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
Astro-physics, Canon, Pentax, QSI, Rob Miller, Stellarvue, Takahashi, TEC, William Optics (Time to thin the herd) My astrophotos at http://www.flickr.com/photos/r...s/72157627136712042/
Quote:Nice, but just how many people have access to a "discarded secondary from an old SCT" ?
Quote:I have one of the artificial stars and they are very good. But the issue I find is getting sufficient distance to get the infinity focus on the scope.
Quote:One question: Does it matter how accurate the figure on the convex mirror is? For collimation? For star testing?
Quote:Nice, but just how many people have access to a "discarded secondary from an old SCT" ?I have one of the artificial stars and they are very good. But the issue I find is getting sufficient distance to get the infinity focus on the scope.
Friends call me Duane. Compustar C14, Leo Henzl's Custom C8, 6" Refractor Adv. GT mount, 6" F5 Omni XLT Newt., LXD-75 F4 Imaging SN8, Meade 8" F6 Newtonian, EX Dynamax DX6, RV-6 ETX-90 Astro, Meade 2045 4" SCT, B&L 4000 Vixen/Celestron 80mm F11 JC Penny 60mm AZ/ALT Refractor Binos 25x100
Look’d up in perfect silence at the stars
Quote:The out-of-focus figures in the article seem to show astigmatism. But the author reports excellent optical performance. Did the stig come from the accessory mirror or its mounting?
Modded C9.25, Vixen SP retrofitted with DS motors and Autostar My pics
Stars light the world without, to give us purpose
They light us within to give us reason
We live in a well-lit abyss.
Quote:Something to consider. Rather collimate before doing any starwatching and do it inside before taking the telescope out. Collimating eats up precious starwatching time.