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Equipment Discussions >> Mounts

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Tim A.
Pooh-Bah
*****

Reged: 09/19/07

Loc: 40 30'N 105 3'W
Alt-az for a big ol' refractor?
      #4524736 - 04/17/11 06:20 PM

My 6" refractor doesn't get as much use as I'd like, and that's on account of the CG-5GT mount. It's just enough for this big boy, but it is enough. The real issue is that as a rule I don't care for GEMs; too much hoo-hah per ah-ha! AP is not in the picture (pun intended); I'm a purely visual observer and I'd like a fast setup for this lovely cannon.

But with the OTA at 18.5 lbs., most alt-az mounts I've looked at just don't pack it (literally).

The Astro-Tech Voyager is spec'd "up to 20 pounds" (which is pretty much what the CG-5 is spec'd at). But I wonder if it'd really survive at that load.

Anyway, I'm sure I haven't seen everything out there. If anyone knows of an alt-az mount that would carry this big ... I'll go with "big 'ol", though I generally use a more colorful term ... refractor, I'd sure like to hear about it!


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mistyridge
Post Laureate
*****

Reged: 10/28/05

Loc: Loomis, CA
Re: Alt-az for a big ol' refractor? new [Re: Tim A.]
      #4524789 - 04/17/11 06:42 PM

The DiscMount DM-6 will carry your yard cannon easily.

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Midnight Dan
Postmaster
*****

Reged: 01/23/08

Loc: Hilton, NY, Yellow Zone (Bortl...
Re: Alt-az for a big ol' refractor? new [Re: mistyridge]
      #4524835 - 04/17/11 07:10 PM

Quote:

too much hoo-hah per ah-ha!




Can't help you, but I'm DEFINITELY stealing this for my list of sayings!

-Dan


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Ira
Carpal Tunnel
*****

Reged: 08/22/10

Loc: Mitzpe Ramon, Israel
Re: Alt-az for a big ol' refractor? new [Re: Midnight Dan]
      #4524854 - 04/17/11 07:18 PM

Get the T-Rex:
http://www.kkohki.com/English/T-REXmount.html

/Ira


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mountain monk
Carpal Tunnel
*****

Reged: 11/06/09

Loc: Grand Teton National Park
Re: Alt-az for a big ol' refractor? new [Re: Ira]
      #4524885 - 04/17/11 07:30 PM

Tim,

I have the DM-6 and love it and certainly think it would handle your cannon. The DiscMount site has lots of photographs showing big, heavy refractors mounted on the DM-6. Like all alt-azs, it is difficult at the zenith. The long, offset handle helps a lot--assuming the tripod does not interfere with it. Peters is a great guy to work with. Expensive? Yes. I don't know of a cheap solution. The T-Rex is also quite expensive.

Dark skies.

mm


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Tim A.
Pooh-Bah
*****

Reged: 09/19/07

Loc: 40 30'N 105 3'W
Re: Alt-az for a big ol' refractor? new [Re: mountain monk]
      #4524953 - 04/17/11 08:00 PM

Quote:

I have the DM-6 and love it ... Expensive? Yes. The T-Rex is also quite expensive. I don't know of a cheap solution.



Yeah, I've been noticing that ...

I may just have to bear the GEM (literally), until I find a used "mega-altaz".


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John Huntley
scholastic sledgehammer
*****

Reged: 07/16/06

Loc: South West England
Re: Alt-az for a big ol' refractor? new [Re: Tim A.]
      #4525030 - 04/17/11 08:35 PM Attachment (43 downloads)

I use a Giro-type mount for my 6" yard cannon. With a set of vibration suppression pads and CG5 tripod plus 16" pillar it does the job quite well and is simplicity itself to use (sorry it's not a great photo):

Edited by John Huntley (04/17/11 08:37 PM)


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CharlieB
Carpal Tunnel
*****

Reged: 12/11/07

Loc: Southern NH
Re: Alt-az for a big ol' refractor? new [Re: Tim A.]
      #4525087 - 04/17/11 09:02 PM

I second the Giro mount. I just picked up a Giro-3 and it comfortably carries my 6" AND 5" refractors at the same time. A great mount!

