Darren in Bakersfield
http://www.astrobin.com/users/KaiYang/ AT65EDQ + iEQ30 + CanonT3i(mod by Gary Honis) + CLS
Quote:I got one to test, it's nice and solid but it has one fundamental design problem. No Azimuth control.
SCOPES: CPC1100; AT66ED; EdgeHD 8";SVR90 RAPTOR MOUNTS: CGEM; Vixen GP2; iOptron Sky Tracker; Celestron AVX CAMERAS: Canon 60D;Lodestar EYEPIECES:31T5;D14;D8;P20;P25;P32;TMB9 The Lord sits enthroned above the circle of the earth...He stretched out the heavens like a canopy.
Far out in the uncharted backwaters of the unfashionable end of the Western Spiral Arm
Greenfield, Indiana USA
Deforked 1979 Orange C8, WO 66mm APO, 80mm f/7 refractor, Sears 60mm refractor, 80mm Orion short tube
Meade LX80 IOptron zEQ25
What was your process for capturing your PE curves? What software did you use, etc? I'd like to measure mine.
Quote:I would also like to know your method for measuring the tracking error.
Quote:Hello,I have got several nice photos with SkyTracker/Canon T3i /50mm. When I try on the 200mm lens, I found my cheapy tripod is just too weak to hold the system steadyAny suggested tripods which are in the reasonable price range (~$100) ?Thanks. -Kai
David Cotterell Toronto, Ontario "If an observer actually sees an object, there is no point in referring to a formula to find out whether he ought to see it; and if he fails to detect it, no formula will ensure his success." - W.H. Steavenson 8" f/15.5 TEC Maksutov 16" f/5 Teeter/Zambuto Dob 66mm WO SD AT 65EDQ APO Refractor Astro-Physics Mach 1 GTO Mount iOptron ZEQ25 mount Canon 60Da
Quote:I've tested the Polarie and the SkyTracker on an artificial star and I have not so bad results.
Quote:I'd like to revive this thread and talk about the Periodic Error of my Sky Tracker. See photo below with a 105mm lens on a 60Da, with the Sky Tracker purposely mis-aligned by 30 degrees or so, drive engaged and 25 minute exposure. The P.E. is easily seen in this full frame pic where the field of view is 12deg x 8deg. My pics with the 105mm lens at 2 minutes ALL show the P.E. as elongated stars. If you can see the P.E. in this picture it will manifest itself as an equal amplitude elongation of stars when the unit is properly polar aligned....Am I expecting too much? With a 105mm lens am I limited to 30 second or less subs?I would like to do 2-minute subs with a 105mm lens... I doubt I would try any longer lens.N.B. With a wide lens, 18mm, I shot a 10 minute pic and there was no evidence of star elongation - which stands to reason at that image scale. But is the Sky Tracker only suited to wide fields?Dave
Quote:one shot of the milkyway(approx,200sec.)using a Sigma 10-20mm lens.Sky was a bit hazy due to thunderstorms.Used photoshop to bring out contrast,colors etc.Fun piece of equipment
Newton 200/800, 200/1200, 400/1800 Sky-Watcher ED80 + mount G42+ PENTAX 75 SDHF, TEC 140-2011 Mount Celestron CGE Meade LX200R 8" OTA EOS 40Da, EOS 1100D, SBIG ST-402ME SBIG ST-4000XCM,SBIG ST-2000XM Spectrograph SBIG DSS-7, LHIRES III http://astroview.psionfired.com