We always thought that the video of ITMY is worse than ITMX but we were not sure about the camera/lens setting.

Richard opened the iris of both ITMX and ITMY gige camera all the way on Tuesday, and they still look the same. In the attached, several pictures with different exposures are combined, but even without doing anything ITMY looks obviously brighter.

Is there any hidden variable here?

(Added later: Non-conclusion of this alog is, it seems as if ITMY HR has larger scattering than ITMX HR, and that ITMX HR doesn't seem to have a  single big scatterer, but I'm still wondering if this is due to some hidden setting somewhere.)