I'm working off the same scene file on all cameras. I've got 2 cameras straight into the scope comparing, no splitters. Shutter is set at 47.2, a number we got early on that seems to be the best speed to limit strobing. I've compared different filter wheel settings. Everything so far is exactly the same. Any other ideas? By the way, why would you use PHALFSHUT on if you get a better stop with it off. We didn't see any strobing difference on or off. Thanks for all your suggestions so far. Craig