|
It depends where the filter is placed.
I have a filter in between my flattener and camera at the moment and it made a small difference to the focus point, and the images suggest that my corrector to camera distance is no longer quite correct.
I did a similar thing a year ago with a borrowed scope, that one had a filter thread in front of the corrector (between the corrector and the objective) and all that required was a slight change to the focuser position to achieve focus.
|