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AlienRatDog
Pooh-Bah
Reged: 07/15/05
Posts: 1088
Loc: Ann Arbor
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HAs anyone tried this (visual)??
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Abe -- the poor PhD student
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12" LX200GPS-SMT w/UHTC
Explore Scientific 127mm Triplet ED APO
Losmandy GM8 EQ mount
Nagler 31mm, 17mm, 13mm, 12mm, 9mm, 2.5x Powermate
12X50 Binoculars
Understanding wife
One beautiful daughter, Emma-Rose (born 7-29-2009)
Twin boys (cats), half Persian/half Alley Cat but all Vermin!
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watcher
sage
Reged: 11/21/07
Posts: 406
Loc: NJ
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I'm probably in the minority, but I think I would do it. The fact that I'm in the minority though, might be cause for you to have a backup plan.
Joe
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(quote)"That does it! Next Big Bang, someone has got to rethink this gettin' old business!" Joe Daugert
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1986 Celestron c-8 (retired)
Celestron Omni XLT 120
Celestron Astromaster 70 AZ
Vixen GP2 mount on Omni XLT tripod (soon to be driven by iOptron GOTO Nova)
Meade 16x50 binoculars
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Lane
Carpal Tunnel
Reged: 11/19/07
Posts: 1512
Loc: Frisco, Texas
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The GM-8 is rated at 30lbs, the same as my Sirius mount. I will not even use the C9.25 on the Sirius, just way to much vibration for me. But I am inclided to believe that Losmandy is one of those companies that is conservative with their load estimates. I know for a fact Takahashi is like that, when they say a mount holds 30lbs, it actually holds 30lbs and holds it steady.
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Mounts: CGEM, ORION SIRIUS, AT Voyager/motorized
SCTs: C6, C8, C9.25, C11,
Refractors: TV Pronto, Orion ED80
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Catapoman
scholastic sledgehammer
Reged: 06/06/03
Posts: 775
Loc: VA
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I once had a C9.25 mounted on my GM-8 and it worked well, but was nearing the mount's limit. I think a C11 would be pushing it.
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Pernel
Nexstar 11 GPS
Takahashi TSA-102
Mewlon 210
GM-8
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jrcrilly
Refractor wienie no more
Reged: 04/30/03
Posts: 25195
Loc: NE Ohio
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Quote:
I once had a C9.25 mounted on my GM-8 and it worked well, but was nearing the mount's limit.
There was, briefly, a beefed-up version called the G9 that was intended for use with the C9.25 (the GM-8 was intended for use with the C8). I believe that they ended up adding the upgraded components to the standard GM-8 so later ones are a little beefier than the original GM-8. The G11 is intended for use with the C11.
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John C
Urban Observatory
A&M/Astreya 76mm F/6 APO
TMB/LOMO 80mm F/7.5 APO
Tak FSQ-106N F/5 APO
Meade 178ED F/9 "APO"
Meade ETX-125AT
C14
Teeter 20" F/3.8 truss Newt w/ServoCat
CI-700, NJP, GPDX/SS2KPC, CG5-GT
ST-10XME, DSI Pro
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stevew
Pooh-Bah
Reged: 03/03/06
Posts: 1143
Loc: Vancouver
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C11 on a G11. Does it for me.
Steve
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TV Genesis SDF
Meade 127ED
Antares 152
Celestron C5
Celestron C8
Celestron C11
Coulter Odyssey 8
16 Dobsonian
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Takman
super member
Reged: 02/25/09
Posts: 195
Loc: Maple, ON - Canada
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I have a C11 and I wouldn't want to put it on anything less than an Atlas or EQ-6. Although a GM-8 is a worthy mount, I doubt you be satisfied with a C-11 mounted on it. However, if you are inclined to try it, you can add VSPs (vibration suppression pads) to your setup, which will help with vibrations.
