"Life is a journey, enjoy the ride" *********** Stellarvue 90 Raptor CF.Explore Scientific 152mm Comet Hunter.Orionx14g.Borg 125SD.Borg 60ED. Borg 50Achro. AT10RC. AT6RC. iOptron iEQ45GTN w/TDM.iOptron ZEQ25.iOptron Cube Pro.iOptron MT Pro/iOptron SmartEQ Pro.Celestron 10x50 Way too many EPs, flatteners and reducers. Nikon D5100, Canon T3i and a bunch of filters.
Quote: but rather the measure of how tight it guides.
My images: http://mtanous.wordpress.com
Quote:Hi Paul,You don't need perfect polar alignment to measure PE... PECprep will remove the drift caused by polar misalignment.Residual Error after guiding is not very meaningful cause it is tie to seeing, guiding equipment, mount operator etc.Just be careful to compensate for DEC when reporting tracking error.Cheers,Jose
Tak AP QSI Canon
Developer of Hyper-Modded 450D and iAstroHub Astro-physics 155EDT, Takahashi FSQ85EDX Losmandy G11 Gemini, iOptron ZEQ25GT QHY8L, QHY6, QHY5L-ii-c
Tony Nevada City, California
Stellarvue SVQ 100, iOptron ZEQ25, Olympus E-PL5, E-M5, E-M1
Skywatcher 6 inch F-5 Newtonian,Lunt LS60THa,Orion ED80T CF ED Triplet,Vintage C-8(1983),Celestron 8se, Celestron CG-5,iEq45, Atik 314L+Mono,Atik 314 L+ OSC, Imaging Source DMk 41AUO2 My images viewed here.. http://www.astrobin.com/users/northisup2/
Quote:This is crazy-good ...
http://www.astrobin.com/users/orion69/ TS 150 mm APO Triplet, Feather Touch 3.5" focuser, Micro Touch Focusing System CGEM on custom made platform Atik 383L+ mono, Atik filter wheel, Baader LRGBC + narrowband filters SX Lodestar + TSOAG9 Dew-Not heater
Quote:Quote:This is crazy-good ...
This was probably guided with finder scope, if so it doesn't say much.
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
Quote:On the contrary, I think it says it all.
Quote:Quote:On the contrary, I think it says it all. Most mounts will have PHD graph that smooth if guiding with finder. So, no, it does not say all at all. Of course, that does not mean that resulting image can't be good.
Astrophoto: Intes Micro ALTER-M606 (6" f/6 MCT), Astrotech AT6RC (6" f/9 RC), 2x Tair-3 lenses (300mm f/4.5)
Visual: Celestron 8 SCT ('77 Orange Tube, 8" f/10), Selsi #247 Refractor (aka Towa #339, 80mm f/15), Tasco 11TE-5 Newtonian (4.5" f/7.9), Galileoscope (50mm f/10)
Mounts: Celestron CI-700, iOptron ZEQ25GT, Celestron CG5-ASGT, plus a couple old EQ2s
My Astrophotography Site: http://ap.x-wing.ca/
Quote:Actually I would say that most mounts in this price range do NOT necessarily give such good results, even with 50mm finder-guiders.
Uncle Rod Uncle Rod's Astroblog: http://uncle-rods.blogspot.com/
Quote:Quote:Quote:This is crazy-good ... This was probably guided with finder scope, if so it doesn't say much. On the contrary, I think it says it all. That's how most imagers will use the mount? A mount that won't guide smoothly just adds to the frustration of imaging, taking up more time with PHD than with actually taking some images. If you don't want to use a guide scope, there are plenty of mounts in the $7~10K price range that will deliver 5 minute unguided images. But I guarantee you're not going to be carrying them out every time it's clear enough to image. This mount takes all of ten minutes to set up, polar align and star align, and then start imaging. Tear down at the end of the night is the same.Just my humble opinion... Paul
Quote:Quote:This is crazy-good ... This was probably guided with finder scope, if so it doesn't say much.
Quote:Hope the graph here is a useful data point for someone...
SVR90 Raptor QHY9C OSC Camera ZEQ25 EQ Mount Porta II Alt-Az
Quote:Quote:Hope the graph here is a useful data point for someone...
A couple of minor points John. The worm period for the ZEQ is 600 seconds, so you need to set that in PecPrep. You have it set to 479.
After you load your PHD log, check 'Mag Period' and uncheck all the other boxes to see the raw PE in the mount.
Oh, once you tighten up the mount a bit, it will improve.
Good luck and thanks for the data.
Quote:You got it! Here is the just the first two frequencies plotted and I used the Vixen GP mount option...
Quote: Since the Z has 144 teeth, its worm period is (86164 / 144) = 598 seconds.You can use the corrected King rate so (86188 / 144) = still 598 seconds.
Quote:Take the mount somewhere you can drift align it properly and repeat the test, and not make any assumptions that is 5 seconds peak to peak.
Quote:Correct me if I'm wrong, is this actually measured using Borg 250mm FL? Is graph compensated for FL of the main scope?