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Old 10-04-2019, 05:52 PM
Startrek (Martin)
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Startrek is offline
 
Join Date: Dec 2017
Location: Sydney and South Coast NSW
Posts: 5,990
My guide scope specs say you can use it for focal lengths up to 1500mm
My scope is 1000mm and has an image scale 5.4 times the guide scope image scale
At 1500mm focal length you would have an image scale 7.4 times the guide scope image scale
So the magical < 4x image scale is probably a figure in the “ideal world” I suppose
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