Thread: ED80 vs ED100 for astrophotography?
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Old 07-10-2008, 01:18 PM
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[1ponders] (Paul)
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The ED100 also has a slower f/ratio (f/9? compared to f/7.5) so you would need to increase your imaging time by 1.44 to achieve the same level of exposure. Also the longer your FL the more demanding on your autoguiding.
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