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Takahashi TOA-130F
Celestron C-11/C-8 with FASTAR
William Optics Zenithstar 66 SD/ED Petzval
Astro-Physics Mach1 GTO/Celestron AS-GT
TeleVue Naglers 26mm, 13mm, 7mm and 3.5mm
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GShaffer
professor emeritus
Reged: 02/28/09
Posts: 644
Loc: Augusta GA
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For visual it works fine for me with my C11 and GM8....thats not to say it doesnt work better on my G11 
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APM 8" f/9.0 Achro
Meade 6" AR6 f/8.0 Achro
Celestron C11, Intes MK67
Vixen ED102SS, FL102S, ED102S, NA140SS, R200SS, WO Megarez 80 w/TMB Fluorite Optics
SV70ED, AT66ED
LXD75/LX200, Ioptron Mini-tower, SP, GP-DX, CG5 ASGT, LXD650, GM-8, GM-100, G11, Gemini 40
4" portable AP convertable 44" or 70" pier
APM 100mm Binos Millenium Mount, Dobstuff 10" DOB
Augusta GA
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AlienRatDog
Pooh-Bah
Reged: 07/15/05
Posts: 1088
Loc: Ann Arbor
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Were vibrations all over the place?
--------------------
Abe -- the poor PhD student
-----------------------------------------
12" LX200GPS-SMT w/UHTC
Explore Scientific 127mm Triplet ED APO
Losmandy GM8 EQ mount
Nagler 31mm, 17mm, 13mm, 12mm, 9mm, 2.5x Powermate
12X50 Binoculars
Understanding wife
One beautiful daughter, Emma-Rose (born 7-29-2009)
Twin boys (cats), half Persian/half Alley Cat but all Vermin!
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GShaffer
professor emeritus
Reged: 02/28/09
Posts: 644
Loc: Augusta GA
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Nope.....that would contradict what I said....which was it worked fine for visual.
Quote:
Were vibrations all over the place?
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APM 8" f/9.0 Achro
Meade 6" AR6 f/8.0 Achro
Celestron C11, Intes MK67
Vixen ED102SS, FL102S, ED102S, NA140SS, R200SS, WO Megarez 80 w/TMB Fluorite Optics
SV70ED, AT66ED
LXD75/LX200, Ioptron Mini-tower, SP, GP-DX, CG5 ASGT, LXD650, GM-8, GM-100, G11, Gemini 40
4" portable AP convertable 44" or 70" pier
APM 100mm Binos Millenium Mount, Dobstuff 10" DOB
Augusta GA
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Luigi
Post Laureate
Reged: 07/03/07
Posts: 4938
Loc: MA
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I've never used a C11 on either the CG5 or GM8. I owned a C11 on a G11 for 10+ years. It was a great combo. I wanted a smaller and lighter mount for some smaller OTAs so considered the GM8. I poked around and asked questions and decided a CG5 would be at least as good for visual, had superior features, and was way cheaper than the GM8. Celestron sells the C11 on a CG5 (upgraded when the started doing it) and I think it'll work as well, if not better, than a GM8. Naturally, there are other considerations.
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17.5" f/5 Dob. IM-715 MCT. 120ED. Lunt 60mm Ha.
Zeiss, Leica, Fujinon, Nikon, Pentax, Bushnell bins
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AlienRatDog
Pooh-Bah
Reged: 07/15/05
Posts: 1088
Loc: Ann Arbor
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I don't know if the CG5 would be better than a GM8, I own both at the moment and the GM8 definitely feels much more robust than the CG5, though it is lacking GOTO features (which I did not like on the ASGT mount anyways)...
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Abe -- the poor PhD student
-----------------------------------------
12" LX200GPS-SMT w/UHTC
Explore Scientific 127mm Triplet ED APO
Losmandy GM8 EQ mount
Nagler 31mm, 17mm, 13mm, 12mm, 9mm, 2.5x Powermate
12X50 Binoculars
Understanding wife
One beautiful daughter, Emma-Rose (born 7-29-2009)
Twin boys (cats), half Persian/half Alley Cat but all Vermin!
