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Hi NeilW,
The Radian series ranges from 3 to 18mm and has a 60 degree field. They are designed particularly for planetary observers. The Panoptics range from 41 to 19mm, and have a 68 degree field, so are designed more for wide field views. The two ranges do not overlap, so it depends on what type of observing you plan to do. Both ranges are first rate.
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