23 Dec
2006
23 Dec
'06
3:24 p.m.
Yep, a check of the Protostar Website shows that the curved option is only for "tubes" up to 15". IIRC, the reason was unacceptable vibration when you go larger due to more massive secondaries. Thickening the spider 'vane' sections to compensate cancelled the diffraction-fighting quality of the curved supports.
I don't think Protostar offers a curved option for large spiders, however. I'll check into it as time permits.
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