View Single Post
  #7  
Old 16-01-2020, 07:49 AM
The_bluester's Avatar
The_bluester (Paul)
Registered User

The_bluester is offline
 
Join Date: Feb 2011
Location: Kilmore, Australia
Posts: 3,342
I should post again, what I wrote sounds a little harsh. I seriously considered a RASA 8 for a long time but decided on the simplicity of a nice short focal length (But much slower) refractor.

Regards the attachment method to the front cell, I would suggest a wipe with a cloth of the mating surfaces any time the adapter is removed as any bit of dirt between the mating faces could introduce tilt that will be visible given the size of the critical focus zone at F2.

I would be interested to hear how stable they are focus wise with temperature changes, the traditional SCT is far less touchy to focus but the cassegrain setup magnifies the focus shift as the tube expands and contracts which I would think the RASA design avoids. So while it might be more difficult to get focus it possibly stays there a lot longer.
Reply With Quote