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Question for John Bambury (Ausastronomer)
John - you mentioned the German 12.5 Docter previously - I hope this is a simple question - is it worth getting one given the price?
For example - if you already have a 13mm Ethos, 14mmXW and 12.5XF is it worth getting one? or more to the point - what can the Docter do which the others can't?
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