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Hi Bob
Sorry for the confusion as the thread evolved and indeed I originally thought of the skywatcher 102 achro F10 refractor. Subsequently, another post highlighted the existence of an even better 102 F13 refractor made by Bresser which I didn't previously knew existed.
You raise a good point about a diagonal which I could also supply if needed. You raise another good point which is I have no idea as to the quality of the Bresser telescope other than the spec's.
The majority of opinions on the other thread seem to support the Dob whereas here a refractor seems to be the preference. That is, the underlying principle that aperture wins in the other thread seems to be refuted here and the smaller refractor beats the big aperture dob
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