Celestron C-8 SCT
Gary Honis modified Canon 450D (Baeder Mod)
MonoMods monochrome Canon 450D (Debayered, Baader filter, LPF1 removed)
ONAG On-Axis Guider
Starlight Xpress Lodestar Autoguider
Canon EF 200mm f/2.8L II USM
Olympus Zuiko 50mm f/1.8
1987 Meade LX3 2120 10" SCT on hypertuned EQ6 Pro Baader Self-Mod Canon XS_CLS Clip Filter DSI color_Orion ST80 Coulter 10" Compact Odessey Dob http://www.astrobin.com/users/shawnhar
AT8RC with Moonlite & Stepper Motor
Skywatcher 120mm ED PRO
Skywatcher HEQ5 with EQMOD, KWIQ Guider
Nikon D5100 Baader mod by Brent Oliver
12" GSO Dob with Argo-Navis, 102mm Skywatcher Short Tube
C11 Edge CGEM DX Gary Honis Modified T3i ASI120MC http://www.astrobin.com/users/astroricardo/
Bruce Vixen Visac VC200L AT65EDQ CGEM DX - hypertuned by Deep Space Products Atik 460EX mono w/EFW2 Astrodon Gen2 LRGB Astrodon 3nm Ha,OIII & SII Canon 500D (Gary Honis modified) Point Grey Chameleon (mono) Orion SSAG Ibuprofen Meadowlark Ridge Observatory http://www.flickr.com/photos/o...s/72157628590128971/
Francisco Celestron C-8 Orange, Stelarvue 105 TMB F6.2, Orion 80ED APO, Tasco 9VR. SBIG-10XME, DMK 21AU04.AS, ZWO ASI120MM, Canon 1000D, Canon T2i (modified by B.O.) Nikkor 180mm 2.8 , Takumar SMC 135, Tair 3S 300, nifty fifty, Canon 200mm 2.8, Rokinor 8mm FE MaximDL / BYE / PHD /DSS /PS Losmandy G-11, CGE, AstroTrac AG Orion Guider http://www.flickr.com/photos/f...oherreraphotography/
Quote:Hi Scott,You are one of the very few I know of that uses ONAG. I checked all of your images using ONAG and they are all excellent.
Quote:December 2012 issue of Sky & Telescope has a very positive review about ONAG. The author mentioned that he saw some kind of ghost reflection when a bright star was at or near center of the image but the reflection disappeared after he moved the bright star a little bit off center. He could not prove the reflection was caused by the cold mirror of ONAG. Have you ever notice any kind of refelctions like the author described?
Quote:I have been eyeing on ONAG. I like the idea of guiding on a star near the center of the DSO. It makes me wonder that there would be less noticable star trails around the center due to field rotation if the guide star was at the center of DSO in case the polar alignment was less than ideal.I have been using Hutech OAG/Lodestar with C-8 EdgeHD at 2000mm focal length with great success. I give Lodestar more credit because it's so sensitive that it finds at least one suitable guide star in OAG's guide port FOV without ever hunting for one. I am wondering if I would get better guiding results with ONAG than OAG since guide star can be at the center of DSO instead of off-axis.
Quote:Thanks for your time writing this up. So far I've not notice field rotation in my images using OAG. My setup is always portable. I have a A-P Mach1 and it has a cool and quick way to do polar alignment and I can get it done within 10 to 15 minutes and pretty accurately.I am just a little concerned for difficulty of finding guide stars for images I have not yet image. I live in fairly high light pollution area and was worried the next time I image I won't be able to find a guide star. I cannot easily rotate my OAG because it will collide with JMI MotoFocus. One big plus of ONAG is no rotation is required. Also, ONAG could give me a guarantee that it will easily find a suitable guide star due to huge available FOV in guide port.Thanks,Peter