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Equipment Discussions >> Mounts

Pages: 1
Emanuele
Lord of the Ring
*****

Reged: 11/19/03

Loc: Brescia-Italy, and Iowa-US
GPDX / EM10 new
      #4244042 - 12/12/10 11:38 AM

Hi all.

Just wondering if a GPDX or EM10 could carry an FSQ85 + FLI ML8300 + CFW2-7 + accessories.
I think it is almost 30lbs of payload.

Would one of those two mounts be enough for AP with the FSQ?

Thank you,
E.


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jsiska
professor emeritus
*****

Reged: 07/12/06

Loc: NW Ohio
Re: GPDX / EM10 new [Re: Emanuele]
      #4245031 - 12/12/10 08:44 PM

In my 2003 Vixen catalog the maximum loading weight (OTA + camera equipment) for the GP-DX is 10kg = 22.046 pounds. The required counter weights for operating the GP-DX was not counted as a factor in the max loading weight.

Newer catalogs may have stated a much higher maximum loading weight; however, as I understand it this higher max loading weight includes the counterweights.

From:

http://web.archive.org/web/20070708140731/http://www.newastro.com/wodaski/review_GP_DX.htm#adjust_backlash

Notice that for unguided astrophotography Ron Wodaski author of THE NEW CCD ASTRONOMY was able to get 90 to 120 seconds without star trails to 6 arcseconds without PEC. To accomplish that Ron had a 7.711kg = 17 pound load on the mount.

Jim
----------------------
GPDX-C102F with Moonlite Motorized focuser + Skysensor 2000PC version 2.06 with version 2.10 chip.
Meade 880, 8” f/6 RG Newtonian.
Meade 10" f/4.5 Starfinder dob.
Tasco 7TE, 60mm, f = 910mm,
1962 60mm, f/11.7 Tasco 9TE with custom visual back & remounted on a GEM.

Edited by jsiska (12/12/10 09:12 PM)


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Gary.McK
member


Reged: 01/29/09

Re: GPDX / EM10 new [Re: Emanuele]
      #4245084 - 12/12/10 09:34 PM


I have a Vixen GPD2, which tracks beautifully, but I do not think that it would carry the weight you want to. It is rated at 10kg (about 22Lbs). Mine is currently carrying 11.5 kg (about 25 Lbs) I think this is too much for imaging and I intend to move to a lower weight by re building my OTA in carbon fibre. I would think that for rock solid imaging about 8 or so kg (17-18 LBS) would be nice. Mind you my rms tracking errors with the above heavy system are limited by my local seeing. I get better than .2 pixels rms with a 200mm guidescope and qhy5 camera. I just feel like the mount would be doing things easier with a lower weight.....
fwiw
Gary


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bardo
scholastic sledgehammer
*****

Reged: 09/13/09

Loc: US
Re: GPDX / EM10 new [Re: Gary.McK]
      #4245149 - 12/12/10 10:15 PM

my GPDX could handle about 20lbs imaging at 1300mm just fine.

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Panotaker
sage


Reged: 09/12/03

Loc: Austin, Texas
Re: GPDX / EM10 new [Re: bardo]
      #4245220 - 12/12/10 11:02 PM

I have imaged with my GPDX carrying a AP-130f/6 on a windless night with no problem. A slight breeze would have made it impossible. I can image with it carrying my TV85 with no problems. I use a converted finder as my guide scope. I would think it should handle a 4" refractor since that is what Wodasky used. I believe he used an AP Traveler.

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Emanuele
Lord of the Ring
*****

Reged: 11/19/03

Loc: Brescia-Italy, and Iowa-US
Re: GPDX / EM10 new [Re: Panotaker]
      #4245561 - 12/13/10 06:18 AM

Thank you guys for the feedback.
Judging from your replies, I think the GP-DX and Em10 are not going to be able to hold the FSQ and CCD. Ot least not when a slight breeze is present.
The mount market needs a slightly higher capacity mount, comparable to those two...

E.


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Rat8bug
Carpal Tunnel
*****

Reged: 01/07/05

Loc: Michigan
Re: GPDX / EM10 new [Re: Emanuele]
      #4271993 - 12/26/10 12:44 AM

The GP-DX load limit of 22 pounds has always been conservative. This Vixen will easily handle about 28 lbs, using proper counterweights and tripod imo.

http://www.barrie-tao.com/wotriplet.html

Ciao...Barry


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Gianluca67
sage


Reged: 11/26/08

Loc: Italy
Re: GPDX / EM10 new [Re: Rat8bug]
      #4291821 - 01/04/11 05:09 PM

I agree. I use the GP DX for CCD imaging and can get unguided single exposures up to 2 min at 800 mm fl with 28.5 lbs (13 kgs.) on it as well as 12 Kgs. of counteweights. No issue at all. About wind I have found that if it is more than breeze the GP DX does not work optimally regardless of the load.

Ciao

Gianluca


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SPACEMAN
sage


Reged: 01/30/05

Loc: grömme,Belgium
Re: GPDX / EM10 [Re: Gianluca67]
      #4441695 - 03/11/11 05:31 AM

thanks everybody for this topic, i also have an Vixen GP DX,
and i have a M100B from lichtenknecker Optics. For the M100B The heavy weight 35cm(14") tube will go on that mount.
For imaging with the 20cm telescope, i want to buy paralax rings. But they are heavy: 7lbs, Total weight wil be around 12kg also, so if read this, i will be good with mine old green version gp dx

Edited by SPACEMAN (03/11/11 05:33 AM)


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