|
Sounds like it's the mirror cell causing the primary to go out of figure. The primary maybe loose, but the clips that keep it in the cell must be pressing against it in such a fashion as to cause the astigmatism. They don't have to press really hard to make the mirror twist out of shape. If it were the primary mirror causing the astigmatism, when you rotated it, the astigmatism would change direction in the new orientation of the mirror. Since it didn't, then the cause must be something else. What gave it away was when you moved both the cell and the mirror....the orientation of the astigmatism changed then, so it must be the cell causing it. I'd suggest you modify the cell so the clips don't press down on the mirror at all. Maybe even replace the cell.
|