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I have not used neither of the two, but for photography I would keep the triplet because in theory it will have better colour correction than the doublet. Another aspect is telescope's speed, f/7 being faster than f/8, plus a 0.8 reducer would turn your triplet into f/5.6 which is very nice for astrophotography. Such reducer will not work as well with a doublet and halos would be even larger in a dublet with a reducer.
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