Orion XT12i with Swayze-refigured primary & Protostar secondary
Televue NP101 refractor
William Optics Megrez 90 refractor
Universal Astronomics Deluxe Mounts
Quote:Aluminum tubing is another possibility, but you might have to turn the OD down slightly to fit into a focuser. Online metals JimC
Jim Fly - Manufacturer
Quote:I appreciate the suggestions so far; I anticipated McMaster-Carr would likely have appropriate tubing.However, a key objective is to enable anyone shown instructions or an example on a given morning to go right out that very afternoon and quickly, easily, cheaply construct a passably usable sight tube for themselves, from readily available local materials. The sort of neophyte reflector owners who end up sticking with astronomy more ambitiously longer-term will probably end up at some point wanting to upgrade to better-quality, better-machined collimation tools such as the Catseye system, often not very long after they've upgraded their scopes to something more capable.Of course, once a suitable local pipe source is found, the other key component is some sort of compatible end-cap suitable to accurately drill a 2mm peephole through the center thereof. That's why it's frustrating that PVC pipe didn't (so far) work out as a solution; but-for the lack of proper-gauge sizing, it would have been perfect. Maybe the plumbing drainpipe idea will pan out...
AD10, NoName8, DS-16 with Spooner primary.
ES, Sterling, Parks, Baader, TV, GSO EP's and a lone Nagler.
Nikon, Celestron binos
Quote:What about 2" O.D. tube? I've had no luck finding anything that works.
Quote:1.25" OD (+/-.015")
Our Secret To Life:
Focus on what you have, not on what you don't;
Focus on what you can do, not on what you can't.
Coulter 8" dob w/Push-To finder system
Meade 8" EMC SCT/Celestron CG-5GT mount
GO Gemini 15x70 binoculars/parallelogram mount w/Push-To finder system
The Albuquerque Astronomy Society (TAAS)
Quote:The possible catch is that 35mm film cannisters, which only a few short years ago were ubiquitous, are rapidly going extinct as a commonly available item.
Quote:... The possible catch is that 35mm film cannisters, which only a few short years ago were ubiquitous, are rapidly going extinct as a commonly available item.