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Hi thefrogulox I would suggest a Baader 8mm-24mm click stop zoom.This item is not too expensive and provides 8mm,12mm,16mm,20mm as well as 24mm focal length. It functions particularly well at 16mm down to 8mm (having 70degree field at 8mm).Reviews are excellent and it compares well with premium fixed focal eyepieced particularly at the shorter focal length end.
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