RED Drive and Gyros
Posted 14 July 2008 - 01:46 PM
We continued on CF cards. Everything was fine, except from the fact that we had gone RED on this shoot precisely so we wouldn?t have to reload every four and a half minutes, which now we had to do. We had five CF cards with us. Constant reloading and downloading (an all-steadicam shoot) on the boat was not fun, but there was no way I was going to compromise the shots by not using gyros. (I contemplated switching to the AR, but I would be at least 20 minutes away from being ready, and it wouldn?t be much help against the left-right play from the wind anyway. I needed added inertia and rigidity on the pan axis, not level correction.)
I was wondering if anyone of you guys did run into a similar issue with gyros and the RED Drive, or if there is someone who had no problems at all and there is something on my part I should be looking into. I was reading in reduser that there were a few hiccups here and there (to put it mildly) with gyro-assisted aerial systems. Element Technica is coming out soon with a ?shock-isolated? mount for the Drive, so perhaps there is an imminent solution in the horizon, apart from higher capacity CF cards and the Flash Drive getting cheaper.
Incidentally, my hard-disc on-board recorder (an FFV NDT-200) never misses a beat (or bit), despite sitting almost on top of the gyros, but of course the demands from the two drives are a world apart.
Posted 15 July 2008 - 12:20 AM
Posted 15 July 2008 - 03:13 AM
I let you know what happened.
Posted 15 July 2008 - 02:27 PM
Posted 21 July 2008 - 02:52 PM
"At Pictorvision we have RED #970 as one of our in-house camera payloads for our Wescam gimbals and our new Eclipse stabilized aerial gimbal. The Wescam is a mass gyro system (inertia from three 2.5 lb 25,000 RPM brass weights stabilize the camera) and the Eclipse is actively stabilized by a high bandwidth servo loop. While both systems create visually stable images their camera payloads are subjected to considerable high frequency vibrations.
We have tried using the RED RAID to get longer runtimes so the helicopter doesn?t have to land every 4½ minutes but even during bench testing, consistently suffer dropped frames on both types of gimbals. We recently tested Element Technica's isolated drive mount on both the Eclipse and the Wescam and were unable to make either configurations drop a single frame. Regardless of what we subjected either gimbal to, the ET drive mount kept the RED RAID humming along. We even de-tuned the Eclipse to the point that it was resonating violently and still no dropped frames."
Posted 21 July 2008 - 03:19 PM
Posted 21 July 2008 - 08:18 PM
Posted 21 July 2008 - 09:06 PM
I'm curious to know what effect the mount might have in a Steadicam application. It would depend on the properties of the rubber in the mount that is used to absorb the shock. We're always trying to do what we can to make everything on our sleds and cameras as stiff as possible. Could a rubber mount create some high frequency bounce or wiggle?
I've seen that mount and the rubber is fairly stiff. Don't think it would effect the rig at all.