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Hi Stephen, well done with your Saturn attempt, especially with a 6" scope, but be warned, imaging Saturn can be addictive.
The best way to check what F/L and thus F/R you are imaging at is to measure your final image using the "F/L From Plate Scale" formula that is posted either in the IIS Resources section or IIS Projects & Articles section. It was posted there by Anthony Wesley.
The 5x PM out of the box works at a lot more than 5x, it depends on the distance from the top surface of the PM's eyepiece barrel to the chip in your camera. The greater the distance the higher the mag.
Regards
Trevor
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