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Jeff Morgan
Postmaster
*****

Reged: 09/28/03

Loc: Prescott, AZ
Re: Alt-az for a big ol' refractor? new [Re: Tim A.]
      #4525143 - 04/17/11 09:32 PM

There are some nicely machined high-dollar alt-az mounts to be had. However, Richard Berry has your answer for a lot less money. The alt-az mount published in his book "Build Your Own Telescope" is designed for a 6" f/15 and very robust.

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izar187
Carpal Tunnel


Reged: 09/02/06

Loc: 43N
Re: Alt-az for a big ol' refractor? new [Re: Jeff Morgan]
      #4525235 - 04/17/11 10:26 PM

Look here perhaps:

http://www.google.com/search?client=safari&rls=en&q=berry+refractor+mount&ie=UTF-8&oe=UTF-8


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george tatsis
professor emeritus
*****

Reged: 11/20/08

Loc: Long Island, NY - Europe
Re: Alt-az for a big ol' refractor? new [Re: Tim A.]
      #4525567 - 04/18/11 02:40 AM

I second the Giro mount too. I used to have my 10" Orion Newt mounted on it. In a word ,excellent!!!

George


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GlenM
Vendor - Lyra Optic


Reged: 05/20/07

Loc: Lancashire England
Re: Alt-az for a big ol' refractor? new [Re: george tatsis]
      #4526162 - 04/18/11 11:41 AM Attachment (43 downloads)

Yes, the Giro III is an excellent mount.

I had one on a Losmandy G11 tripod with a 35lbs OTA on it,no problem.


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Krish Mandal
sage
*****

Reged: 09/02/09

Loc: Forest Hills, NY
Re: Alt-az for a big ol' refractor? new [Re: GlenM]
      #4526793 - 04/18/11 04:10 PM

Glen that is a sweeeeet lookin' scope my friend. I'm not normally a fan of silvery bodies on a telescope but that one is the bees knees!

For those who have recommended the GIRO mount, where in the US is it sold? I only see the EU distributors come up when I Google it.

Thanks.


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GlenM
Vendor - Lyra Optic


Reged: 05/20/07

Loc: Lancashire England
Re: Alt-az for a big ol' refractor? new [Re: Krish Mandal]
      #4526813 - 04/18/11 04:16 PM

Thanks Krish.

It used to cool down real quick
Polished Aluminium is the way to go for excellent emissivity.

Not seen any actual dealers in the US for the Giro III,must be one somewhere I suppose.


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dscarpa
Post Laureate
*****

Reged: 03/15/08

Loc: San Diego Ca.
Re: Alt-az for a big ol' refractor? new [Re: Tim A.]
      #4526821 - 04/18/11 04:18 PM

That scope would be way too much for my Voyager on a Oberwerk tripod, it's very good with WO ZS110. I have my C9.25- it's as heavy as a stock C11- on a Giro with a Sokkia tripod. It's stable, damps well and tracking is easy even at high power. I think the whole rig with shaft, weights, tray ect. was around $750. David

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george tatsis
professor emeritus
*****

Reged: 11/20/08

Loc: Long Island, NY - Europe
Re: Alt-az for a big ol' refractor? new [Re: Krish Mandal]
      #4526868 - 04/18/11 04:35 PM

Here you are Krish,

http://www.tech2000astronomy.com/

George


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Krish Mandal
sage
*****

Reged: 09/02/09

Loc: Forest Hills, NY
Re: Alt-az for a big ol' refractor? new [Re: george tatsis]
      #4528065 - 04/19/11 12:37 AM

George, thanks for the link. I've been there before, but don't know why I never noticed they sell the Giro mount. Maybe because I wasn't actively looking for an alt-az at the time.

'preciate it!


