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Patrick
Postmaster
Reged: 05/16/03
Posts: 7809
Loc: Franklin, Ohio
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Quote:
My two basic imaging setups are
1. Equinox 80 Pro with KWIQ Guider (500mm imaging focal length with 7x50 finder as a guide scope).
2. C8 (usually with f/6.3 reducer) and a Scopos Observer 62 guide scope (1350mm imaging focal length and 520mm guiding focal length).
I have tweaked now my setup so that I can take 10 min subs with both combos.
Hi Tapio,
What imaging camera are you using with your setup? What is the pixel size?
Patrick
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10" f/6 Truss Tube Newtonian
Celestron C6S-GT SCT
AT66ED Refractor
Oberwerk Ultra 15x70 Binocular
475B Geared Tripod & 501HDV Head
Celestron Regal 8x42 Binocular
Canon XSi; Meade DSI;SPC900-NC
Vixen GP2 Photo Guider Mount
My Astronomy Pages
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AlanT
sage
Reged: 08/20/07
Posts: 488
Loc: 122º36' W, 47º37' N, WA USA
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Thought it might be helpful to show a sample of out-of-the-box performance of a GM-8. So I went back and looked at my guiding logs. Here's a typical sample:
This is a new GM-8, I've only used it about 6 outings now. I did do PEC training on the mount the first night, but I don't know how good the training really is, but PEC was enabled. The mount had about 18 lbs of gear on it and 11 lb counterweight. Guided with a modified 50mm finder and DSI pro via PHD.
The "noise" in the raw data is pretty high and was about +/- 4", the average guiding performance is as shown at a bit over +/- 1 ". Not great, but I'd say not bad for a new mount with no tweaking.
Just provided as a sample, I'm sure every GM-8 will be a little different.
al
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al
Meade 80mm APO
Celestron 6" SCT
CGE, GM-8, & CG-5 GT
ST-2000xcm, DSI Pro II, DSI Pro
( www.alberts-astro.com/astro )
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Patrick
Postmaster
Reged: 05/16/03
Posts: 7809
Loc: Franklin, Ohio
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Hi Alan,
Thanks for posting the chart! Awesome!
Thanks,
Patrick
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10" f/6 Truss Tube Newtonian
Celestron C6S-GT SCT
AT66ED Refractor
Oberwerk Ultra 15x70 Binocular
475B Geared Tripod & 501HDV Head
Celestron Regal 8x42 Binocular
Canon XSi; Meade DSI;SPC900-NC
Vixen GP2 Photo Guider Mount
My Astronomy Pages
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Tapio
super member
Reged: 09/24/06
Posts: 157
Loc: Tampere, Finland
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Patrick,
I do imaging with SXV-H9C or Atik 314L+ - both with 6.45uM pixel size.
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Tapio
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Patrick
Postmaster
Reged: 05/16/03
Posts: 7809
Loc: Franklin, Ohio
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Thanks Tapio.
--------------------
10" f/6 Truss Tube Newtonian
Celestron C6S-GT SCT
AT66ED Refractor
Oberwerk Ultra 15x70 Binocular
475B Geared Tripod & 501HDV Head
Celestron Regal 8x42 Binocular
Canon XSi; Meade DSI;SPC900-NC
Vixen GP2 Photo Guider Mount
My Astronomy Pages
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jeffweiss9
member
Reged: 11/09/08
Posts: 53
Loc: Sunnyvale, CA
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Thanks for all the great suggestions in this thread. I am really grateful. What a great group here. It is very encouraging to know so many fellow back-afflicted (and just weight-adverse) folks have developed ways to do good AP with a lighter mount. I've got 13 or 14 really helpful, and probably affordable, ideas in a list to pursue further before moving on a new setup (once I'm good enough to get out there to use whatever I end up doing). That's likely to involve at least one OAG (I've purchased the Orion but the TS Optics sure looks good) and 1 or both of my refractors and, almost certainly, the GM-8.
I'll throw out one additional lighter-mount idea that I picked up reading a different thread here: using one of the self-guiding SBIG cameras (ST-2000 for example) along with their AO-8 adaptive optics unit should enable by tilting the optics 10 times per second guiding out even the larger and sharper PEC curves. However, the cost for the camera part of that solution, on top of that of the mount itself, is probably beyond my price range but it seems an particularly attractive one to think about.
-Jeff
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LX90GPS 8"
SVR90
AT66ED
DSI Pro II (2)
AIP4WIN, PS CS2
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