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Thanks Mike. I will be using an STL-11000M (the same one I am currently using with my 200mm Newtonian) with an Optec TCF-S3. Far larger and more solid than my current 2" Moonlite - it is a crayford design and I believe is tensioned to 500lb pressure. The focuser will be attached to an adapter plate via a circular dovetail and 6 set screws, and the adpater plate will be shimmed and bolted to the flat focuser platform (seen in earler post image of the tube) at three points on a diameter of about 150mm, so should be rock solid.
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Sounds like you have it covered and I saw the raised section on your Dream tube too, nice idea, I think the thicker core of the Dream tubes means this should be adequate to stop tube flex with a heavy camera and filterwheel..?
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The ID of the tube is approx 370mm.
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That's what I thought the AG12 tube is 350mm but it's a 12" not 12.5" I guess.
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The primary is f/5, and using Mel Bartel's diagonal calculator with my optical configuration gives a 100% illuminated field on a 30mm diameter field, dropping slightly to 94% in the extreme corners of the STL chip. From memory I believe the 3" Keller corrector that I have has similar vignetting so the diagonal size is really quite optimal.
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Ok fair enough, F5 is a tighter cone than F3.8 of course
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Have you taken delivery of your (modified) Orion Optics AG12 yet? I assume that part of the modification is to incorporate a raised platform for the FLI focuser (due to the backfocus required by the Wynne design corrector)?
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Delivery is still waiting on the Atlas focuser to be built and sent to the UK
My AG12 will have the complete tube ring brace option fitted as per the attached photo, this is a similar solution to
Wolfgang Prompers ASA 12 . I am also having a custom CF light/dew shield made that rigidly attaches (to hold a light box if required) but is removable, integrated secondary and tube heaters controlled via a rear mounted controller and Ultra grade optics upgrade (just cause
).