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dscarpa
Post Laureate
*****

Reged: 03/15/08

Loc: San Diego Ca.
Re: Alt-az for a big ol' refractor? new [Re: Tim A.]
      #4528667 - 04/19/11 10:31 AM

There is a new post here about the Giro 3 no longer being avalable in North America. I got mine from Teton which is MIA. OPT has a Giro clone from Expore Scientific. It goes for $400 with a 2" steel tripod. It looked heavy duty to me. David

Edited by dscarpa (04/19/11 10:34 AM)


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Doug Reilly
professor emeritus
*****

Reged: 07/29/08

Re: Alt-az for a big ol' refractor? new [Re: dscarpa]
      #4528696 - 04/19/11 10:43 AM

You might also look at the M7 by Stellarvue or the upcoming Super Half-Hitch...both would handle that on a good tripod. I've used and reviewed the Half-Hitch Mark II and it was superb, the "Super" is designed for bigger scopes. It holds a lot with less brute force than the others. The DM6 would be very nice, too. Tom Peters had a very large refractor on one at NEAF this weekend and it held it very, very nicely. Those are all pricier by far than a GIRO 3 or the ES mount built on the same principles. Don't have any experience with them.

BTW, I think Teton is more KIA than MIA. Mark is thinking about his next steps, last I heard.


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jason_milani
Carpal Tunnel
*****

Reged: 09/03/04

Loc: Northeast Ohio
Re: Alt-az for a big ol' refractor? new [Re: Doug Reilly]
      #4528841 - 04/19/11 11:33 AM

I put my 6" achro on a Unistar Deluxe. Handled it just fine using a beefy tripod. Not so well with an Oberwerk surveyor tripod but i think that would be the case with any mount. The Unistar is priced very competitively.

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lionel
sage


Reged: 08/12/07

Loc: Delaware
Re: Alt-az for a big ol' refractor? new [Re: jason_milani]
      #4533116 - 04/20/11 11:43 PM

I just picked up a Unistar Deluxe at NEAF for 20% off. I'm hopeful that it will do the job for my SV130EDT which is 38" long and weighs ~23 lb decked out.

I bought an extra adapter so that the mount can use any of my three tripods including a Celestron with 2" SS legs, a Vixen HAL 130 and an older Meade Standard Field tripod.

I also expect the Unistar will easily carry my Mewlon 250 since Larry displayed a C14 and a Meade 10 mounted together on his dual head Unistar.

Lionel


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Krish Mandal
sage
*****

Reged: 09/02/09

Loc: Forest Hills, NY
Re: Alt-az for a big ol' refractor? new [Re: lionel]
      #4534066 - 04/21/11 11:31 AM

In this same vein, given the choice between a WO EZ Touch and a SV MG2, which is the better mount for something as heavy as an AT90 + AT RACI on one side, and the possibility of an 8" SCT on the other?

I realize saying SCT may get me ejected from here, since the question is about mounting a "big ol' refractor" but I figured an AT90 on one side gets me a pass.



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Startraffic
professor emeritus
*****

Reged: 02/12/06

Loc: Lat. 39.143345, Long. -77.1748...
Re: Alt-az for a big ol' refractor? new [Re: Krish Mandal]
      #4534512 - 04/21/11 02:29 PM

Tim,
How about these? http://www.opticcraft.com/ if they aren't big enough then I give up.

StarT.


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Krish Mandal
sage
*****

Reged: 09/02/09

Loc: Forest Hills, NY
Re: Alt-az for a big ol' refractor? new [Re: Startraffic]
      #4534583 - 04/21/11 03:00 PM

Those OpticCraft mounts only seem to be EQ, right? They look really hefty ... a bit ugly maybe, but with a neat, industrial sort of charm.

I guess you can configure it to be AltAz but I would think that's too much work. I would guess the reason the OP would want AltAz would be some kind of quick setup as one of the factors.


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Doug76
Long Achro Junkie
*****

Reged: 12/05/07

Loc: Refractor Heaven
Re: Alt-az for a big ol' refractor? new [Re: Krish Mandal]
      #4534747 - 04/21/11 04:01 PM Attachment (19 downloads)

Frankly, were I looking to alt-az mount my C6R, I'd just build a bigger version of this pipe mount I made for my 60mm some time back.
Very strong, quite smooth, and much cheaper!


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jmiele
Patron Saint?
*****

Reged: 12/04/10

Re: Alt-az for a big ol' refractor? new [Re: Doug76]
      #4534801 - 04/21/11 04:25 PM

Nice Doug. Smarts and looks..
Joe


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