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hmm, the dreaded thermal expansion. thanks, will look at alternative materials.
The RC designs do look deceptively simple, but the weight of the Mirror section and the secondary area needs to be adjusted correctly for the balance point to be close to the mirror, as forks are sensitive to balancing errors. one upside is they require lighter counterweights.
Are CF truss tubes commercially available?
as for the mirror cell, I'll have a play around making one, but I might be taking on too much if I go down that route as I have all the rest to design and fabricate. I have had a look at plop.
Reason I brought this query up is because I may be able to get a 12" F4 mirror set from Orion optics for Christmas or as an alternative, from GSO as they're high on my wish list and that wish might just be granted!
As for the Serrurier designs, I understand the concept, but is sag really that noticeable if trusses are CF or are very stiff?
wouldn't axial sag on either sides of the pivot point be pronounced with cylindrical OTA's as well?
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