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Phil Cowell
sage
Reged: 05/24/07
Posts: 376
Loc: Southern Tier NY
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Quote:
I don't know if the CG5 would be better than a GM8, I own both at the moment and the GM8 definitely feels much more robust than the CG5, though it is lacking GOTO features (which I did not like on the ASGT mount anyways)...
Mechanically the GM -8 would probably have an edge, electronically the ASGT has better features. To be honest I wouldn't use either with a C11 but would look at the next class of mounts up (G11 or CGE)
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If it'll fit on a sig you don't have enough
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old_frankland
professor emeritus
Reged: 03/28/05
Posts: 515
Loc: San Francisco Bay Area
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I have a C9 with small finder on a GM8 and consider the mount pretty much max'd out. Focusing can be a bit time consuming due to scope shake, but once focused the mount is adequate for viewing and lunar and planetary imaging. Balance has to be really good with the C9/GM8 or else the dec slow motions aren't very smooth.
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Cheers,
Jim
Livermore CA
http://www.lafterhall.com/astro.html
3" APO, 4" ED refractor, 9" SCT, GM8
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Brian L
super member
Reged: 11/17/08
Posts: 119
Loc: The garden paradise of Pittsbu...
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I'd worry about the mount being a little top-heavy and prone to tipping.
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WO FLT-110 f/6.5, TEC optics
Losmandy G-11 Gemini
Meade 10" LX200 GPS/UHTC
Questar 3.5" Standard
Vixen VMC-110L
Canon 450D, unmodified
Assortment of TV Panoptic, TV Radian, Vixen LVW, and WO eyepieces
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Luigi
Post Laureate
Reged: 07/03/07
Posts: 4938
Loc: MA
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>>>I'd worry about the mount being a little top-heavy and prone to tipping. <<<
If it's properly balanced, the CG of the scope and CWs is at the intersection of the RA and Dec axes. Adding the weight of the mount itself moves the CG a bit further down and might or might not move it closer to the az axis. This net CG needs to project downward within the triangle formed by the legs of the tripod to be stable. The closer it is to the center of the triangle, and the larger the triangle, the more stable.
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17.5" f/5 Dob. IM-715 MCT. 120ED. Lunt 60mm Ha.
Zeiss, Leica, Fujinon, Nikon, Pentax, Bushnell bins
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GShaffer
professor emeritus
Reged: 02/28/09
Posts: 644
Loc: Augusta GA
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I have both a ASGT and a GM8....and have used my C11 on both.....The GM8 might be a bit more stable but it is close.....
Quote:
I don't know if the CG5 would be better than a GM8, I own both at the moment and the GM8 definitely feels much more robust than the CG5, though it is lacking GOTO features (which I did not like on the ASGT mount anyways)...
--------------------
APM 8" f/9.0 Achro
Meade 6" AR6 f/8.0 Achro
Celestron C11, Intes MK67
Vixen ED102SS, FL102S, ED102S, NA140SS, R200SS, WO Megarez 80 w/TMB Fluorite Optics
SV70ED, AT66ED
LXD75/LX200, Ioptron Mini-tower, SP, GP-DX, CG5 ASGT, LXD650, GM-8, GM-100, G11, Gemini 40
4" portable AP convertable 44" or 70" pier
APM 100mm Binos Millenium Mount, Dobstuff 10" DOB
Augusta GA
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Jeff B
professor emeritus
Reged: 12/30/06
Posts: 678
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Abe:
Should be no trouble for visual use at all.
The GM8 is my work horse mount
It and my TEC 8 are a great visual combo. Damping times are about a second with no annoying high frequency vibrations during focusing at high power.
Coming in at ~31 pounds as shown, I would imagine, except for tube OD, it's of similar length and mass as a C11.
Jeff
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