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Celestron 11" f/2.2 Rowe-Ackermann Schmidt Astrograph (RASA) optical tube
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10-07-2014, 07:12 AM
RickS
(Rick)
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Join Date: Apr 2010
Location: Brisbane
Posts: 10,584
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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