· Get a Cloudy Nights T-Shirt · Submit a Review / Article Click here if you are having trouble logging into the forums Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> Mounts Previous   Index   Next   Threaded   Pages: 1 shams42 Pooh-Bah Reged: 01/05/09 Loc: Kingsport, TN an Atlas guiding experiment       #4445873 - 03/13/11 12:40 AM Attachment (73 downloads) Edit   Reply   Quote Quick Reply   I've been imaging with a Meade SN6 but have thinking about moving up to a 8" f/4 Newtonian. I wasn't sure how my Atlas would handle the load, so I borrowed a similar scope from a club member. I did a 45 minute guide test with each scope back to back and did some analysis using the PhD log and a statistics package. I computed distance from the target centroid using the good old Pythagorean theorem at each log entry (sqrt of dx^2 + dy^2) and did an analysis of guide performance using that metric. Results are attached. I'm guiding with the SSAG and 50mm finder. You can see that the guide performance was basically identical for the 13 lb SN6 versus the ~18-20 pound 8" Newt. I also had to add another counterweight for the Newtonian, so the mount had quite a lot more weight on it in that configuration. Seeing was poor tonight (2/5 by CSC), so absolute guide performance wasn't great. Edited by shams42 (03/15/11 10:33 AM) Post Extras:       AstroGabe sage Reged: 01/10/10 Loc: SE Wisconsin Re: an Atlas guiding experiment [Re: shams42]       #4446929 - 03/13/11 02:25 PM Edit   Reply   Quote Quick Reply   Very cool analysis. What analysis package are you using? The plot looks like something R would give. I've been thinking of doing something similar, but haven't had time to do it. Would you mind making your analysis script available? Post Extras:       Jeff in Austin Pooh-Bah Reged: 02/26/07 Loc: TEXAS Re: an Atlas guiding experiment [Re: AstroGabe]       #4448046 - 03/13/11 11:34 PM Edit   Reply   Quote Quick Reply   Is Distance in pixels or arcseconds? Is the top one the SN6? Very interesting analysis. I recently moved from a 29.5 lb guide scope setup to a 22 lb OAG setup and my guiding improved incredibly, mostly due to flexure elimination. Also on the Atlas. Are you using OAG? Edited by Jeff in Austin (03/13/11 11:48 PM) Post Extras:       shams42 Pooh-Bah Reged: 01/05/09 Loc: Kingsport, TN Re: an Atlas guiding experiment [Re: Jeff in Austin]       #4451235 - 03/15/11 10:32 AM Edit   Reply   Quote Quick Reply   The top chart is the 8" f/4 Newt, the bottom is the SN6. I'm guiding with a piggybacked 50mm converted finderscope and SSAG. The distance is measured in pixels @ 5.4" / pixel. AstroGabe, the analysis was done in SAS but I could write a R script to do this if there was sufficient interest. Post Extras:       Gregk Carpal Tunnel Reged: 11/19/06 Loc: Gilbert Arizona Re: an Atlas guiding experiment [Re: shams42]       #4456962 - 03/17/11 11:02 PM Edit   Reply   Quote Quick Reply   Mind posting your PHD Brain configuration numbers Post Extras:       shams42 Pooh-Bah Reged: 01/05/09 Loc: Kingsport, TN Re: an Atlas guiding experiment [Re: Gregk]       #4456998 - 03/17/11 11:30 PM Edit   Reply   Quote Quick Reply   RA Aggr: 85 RA Hysteresis: 15 Dec guide mode: Auto Dec algorithm: Resist switching Max Dec duration: 1000 Calibration step: 3000 Min motion: 15 Post Extras:       Gregk Carpal Tunnel Reged: 11/19/06 Loc: Gilbert Arizona Re: an Atlas guiding experiment [Re: shams42]       #4457095 - 03/18/11 01:15 AM Edit   Reply   Quote Quick Reply   Thanks Taking notes . I use a 135mm lens and a Orion SS guider here are mine But I now have a CG-5mount RA Aggr: 95 RA Hysteresis: 10 Dec guide mode: Auto Dec algorithm: Resist switching Max Dec duration: 400 Calibration step: 1600 Min motion: 15 Edited by Gregk (03/18/11 01:16 AM) Post Extras:       AstroGabe sage Reged: 01/10/10 Loc: SE Wisconsin Re: an Atlas guiding experiment [Re: shams42]       #4457712 - 03/18/11 11:51 AM Edit   Reply   Quote Quick Reply   Thanks shams42, never used SAS. Would it be easy to translate to R? If there's not enough interest, perhaps you could explain to me via PM how the data was retrieved and I could write something. Post Extras:       kw6562 Authoritative Ignoramus Reged: 06/25/08 Loc: MA Re: an Atlas guiding experiment [Re: AstroGabe]       #4457913 - 03/18/11 01:25 PM Edit   Reply   Quote Quick Reply   Nice analysis shams42 - I use JMP at work sometimes which I guess is part of SAS. Re: AstroGabe - This can be done in Excel also - use the FREQUENCY function to bin the data and STDEV to find the standard deviation (assuming it is a normal distribution). What is R? I'm not familiar with it...Clear skies --Keith Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 18 registered and 33 anonymous users are browsing this forum. 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