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Hi Dave,

First, many thanks for your nice comment about the NGC891. You need the coma corrector if you use either a DSLR or a large CCD chip for imaging as the coma free zone of the 200P is around 10mm . If you use a small chipped webcam for planetary it may not be necessary if the chip is the usual 1/4"~1/3" format.

Regards,

A.G

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