Quote:My lightweight short-tube 80 made with plastic bottlesWeight is 1.2 pounds.Objective is bought online, eyepiece taken from junk binoculars.
Astro-Physics 130 GT Half Hitch Nova 5mm Tak LE 18mm Tak LE 27mm Pan
That is pretty cool.
celestron c90 (the newer version) , homemade st80 , homemade alt-az mount
Quote:Quote:That is pretty cool.Lego blocks??? Yes, there are 6 lego pieces that I use to nail the lens cell into the tube body.I designed it to be detachable easily if I need to access the tube internal and baffles.
Quote:That is pretty cool.Lego blocks???
Antares 12" Dob Stellarvue 10*60 finder Telrad Meade 25mm Plossl, Orion 10mm plossl, Celestron 6mm plossl, Paradigm 18mm,15mm,12mm, 8mm, Knight Owl 20mm, Shorty 2x barlow, Celeston Ultima 2x Catseye Triple Pack Collimation 4.5" Tasco 11TR Frankenscope 60mm Tasco 9TE-5 60mm Tasco 7T Oberwerk 12*60 binos
Quote:Paint (unless you're talking about black radiator paint) is an insulator. I'd be interested in a comparison test of painted versus unpainted vanes to see just which version would produce the hypothesized results.-Tim.
Quote: so I translated the summary of Couder's article that looks into spider vane thermal emissions (see attached). It is an interesting document which the english only speaking amateur astronomy community does not have access to.
-DannyMy warehouseMy Channel
Quote: [ is there any versions on line?
Vaughn :-) Observing from Dunedin, New Zealand. (45ºS) [100mm f/15 Refractor] [200mm f/13 Newtonian - under construction!]
C10NGT, Z8, 150 Rumak, XLT 150, C6, C5, SW5 Newt, 4.5 Ball, C102GT, C90, ST80, A70LF; 15x70, 25x100; Burgess BV; Paracorr II; T6 2.5, XO 2.58/5.1, Ethos-SX 3.7, Delos 4.5, TV Plossl 7.4-26, BCO 10, Hutech HC 12.5, Sterling 12.5-25, ES100 14, CZJ H 16/25, CZJ O 16, M5k UWA 24, T5 31, Ultrascopic 35, Titan-II 40; Bino Pairs M5k UWA 6.7, Baader Zoom 8-24, M5k SWA 24, TV Plossl 26, RKE 28.7; Zooms NZ 2-4, NZ 3-6, Leica ASPH 8.9-17.8, Baader 8-24; Baader Zoom Barlow, VIP Barlow
Quote:4" f/12 Istar, powder coated, baffled, AP focuser.Jim
Selfmade 83x914mm w "Jaegers" Achromat Selfmade 127x700mm w "Surplus Shed" Achromat Orion XT8 Selfmade SiTech ALT AZ Celestron Advanced VX
7x35 and 10x50 sears tower binocs, 3" f/10 edmunds reflector, 2.4" f/11.7 manon refractor, 6" f/8 jaegers refractor, 10" f/11 R30 Istar refractor, 3" f/15.8 sans&streiffe refractor, 3.1" f/15 selsi refractor(towa 339), 2.4" f/15 sears refractor, selsi 30x30mm spyglass, criterion 5-draw 25x45x75x spyglass(1957), 4.25" f/14.8 tasco 20te.http://cleardarksky.com/c/OmahaNEkey.html
Quote:Surplus Shed 127mm x700mm F5.5 Achromat mounted in marine diesel air intake tubing w homemade heater strips and modified reflector focuser
12" ScopeScavenger Truss Prototype 1.0 http://scopescavengerastronomy.blogspot.com ETX90 with goto--currenltly on loan to an aspiring young astronomer Z12 Zhumell Dob with setting circles and digital inclinometer--currently dissected for parts EPs (Agena 24-8mm zoom, 30mm 2" zhumell, 28mm super plossl, Celestron basic kit 15mm and 9mm) 10x42 Alpen binos 20x80 binos
Quote:Originally, It was a Rustoleum Metallic Orange that I tried real hard to make work because it looked so nice. But I've given up. The stuff just stayed soft even after weeks of drying so I have ordered a CF looking vinyl wrap.
Quote:I have the 900mm verion of that lens from the same supplier. But I did not just make the OTA from 4" ABS fittings, it also includes the rest of the equatorial mount. Consider it a Springfield like refractor with a fixed eyepiece position. It does require using 2 elliptical diagonals. Sitting down and observing is a treat. I use a laser to "line up" the objects I want to observe. But often I just start somewhere and pan around. The upper end of the OTA is screwed into the first T fitting. This allows other focal length lenses with their customized upper tube to be screwed into place and thus observe with different objectives, both different in focal ratio or smaller (127 mm) is the max practical objective aperture. So you can use ABS, don't know about PVC, for these objectives. Norm
"The White Zone is for loading or unloading of passengers only. No Astrophotography." Cosmic Acres! Greatest restoration challenge: Tulley and Sons 3" achromat on Altazimuth mount, circa ~late 1820s
My builds 200mm f/6 250mm f/5 binoviewer optimized 400mm f/4.5 in progress
Keep looking up !!
"Imagination is more important than knowledge" - Einstein