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Equipment Discussions >> Mounts

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moynihan
Carpal Tunnel


Reged: 07/22/03

Loc: Lake Michigan Watershed
GEM for 6" f/8 Newt
      #5790673 - 04/10/13 04:36 PM

Hello,
What German equatorial mounty would you pic for mounting a 6" f/8 newtonian ota?

For visual use only.

To anticipate one line of answer, I am familiar with dob mounts, i use a dob, do not want to mount it on a dob, thanks.

Edited by moynihan (04/10/13 04:56 PM)


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Falcon-
Post Laureate
*****

Reged: 09/11/09

Loc: Gambier Island, BC, Canada
Re: GEM for 6" f/8 Newt new [Re: moynihan]
      #5791023 - 04/10/13 06:37 PM

I would guess my M606 should be similar in weight/length to your 6" f/8 newt. I have used that on a CG-5 successfully. Perhaps then a Celestron AVX (the CG5's sucessor) might be the way to go, or for a slightly more beefy mount, an Orion Atlas.

If you are budget constrained a Celestron Omni-CG4 might work (not quite as beefy as an AVX, manual, no automatic go-to). If you just won the lottery a Losmandy GM8 or G11 are *excellent* quality mounts.

Ya, I know... not exactly a single answer


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Mel M
super member
*****

Reged: 05/04/08

Loc: southern Oregon
Re: GEM for 6" f/8 Newt new [Re: moynihan]
      #5791042 - 04/10/13 06:46 PM

My 6" f/6 newt is a little under-mounted on a GM-8. Usable but not solid.

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Kendahl
member


Reged: 02/02/13

Re: GEM for 6" f/8 Newt new [Re: Mel M]
      #5791141 - 04/10/13 07:48 PM

Orion used to sell a 6 inch f/8 Newtonian on their Skyview Pro GEM. (It's still available as a dob.) The combination works well for strictly visual observation. Current price for the mount alone is $400. The mount really benefits from spending another $60 for a polar alignment scope and $150 for dual axis drive. That increases the total to $610 and it's still not a GoTo mount. OPT will sell you a left over CG-5 GoTo for $550. That strikes me as the better deal. An Advanced VX mount would be even better but, with a price of $800, it's not as good a bargain.

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skywolf856
sage


Reged: 01/25/08

Loc: SE Michigan
Re: GEM for 6" f/8 Newt new [Re: Kendahl]
      #5791230 - 04/10/13 08:21 PM Attachment (29 downloads)

I mount my 8" f7 on my CG5.
It works for visual use.


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moynihan
Carpal Tunnel


Reged: 07/22/03

Loc: Lake Michigan Watershed
Re: GEM for 6" f/8 Newt new [Re: Mel M]
      #5791413 - 04/10/13 10:09 PM

Quote:

My 6" f/6 newt is a little under-mounted on a GM-8. Usable but not solid.




I find that very interesting, given its stated load capacity. Is it the standard legs?


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moynihan
Carpal Tunnel


Reged: 07/22/03

Loc: Lake Michigan Watershed
Re: GEM for 6" f/8 Newt new [Re: skywolf856]
      #5791419 - 04/10/13 10:11 PM

Quote:

I mount my 8" f7 on my CG5.
It works for visual use.




That is a beautiful scope.


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MikeCMP
super member
*****

Reged: 07/12/11

Loc: Chardon OH
Re: GEM for 6" f/8 Newt new [Re: moynihan]
      #5791434 - 04/10/13 10:16 PM

I use an atlas for my 5" newt. Works for visual and photography. But I bet it is way more mount than you need.

Do you need go-to for your mount? If not, the. An eq-4 might fit the bill for you too.

Mike


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moynihan
Carpal Tunnel


Reged: 07/22/03

Loc: Lake Michigan Watershed
Re: GEM for 6" f/8 Newt new [Re: MikeCMP]
      #5791485 - 04/10/13 10:37 PM

Quote:

Do you need go-to for your mount?


Nope. do not need go to.

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Falcon-
Post Laureate
*****

Reged: 09/11/09

Loc: Gambier Island, BC, Canada
Re: GEM for 6" f/8 Newt new [Re: moynihan]
      #5791652 - 04/11/13 12:30 AM

Well... if you do not need go-to...

Check out the classifieds here and other such places and keep an eye out for a used non-goto Orion Atlas (aka Skywatcher EQ6) or non-goto Losmandy G11. If one of those fit in your budget you would end up with a much more stable mount then a CG4 would give you.

