Thread: Ritchey Chretien's and image curvature.
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Old 11-07-2009, 06:19 PM
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Tandum (Robin)
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Join Date: Apr 2008
Location: Wynnum West, Brisbane.
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Pete,
I found a page on Proper Positioning of a Focal Reducer
on a Ritchey-Chrétien Cassegrain Telescope which may come in handy.
Get the calculator out
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