|
The problem of whether the mirror is under/over corrected is not which one is better but how much. Too much of either and youll have a soft image and a wider range of focusing at the EP instead of one definite position where the focus is crisp. I think a warm mirror is always overcorrected?? due to the mirror not being the correct shape.
For a comparison my Parks mirrors practically snap into focus whilst the the gs has a very small range of travel in the focuser where its acceptible. The gs is fractionally undercorrected but still gives me extremely satisfying views.
|