(what counts as "stable" and vibration-free is a matter of personal preference of course. You may find the OmniCG4 or an older used non-goto CG5 would be perfectly fine for you. Just stay away from the EQ1/CG2 or EQ2/CG3 - those tend to be quite shaky even with smaller scopes)


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Husbyggarn
sage


Reged: 12/12/08

Loc: Sweden
Re: GEM for 6" f/8 Newt new [Re: Falcon-]
      #5791734 - 04/11/13 02:38 AM Attachment (19 downloads)

I have my 6" F5 on the old black non-goto skywatcher Heq5 (Orion sirius).
Works great for photo and visual.
I understand F8 is much longer than F5 but for visual i think it would work.


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moynihan
Carpal Tunnel


Reged: 07/22/03

Loc: Lake Michigan Watershed
Re: GEM for 6" f/8 Newt new [Re: Husbyggarn]
      #5791877 - 04/11/13 08:06 AM

Thanks for all the input folks

jay


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Jon Isaacs
Postmaster
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Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: GEM for 6" f/8 Newt new [Re: moynihan]
      #5791888 - 04/11/13 08:19 AM

Quote:

Thanks for all the input folks

jay




Jay:

It really depends on the weight of the OTA. The classic 6 inch F/8 Newtonian is the RV-6. The RV-6 tube is phenolic and the complete OTA minus rings weighs 8 pounds. It rides reasonably well on the original mount, a AstroView or CG-4 does a reasonable job with it as well.

A CG-5ASGT would be overkill but do a nice job. I find that a CG-5ASGT is fine for my 8 inch F/5, people put 10 inch F/5s on them and C-11s, the 10 inch F/5 OTA is around 30lbs... Not me.. That's what Altas's are for, not for 6 inch F/8's...

How heavy is your OTA???

Jon


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moynihan
Carpal Tunnel


Reged: 07/22/03

Loc: Lake Michigan Watershed
Re: GEM for 6" f/8 Newt new [Re: Jon Isaacs]
      #5791907 - 04/11/13 08:36 AM

Quote:



How heavy is your OTA???

Jon




Fully loaded it will be about 17-18 pounds.


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obin robinson
Carpal Tunnel
*****

Reged: 10/25/12

Loc: League City, TX
Re: GEM for 6" f/8 Newt new [Re: moynihan]
      #5791921 - 04/11/13 08:47 AM

If you are on a budget look for a used Meade Starfinder EQ. I have a 10" scope on it and the mount swings it smoothly without a problem.

obin


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Mirzam
Post Laureate
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Reged: 04/01/08

Loc: Lovettsville, VA
Re: GEM for 6" f/8 Newt new [Re: obin robinson]
      #5791969 - 04/11/13 09:17 AM Attachment (14 downloads)

RV-6 on a GM8. Works great, although as mentioned above the RV-6 OTA is exceptionally light weight.

JimC


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Jon Isaacs
Postmaster
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Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: GEM for 6" f/8 Newt new [Re: moynihan]
      #5792313 - 04/11/13 12:52 PM

Quote:

Quote:



How heavy is your OTA???

Jon




Fully loaded it will be about 17-18 pounds.




Something to consider:

The old Equatorially mounted Newtonians were all pier mounted. There is good reason for this. With a Newtonian on an EQ mount, the mirror end of the tube and a tripod often want to be occupying the same space... this happens much less frequently with a pier.

Also, tripods achieve their stability by having their legs widely spread, this requires that the mount itself be higher than is optimal. To keep from being tippy, the legs must be spread wide. With a pier, the stability comes from the arms and not the triangulated height so the mount can be at the optimal height for observing.

I just don't see a need for a heavy mount for a 18 lbs 6 inch F/8 OTA.

Jon



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moynihan
Carpal Tunnel


Reged: 07/22/03

Loc: Lake Michigan Watershed
Re: GEM for 6" f/8 Newt new [Re: Jon Isaacs]
      #5792479 - 04/11/13 02:17 PM

Quote:

The old Equatorially mounted Newtonians were all pier mounted. There is good reason for this. ...





Indeed there is good reason for it. I have wondered about that approach, now. Orion (U.S.A.) used to offer mounting piers, as did Antares. I am not aware of a modern source, other than on the used market. Are you aware of any?


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Patrick
Postmaster
*****

Reged: 05/16/03

Loc: Franklin, Ohio
Re: GEM for 6" f/8 Newt new [Re: moynihan]
      #5792698 - 04/11/13 04:12 PM

I used a 6" f/8 Orion Newt for a couple of years mounted on a CG5-GT mount. I'd give it an 8 out of 10 for stability. Right now you can pick up a new CG-5 for under $600.

Patrick


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hottr6
Carpal Tunnel
*****

Reged: 06/28/09

Loc: 7,500', Magdalena Mtns, NM
Re: GEM for 6" f/8 Newt new [Re: moynihan]
      #5792914 - 04/11/13 05:24 PM

You can pick up old Starfinder pier-mounted GEMS for $100-200. A 6" f/8 would be rock solid on that mount.

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