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Plossls are generally about 50 degrees in apparent field of view. (Superwides are 70 degrees, Naglers and ultrawides are 80-82 degrees. Orthoscopics less than 40 degrees.)
The shorter the focal length of your eyepiece, the higher the magnification.
9-10 mm is a good focal length eyepiece for a 1200 mm scope. If you get a 2x barlow lens, you effectively have magnifications of 30x (40mm EP), 60x (40mm with barlow), 120x (10mm EP), and 240x (10mm EP with barlow, probably seldom used).
Cheers,
Brian.
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