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Equipment Discussions >> Mounts

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PhilCo126
Post Laureate


Reged: 01/14/05

Loc: coastline of Belgium
Which mount for large refractor ?
      #4574616 - 05/11/11 05:03 AM

We're trying to find out which mount to use to hold a 20 kilograms refractor for a small observatory ( outreach observational use, occasional astro-photography )... without getting under-mounted
Losmandy G-11 can hold 35 kg
CGE-Pro can hold 45 kg


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gillmj24
Post Laureate
*****

Reged: 12/06/05

Loc: PA
Re: Which mount for large refractor ? new [Re: PhilCo126]
      #4574743 - 05/11/11 07:44 AM

A large refractor needs substantially more mount than the equivalent weight (or even a heavier) short tube SCT.

I've seen a C14 on a G 11 but I wouldnt put a 50 pound "large" (meaning long) refractor on one.


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Eddgie
Postmaster
*****

Reged: 02/01/06

Re: Which mount for large refractor ? new [Re: PhilCo126]
      #4574868 - 05/11/11 09:20 AM

Losmandy Titan or something similar at the LEAST.

Not even sure the Titan will hold a 20 KG refractor still even though it is rated at 50KG load.

Some depends on the length of the refractor you are mounting.

If it is much more than a couple of meters long, you will most likely need a steel pier.

Titan would likely be your best bet though if you are cost concious.


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alpal
Post Laureate


Reged: 06/15/09

Loc: Melbourne Australia.
Re: Which mount for large refractor ? new [Re: Eddgie]
      #4574878 - 05/11/11 09:26 AM

What is the focal length of this refractor
& the diameter of the objective?


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David PavlichAdministrator
Transmographied
*****

Reged: 05/18/05

Loc: Mandeville, LA USA
Re: Which mount for large refractor ? new [Re: Eddgie]
      #4574881 - 05/11/11 09:27 AM

Quote:

Losmandy Titan or something similar at the LEAST.

Not even sure the Titan will hold a 20 KG refractor still even though it is rated at 50KG load.

Some depends on the length of the refractor you are mounting.

If it is much more than a couple of meters long, you will most likely need a steel pier.

Titan would likely be your best bet though if you are cost concious.




I don't know...a Tak TOA150 is around 40-45lbs and I wouldn't hesitate to put it on my MI250.

David


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M13 Observer
scholastic sledgehammer


Reged: 12/09/06

Re: Which mount for large refractor ? new [Re: PhilCo126]
      #4574979 - 05/11/11 10:22 AM

Quote:

We're trying to find out which mount to use to hold a 20 kilograms refractor for a small observatory ( outreach observational use, occasional astro-photography )... without getting under-mounted
Losmandy G-11 can hold 35 kg
CGE-Pro can hold 45 kg




AP900 on a steel or concrete pier.


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Eddgie
Postmaster
*****

Reged: 02/01/06

Re: Which mount for large refractor ? new [Re: David Pavlich]
      #4575046 - 05/11/11 11:03 AM

Oh, I think the MI-250 would be a nice choice, but it is no longer made, and the cheapest MI mount available today is over $12000.

These mounts to me also kind of fall into the "Custom" mount catagory because often they are built to order.

The Titan is half the price and is generally available.

And for someone in Europe that will have to pay import duties on top of the purchase price, I think that the MI mount can be a pricy issue.

But the OP really didn't give any details other than weight, and no information on budget or anything.

So the only thing we can do is make unqualified noise. We really don't know what his requirements and budget are.


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PhilCo126
Post Laureate


Reged: 01/14/05

Loc: coastline of Belgium
Re: Which mount for large refractor ? new [Re: Eddgie]
      #4575419 - 05/11/11 02:11 PM

sorry, for those who didn't follow the refractor topic, it's about this large achromatic refractor:
Fraunhofer achromatic 203 mm / 1800 = f/8.8 (20 kilogram)

http://www.apm-telescopes.de/pro_info.php?id=47666&bildid=1651


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skybsd
Post Laureate
*****

Reged: 02/01/08

Re: Which mount for large refractor ? new [Re: PhilCo126]
      #4575502 - 05/11/11 02:54 PM

Quote:

sorry, for those who didn't follow the refractor topic, it's about this large achromatic refractor:
Fraunhofer achromatic 203 mm / 1800 = f/8.8 (20 kilogram)

http://www.apm-telescopes.de/pro_info.php?id=47666&bildid=1651




What is your budget?

