Thread: Celestron 11" f/2.2 Rowe-Ackermann Schmidt Astrograph (RASA) optical tube
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Old 10-07-2014, 07:12 AM
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RickS (Rick)
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The f/2.2 light cone is very steep. The front corrector would need to be larger and more expensive at longer back focus and it would cause a greater obstruction.

Cheers,
Rick.
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