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I use the SXV-H9 as my guide camera which has a 9mm X 6.7mm chip and its sensitivity is good enough to clearly show a guide star in no more than a 2sec guide exposure every time at 1200mm FL through my 80ED guide scope,
Mike[/QUOTE]
How do you get 1200mm focal length with an ED80 - do you use a 2X barlow?
Greg.
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