Chuck, have you ever noticed something strange with the diopter?
Yeah....The diopter adjustment under the right eyepiece moves more freely than most do. That's nice when adjusting but bad when you want it to stay "set." The adjustment does tend to "wander" a little bit. It's nothing major but somewhat of an annoyance. It's easy to mark where it should be for easy adjustment return.
Trinovid HD is to the left...