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Homa
journeyman
Reged: 06/21/08
Posts: 73
Loc: Germany,by Hamburg
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Re: This third Mount will be the Last
07/17/08 06:15 PM Attachment (67 downloads)
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Hi,
i think two bearing pairs to sitting by 2x tapered bearings D150/d85/H31 are enough.
joseph fraunhofer had take for the struve mount(Dorpat) too
~95 mm steel shaft and only gliding bearings.
okay, the repsold mount of kufner observatory(vienna)is perfects 
i am not the mechanical master 
perhaps the long telescope-tube it is heavy  ,but under f 20 the false color will be greater 
i am not like to buy a chroma corrector 
perhaps are 8"f18 or 10"f18 or 11"f 25 (folded) enough 
i believe that the axis in steel will be not breaking  and the bearing can to change
regards Marc
--------------------
i very like historic refractors
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