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Peter in Reno
super member
Reged: 07/15/08
Posts: 192
Loc: Reno, NV
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I just bought Orion EON 80mm scope and ADM mini-dovetail to be mounted on C-11 and Atlas EQ-G mount. Without the guide scope, I already used three 11 pounds counter weights. How much more counter weight do you think I need to add or is it too much for Atlas EQ-G to handle?
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Celestron 11" OTA with ADM Losmandy dovetail
Orion EON 80mm
Orion Short Tube 80mm with ADM mini-dovetail and clam shell tube rings
Orion StarShoot Pro CCD camera
Orion StarShoot Auto Guider
Nagler 31mm
Ethos 13mm and 8 mm
2" William Optics diagonal
Atlas EQ-G with 1" CW shaft from Telescope Stability Systems, ADM Losmandy saddle.
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Zebra24601
Postmaster
Reged: 10/09/05
Posts: 7432
Loc: San Gabriel Valley, CA 91770
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I need four on my shorter-armed Sirius mount just to balance the C11. Be careful with your balancing and you should be fine by adding a fourth. But this really looks to be at the limit for the mount.
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Zebra24601
Meade 8" SCT w/UHTC * Celestron 100ED * Celestron C11 * Barska 15x70 binoculars
Meade LXD55 mount * Orion Sirius goto mount * Bushnell Voyager 4.5" Compact Reflector
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mielejr
sage
Reged: 05/29/05
Posts: 312
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From looking at the moment arms in your picture, I'd say you need almost twice as much in extra counterweight as that 80mm scope weighs.
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RAKing
scholastic sledgehammer
Reged: 12/28/07
Posts: 822
Loc: Clouds-ville, Virginia
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Peter,
Go to Robin Casady's web site. Besides producing some super cool astro goodies, he shows you how to calculate the counterweights.
http://www.robincasady.com/Astro/WeightCalc.html
Take care,
Ron
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Time spent looking at the stars is added to your life.
Orion XT10i / Moonlite CR2 -- The New "Time Machine"
"Hi Def" TV-102
C925-CF SCT
Ethos and Naglers
GM-8 GEM / A-P Portable Pier
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sang33ta
professor emeritus
Reged: 07/08/08
Posts: 539
Loc: UK
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I always prefer a longer arm to more weight.
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Hioptic 152mm f12.5 Maksutov
Celestron Advanced CG5-GT Mount (Mr Noisy!)
Meade 4000 Super Plossl Set
Casio QV-2900UX
Got fed up of waiting for Meade ETX-150 so put this together for £500/$1000 
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Peter in Reno
super member
Reged: 07/15/08
Posts: 192
Loc: Reno, NV
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Quote:
I always prefer a longer arm to more weight.
Is there a longer arm available for Atlas EQ-G mounts? Thicker arm would be nice to reduce flexure.
Thanks,
Peter
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Celestron 11" OTA with ADM Losmandy dovetail
Orion EON 80mm
Orion Short Tube 80mm with ADM mini-dovetail and clam shell tube rings
Orion StarShoot Pro CCD camera
Orion StarShoot Auto Guider
Nagler 31mm
Ethos 13mm and 8 mm
2" William Optics diagonal
Atlas EQ-G with 1" CW shaft from Telescope Stability Systems, ADM Losmandy saddle.
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mattyfatz
Pooh-Bah
Reged: 12/27/06
Posts: 1132
Loc: R E N O
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ScopeStuff used to have a toe weight. You thread it to the bottom of the arm in place of the end cap. I think it weighed a little less and it may work if your needs are in between weights. I was just on their sit but I could not find it.
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*****MATTY******
All sorts of stuff
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