My gear: --Celestron 8EdgeHD & 11EdgeHD | 80mm F/6 Triplet | Modified Canon T1i | QSI683WSG-8 | Celestron AVX mount | iOptron CEM60 mount | iOptron ZEQ25 mount --- My skies:
NSN Channel: BigAppleSkies
CPC 1100 with HD Pro Wedge with ETX-70 Finder Celestar C8, C80ED and PST Istar 150 Anistigmatic R30 on CGEM Jason 313 from 1975! Mallincam Extreme & Mallincam SSIc & Mallincam Micro DSI Pro, Orion SSAG, GPUSB, Nautilus Filterwheel JMI, Celestron and Orion MotoFocus, FCUSB1&2 Hyperion 5,13, ES 18, 30, OR 18, 25 TV 2.5x Powermate, WO Binoviewer with pairs: TV 7 Naglers, WO 20 and RKE 28
G11/Gemini-2/OPWB Canon 60D (unmodified) with 18/55mm kit lens and "nifty fifty" lens Assorted M42 screw mount lenses (28mm thru 300mm) Celestron 102GT refractor (Costco special) 8/10 inch astrograph someday. DeepSkyStacker 3.3.2 StarTools 1.3 http://www.astrobin.com/users/StarGale/ http://everettastro.org/
Scopes: 12.5" Dob w/Lightholder mirror, Astro Tech AT8RC, TPO 8" Imaging Newt, Intes MK-67 Deluxe, Tak FS-60CB, Tasco 10TE, Coronado PST
My images: http://mtanous.wordpress.com
Quote:...I've found that the error reported by ASPA or Alignmaster is not very accurate, ...
David-------David Lukehurst UP 20" f/4, Orion Optics ODK12, CFF 180, Borg 125SD, Wiliam Optics FLT98, Borg 71FL, TS 50EDLunt LS60THa + LS60FHa
Quote:Instead of measuring the alignment error in arcmin, why not just measure the drift in arcsec over the longest length of subexposures you plan on taking? When you get to the point where you either reach 0 arcsec or diminishing returns you are done.Gale
Rural central lower Michigan
Quote:I think you guys misunderstood his question. He isn't asking if ASPA report is accurate. He is testing the result of ASPA against a 3rd party program that shows in arcminutes or arcseconds what the drift is. After doing an ASPA it appears that pempros polar alignment helper is telling him that it is under 2 arcminutes. If that is true, that is really good I think. Also to answer the OP's second question, if I was setting up a mount in an observatory I would want to get it under an arcminute and then I would try to see if I could get t lower just because I won't ever touch it again but I think anything under 1 arcminute is excellent.
Quote:fuss with it until you can get it as close to 0 as humanly possible however I am not sure if any mounts are capable of such fine adjustment to get it that perfect.
Televue 85/TRF-2008 field flattener, Meade LX200 10", Manfrotto 055SSB tripod/410 geared head/AstroTrac TT320X-AG/056 3D head, GM-8/Gemini, 10 Micron 1000 HPS, Canon 40D (unmodded), Canon 450D (modded w/Astronomiks clip-ins - UV/IR, OWB), Coronado SM60/Lunt B1200/WO diagonal, Baader Herschel Wedge Leeds Sky Clock Ripon Sky Clock
Quote: My 10Micron GM1000HPS is currently measuring 15 arc seconds error from polar alignment. That was achieved with 3 iterations of its built in Polar Alignment procedure using 15 alignment stars. I tried the procedure out 6 times now with results ranging from 25 arc seconds error to the best around 12 arc seconds error.
Others may disagree. Your millage may vary. Void where prohibited by law.
Everything depends on mind.
LS60THa/B1200 Cerevolo 8" F5 MN Orion 11 SCT Tak EM200, Meade 6" F5 Newt, Starblast 4.5", ETX 90 C6 SCT, Meade 90 mm F9 refractor Meade 10"SN Canon T3, Mallincam Extreme
Adam AP Mach 1, Rob Miller TRI36L, Celestron 8" Edge HD Hyperion 17mm, Celestron 40mm Plossl, TMB 7mm & 9mm WO 66, Lunt LS60/B1200 PT, CG-5 Clone STF-8300m Pro Package, Honis-Modified Canon XS, Un-modded T1i, SSAG, TSOAG9, SX LodestarLackawanna Astronomical SocietyMy Astrobin