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Old 13-02-2013, 10:36 AM
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alpal
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Join Date: Jan 2012
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Quote:
Originally Posted by Satchmo View Post
This was the first mention of Strehl ratio I saw in the review...

Remember that an instrument with a 50% obstruction will lose some 40% of its Strehl ratio due to the obstruction.
Hi Mark,
then why do people pay megabucks for obstructed RC telescopes with published high Strehl ratios?
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