.
Dave.

Edited by David Hughes, 21 February 2008 - 04:54 PM.

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#5 Mitch Gross

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Posted 22 February 2008 - 09:39 AM

The various grub screws and other lock points should be checked and it doesn't hurt to strap the camera down when making fast moves. We've successfully used the MOVIEtube handheld and on 3-axis remote jibs along with Steadicam with no movement issues. I also highly reccomend the new Arri Digi-cine V-lock plates to hol MOVIEtubes or any other camera very, very securely. Yes they are heavier than standard plates, but they are also incredibly robust and their adjustability makes the grip on the camera rock solid.
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#6 Daniel Abboud

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Posted 23 February 2008 - 09:46 PM

Hi Guys!! Thanks for the ideas!!
-Dan.

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