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Hello everyone, I am currently using 150/750 Newton Skywatcher telescope to experiment on some self made optical device designed to be mounted on its focusing tube. This optical prototype is quite heavy for the moment so I plan to use the threaded part of the focusing tube that becomes available once you unscrew the 50.8mm (2”) adapter. ( You can see what i am talking about on the attached pictures) I'd like to know the exact standard dimensions of this threaded part so I can make/buy the right adapter for it. Has anyone already used this threaded cylinder? Would anyone have some cad drawing of it? I don't have any caliper available for the following weeks, and the standard has a high probability to be imperial, which i'm not quite familiar with (i'm writing from Europe). I would be extremely thankful for your help! 4nt4res
Hi Guys New member, ancient ATMer. I have joined to directly access Pulsar dome owners' fund of information. I am building a raised platform 8' off the ground to provide a much bigger sky. Trees and hedges surround and interrupt our dark rural property. Our modest 1.5 story home is on the southern border of our large garden. Fortunately neighbours with security lights at a hundred yards south and SW are safely hidden by the house. Increasing age demands shelter from the almost constant wind. My two main OTAs are now much too heavy for easy lifting: I am using a chain hoist and nested stepladders! I have a 10" f/8 reflector with premium optics and a 7" f/12 R35 iStar refractor. [Presently folded.] Both ATM builds. My almost completed, massive DIY GEM has 2" shafts and lots of heavy aluminium. ie. Immovable! It is running AWR IH2/ASCOM drives to 11" and 8" Beacon hill wormwheels. The images show my mounting on a temporary test stand. Now the real reason for my unscheduled interruption: [Much as I like talking about myself.] I am torn between a DIY all aluminium, rotating "dome" of the cylindrical roof variety or buying a Pulsar 2.7m. dome only kit. Making a hemispherical dome is a long term exercise in geometrical and sealing frustration IMHO. The off-the-shelf Pulsar 2.7 is rather cramped for my 2 meter long Newtonian even when the dome is mounted on a much larger "box". Does any recent Pulsar 2.7m dome purchaser have the minimum internal dimensions between opposing quadrant ribs? I understand the 2.7m is actually 2.6 from Pulsar's own drawings but that may be external. With so little clearance available I really need an accurate figure. Thank you for your patience if you have reached this far. Regards, Rusted