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Hi Dennis,
when imaging people tend to talk more about focal length than magnification, if your scope has a focal length of 1500mm for example and you used a 2x barlow, your focal length then becomes 3000mm.
so a 12" f/5 scope with a 5x powermate would be somewhere around the 7.5m range.
once you add a filter wheel and other bits n pieces it gets a bit harder to work out but i think there are programs that help you work out exactly what focal length your imaging at.
cant really help you with the other questions, im sure someone else will jump in though
Cheers,
Tj
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