Yes - same optics times two. I think when the RC design ventures away from the more typical f8 or f9, plus a relatively small primary, the secondary size has to go up to keep a large well illuminated field (I don't claim to be an expert). The baffles have to be 'oversized' to prevent stray/off axis light etc. I guess the effective speed of the scope is reduced somewhat - I had 98% coatings done at Spectrum Coatings. I'll pass on a rough baffle diagram soon perhaps. Not a planetary scope - but I didn't want one of those. Makes the 16RC attractive - less obstruction - but my current budget didn't stretch so far. Meanwhile I'm imaging at F10 with my 12"SCT on the PME - the PME doesn't seem at all taxed. guy
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Re: My thread for building a 12.5" RC.
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