Regards,

skybsd


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M13 Observer
scholastic sledgehammer


Reged: 12/09/06

Re: Which mount for large refractor ? new [Re: PhilCo126]
      #4575612 - 05/11/11 03:56 PM

Quote:

sorry, for those who didn't follow the refractor topic, it's about this large achromatic refractor:
Fraunhofer achromatic 203 mm / 1800 = f/8.8 (20 kilogram)

http://www.apm-telescopes.de/pro_info.php?id=47666&bildid=1651




1.8 metre?!? AP1200 or Paramount.


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gillmj24
Post Laureate
*****

Reged: 12/06/05

Loc: PA
Re: Which mount for large refractor ? new [Re: M13 Observer]
      #4575675 - 05/11/11 04:32 PM

"PS I forgot to say I don't want to spend more than $750 on the mount"

I love it when they say that


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alpal
Post Laureate


Reged: 06/15/09

Loc: Melbourne Australia.
Re: Which mount for large refractor ? new [Re: gillmj24]
      #4575960 - 05/11/11 07:12 PM

Quote:

"PS I forgot to say I don't want to spend more than $750 on the mount"

I love it when they say that




Where did Phil say that?
$750 ?????


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Eddgie
Postmaster
*****

Reged: 02/01/06

Re: Which mount for large refractor ? new [Re: PhilCo126]
      #4576072 - 05/11/11 08:09 PM

Well, some of the pictues in the links you sent show them on a CGE.

If it were on a sturdy pier, maybe a CGE or G11 head would work.

Being in a dome would mean that you don't have as much issue with wind.


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wz2
Most Boring Astronomer...


Reged: 07/30/10

Re: Which mount for large refractor ? new [Re: Eddgie]
      #4576180 - 05/11/11 09:16 PM

AP-3600

"I say we nuke the entire site from orbit - it's the only way to be sure"

Chris


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alpal
Post Laureate


Reged: 06/15/09

Loc: Melbourne Australia.
Re: Which mount for large refractor ? new [Re: wz2]
      #4576281 - 05/11/11 10:02 PM

Quote:

AP-3600

"I say we nuke the entire site from orbit - it's the only way to be sure"

Chris




Yes the AP 3600 would definetly work but
at $26,000 it might be above their budget.

see my thread:
http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/4567958/page/1/view/collapsed/sb/5/o/all/fpart/1


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gillmj24
Post Laureate
*****

Reged: 12/06/05

Loc: PA
Re: Which mount for large refractor ? new [Re: alpal]
      #4576309 - 05/11/11 10:13 PM

Phil didn't say that but there's often threads about I want to do this that and everything else and not pay more than ____

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alpal
Post Laureate


Reged: 06/15/09

Loc: Melbourne Australia.
Re: Which mount for large refractor ? new [Re: gillmj24]
      #4576455 - 05/11/11 11:34 PM

Quote:

Phil didn't say that but there's often threads about I want to do this that and everything else and not pay more than ____




I spoke to a well known astronomer here in Melbourne
who claims he once made his own mount (30 years ago)
with a washing machine motor to drive it.
He actually got it to track for 5 minute frames
using drift alignment & no guiding.
It cost him almost nothing as he had a machine shop
to build it in.


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AntarcticDave
sage


Reged: 02/03/09

Loc: Denver, CO
Re: Which mount for large refractor ? new [Re: alpal]
      #4577343 - 05/12/11 12:58 PM

If you don't need a GOTO mount you might consider an Optic-Craft mount - something like a model 5 would most likely suffice.
http://www.opticcraft.com/telescopemounts.html


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PhilCo126
Post Laureate


Reged: 01/14/05

Loc: coastline of Belgium
Re: Which mount for large refractor ? new [Re: AntarcticDave]
      #4581473 - 05/14/11 02:00 PM

Budget would be about US $ 7500.00

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skybsd
Post Laureate
*****

Reged: 02/01/08

Re: Which mount for large refractor ? new [Re: PhilCo126]
      #4581514 - 05/14/11 02:29 PM

Hello,
Good to hear from you again..,

Quote:

Budget would be about US $ 7500.00




At your required payload, usage and FL (not to mention that you're in the EU), let's be honest here.., that's tight.

As far as brand new is concerned the only option open to you at this time, is the Gemini G42 . On the bright side, this is the same mount pictured with your OTA at APM .

Used.., well, at present there are a few options - at a glance: -

Very Best Option
Next Best Option
In Europe
MI-250
Losmandy GM-150

Hope that helps..,

Regards,

skybsd


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