Radian on a 3-axis cinestar gimbal, latest 1.03 firmware. Savox on pitch, FF servos on pan and roll. Camera balanced without belts on. We've had quite a bit of roll trouble with our Radian, most of which we've managed to address by addressing mechanical issues. Here's what we've done so far: We determined that the main pan wheel had worked itself a little loose, so the 3-axis was slightly looser than it would be only on isolators. We tightened every bolt, and that's no longer an issue. We swapped the red o-rings out with blue. We also found that the savox servo that we did have on the roll was allowing some play, and determined that some of the gears in the servo must be a bit worn. So we swapped that out with a new FF servo, which is much tighter and doesn't seem loose at all. Finally, we determined that the camera wasn't vertically balanced on the roll axis. It was balanced in the center, but wouldn't remain at any orientation when left there. We raised the camera to ensure that, belts-off, it will remain in any roll orientation. This has pretty much eliminated all of the high-frequency twitching that we had been experiencing, at least at gain levels that should be possible. We've gotten it up to 140 now, any higher than that and we begin to see some high-frequency jitters. Actually, in reviewing the following video I still see a little bit of oscillation, so it might still be too high. So whats the problem? It seems like the Radian is consistently slow to compensate for roll movement, especially with sudden direction changes. So if the heli is in any kind of wind that requires it to make rapid adjustments, we see a lot of under-compensation that manifests itself as a bit of a shake around the direction change. See the following video, from about 0:18 to 1:00 (we turned off the Radian @ 1:00). The Radian was running in non-slew mode, so no camera operator was involved. There was a fair amount of wind, probably between 10 and 15mph. Tilt and pan are pretty much perfect, it's just the roll that we're stumped on. It's almost there, but unfortunately it's so close that the smallest deviation really sticks out. We can probably eliminate this with stabilization in Final Cut, but it seems like we should be able to get it more locked in on the Radian. If I increase the gain to try to get the Radian more sensitive we start to get high frequency oscillations, but if we lower it the roll under-correction gets worse. Any thoughts would be greatly appreciated!