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Old 18-01-2020, 07:39 PM
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Wavytone is offline
Join Date: Jul 2008
Location: Killara, Sydney
Posts: 4,147
Carlton they can be good but don’t forget the OTA is open, unlike your mak. This make a huge difference to the longevity of the mirror coatings, for one thing, and the Rumak (yours and mine) have zero coma (when collimated) and flat fields.

And I’d be very surprised if GSO produced one that overall was 1/8 wave PV.
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