Celestron EDGE 11/CGEM | Stellarvue SVR90T-25FT20MM ES100 | Televue 31MM Nagler T5 | Televue 11mm Nagler T6 | Televue 2X PowerMate Sky Safari 4 | SkyFi
Quote:Precise collimation is only possible when seeing is very good to excellent.
Money can't buy happiness, but it sure makes living with misery a lot easier!
Joined June 2012: Location, Ottawa, Ontario
Mes télescopes et jumelles:
150mm F5 Newt on EQ5, 127mm Mak Cass on AZ4
Oberwerk BT70-45 and 15X70 SkyMasters
Quote:That's terrific...unless you don't own a video camera. David
"A telescope is either good or cheap, not both" - but sometimes you get lucky!
C14 EdgeHD, C11 EdgeHD Zhumell 8" f/6 Newt AP1200GTO, CGEM DX, CG5-ASGT Rob Miller Tri36M tripod Canon Rebel XS, Atik 314L+, DSI pro I,II, QHY5L-II SX 7 FW with Astrodon LRGB, Ha 5nm Hutech OAG5, Rainbow Optics Grating Scorpio Observatory
Quote:To check the collimation of your telescope you will need a light source. A bright star near the zenith is ideal since there is a minimal amount of atmospheric distortion.
Quote:If seeing (i.e., air steadiness) is turbulent, collimation is difficult to judge. Wait until a better night if it is turbulent or aim to a steadier part of the sky. A steadier part of the sky is judged by steady versus twinkling stars.
"A craftsman relies on science when knowledge allows it, tradition and experience when it does not, and makes art whenever he can." 14 built scopes from 4.25 to 18" and a 24" in (perpetual) progress. 15 ATM awards. Co-mounted CPC 1100 EdgeHD/TAK FS-102/Orion ED80T on a trash-cart for when I'm feeling lazy. "Simple minds discuss people. Good minds discuss events. Great minds discuss telescopes." http://stardazed.com/
Quote:Quote: This is simply not true when you use modern methods based on hardware and software. MetaGuide has allowed collimation based on the Airy pattern in mediocre seeing for many years. Times change and techniques change.Frank Another plug, free advertising, from Frank..You can also use a Hotech Advanced Laser Collimator. And you don't even need a star..
Quote: This is simply not true when you use modern methods based on hardware and software. MetaGuide has allowed collimation based on the Airy pattern in mediocre seeing for many years. Times change and techniques change.Frank
Quote:If the seeing is no good, and it never really is...
150mm MCT f/13, 31% CO
"People say I'm in denial. I disagree."
Quote:I have also seen collimation degrade awfully between horizontal/artificial star and pointed up at 60 degrees.
Quote: Quote:I have also seen collimation degrade awfully between horizontal/artificial star and pointed up at 60 degrees. If that was the case then SCTs would not hold collimation on the other side of the meridian. There is definitely something wrong with your OTA. I would call Celestron.
Quote: If you do not think a large mirror titls on its bed of grease as it swings around the sky then you are entitled to that belief.
Quote:They told me to collimate on a real star near zenith to avoid mis collimation when the mirror tilts from horizontal.
Meade 305 ƒ/10.4 LX200 • Royce 250 ƒ/19 Dall Kirkham • AstroTech 250 ƒ/8 RC • AstroTech 250 ƒ/4 "RFT" Newtonian • Meade 80 ƒ/6 ED APO • TEC 140 ƒ/7 APO • Orion 180 ƒ/15 Mak Cass ... Denkmeier II binoviewer - Nikon 8x60 binocular
Astronomical Files from Black Oak Observatory