Quote:
Originally Posted by Slawomir
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Quote:
Originally Posted by glend
Greg i believe carbon tubes for refractors is just a design fad and not justified. It also makes heating an objective, to prevent condensation, more difficult.
I agree there are many excellent choices in your size range and going for the best published specs, rather than buying for a name, makes sense. Most APOs in that size range have pretty good imaging circles with flattened or reducer/corrector. I consider corrector mandatory as they increase speed. If your worries about lost of some focal length with a corrector, just buy the next size up imho.
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Thanks Glen.
I agree it seems more of a marketing thing. Stellarvue to be honest though are quite clear on their site that aluminium tubes have several advantages over carbon fibre.
Having a good flattener or reducer is another important consideration although these days you can get a nice Riccardi reducer for about $550.
Looking at the Stellarvue site this seems pretty hard to beat in an aluminium tube (nice pearl type paint job as well):
http://www.stellarvue.com/stellarvue...tor-telescope/
Guaranteed better than .95 strehl. Boy scopes have come a long way over the years. That was only Takahashi, AP, TEC and some APMs before.
Greg.