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WTB CG goto mount (closed)
Posted: Wed Aug 01, 2007 12:52 pm
by michael
Hi,
Sorry this is closed...
thank you.
Posted: Wed Aug 01, 2007 1:43 pm
by ariefm71
Posted: Wed Aug 01, 2007 2:51 pm
by weixing
Hi,
Want to buy a GP mount with motor drive or without. payload must be 7 to 10 kg.
I think what you need is a GPD mount, not a GP mount.
Have a nice day.
Posted: Thu Aug 02, 2007 11:06 am
by Meng Lee
Hi, I strongly feel that CG-5 with a 10" Newtonian is an overloading situation. Commerical companies always overload their mounts. In my opinion, Atlas mount can support it adequately, as you can see on Orion's webpage.
If the mount is overloaded, you will see endless vibrations and it wears out the shaft very easily.
Just my personal opinion.
Posted: Thu Aug 02, 2007 3:24 pm
by perseid
I agree with Meng Lee. CG5 can't support the 10" newt. You'll need at least Atlas or EQ6 equivalent mount. I have been using my EQ6 with 8" newt for astrophotography, and it is just nice. 10" newt should be OK, as long as you don't put too much extra weight on top of it.
It is better to be underload than to overload. I would always keep my loading about 20% less than the rated max loading of a mount. (unless it's a takahashi or other expensive ones)
Posted: Thu Aug 02, 2007 8:04 pm
by Meng Lee
Ya. I am not sure but you can read mount loadings like this:
Synta: their max load value is maybe 20% too high. So take 80% of the value for max visual loading. For astrophotography, take a further 75%.
Takahashi: Their max load value is the max load for astrophotography.
typically, astrophotgraphy max load value is 75% of visual max load value.
EQ mount
Posted: Fri Aug 03, 2007 10:14 am
by michael
how much will cost EQ6 with goto/ without.?
Posted: Fri Aug 03, 2007 10:19 am
by Meng Lee
Hi,
Arief is selling one. Let him tell you what is the price. Or if you want brand new, then :
http://www.telescope.com/shopping/produ ... tID=198749
But I must warn you that this is a massive mount. Not easily tansportable.
how about Vixen GPD2
Posted: Fri Aug 03, 2007 10:24 am
by michael
how about vixen GPD2 can support 10 inch newtonian..right? howabout the pricing for used one...?
Posted: Fri Aug 03, 2007 10:29 am
by Meng Lee
Er, if you don't mind lots of vibration and wearing out of the RA shaft, then you can try a GPD2. If the 10" Newtonian is about 27 lbs (~12kg), then the overload on GPD2 is then about 3 kg.
Don't think there is any used GPD2 in singastro now. you can check around.
I am using this as a 10" Newtonian example:
http://www.telescope.com/shopping/produ ... tID=250637