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Hi Col,
As Don Pensack mentioned the scope will be limited to about 150X to 160X because of its aperture. This is about 50X per inch of aperture.
From memory you already own a 12.5mm Docter? If so, you don't need anything else around this focal length. It's about the best eyepiece money can be at any focal length. You already have the longer focal lengths covered from 30mm to 42mm. What other eyepieces with a focal length < 30mm, besides the Docter, do you already have?
Cheers,
John B
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