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Old 30-01-2010, 09:40 AM
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multiweb (Marc)
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Join Date: Oct 2007
Location: Hinchinbrook
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Originally Posted by Paul Haese View Post
Jason, while the above I agree with there is some evidence from my own experience that suggests guiding with a focal length under half of your primary can lead to pronounced flexure issues.
I understand OAG is the way to go when flexure is involved (ie. large SCT) but how does keeping the guider and imager FL closer resolves this or makes it better? Whether you guide an 11" SCT imaging let's say at f/6.5 with an 8x50 guider or en ED80 is not going to make much difference in your final pic? Flexure is a separate issue with focuser sag in refractor or mirror flop in SCT or other bracing moving over time in respect to the guider, or even the guider too heavy moving in respect to the main scope.
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