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Old 13-02-2018, 08:28 PM
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Merlin66 (Ken)
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Merlin66 is offline
 
Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,927
Hmmm
Adding optics to the set-up can change the effective focal length....
Reducers and Barlows all have an impact.
Easiest solution is to use a blind solve in Astrometry.net - this will establish the focal length etc.
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