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Hi~~ :

I am going to make a Newtonian D=305mm,F=4,and make the tube with aluminium alloy [No. #6063]. Then its weight will be about 22kg.[includes dovetail;tube holders; guidingscope;etc.. all miscellaneousness]

At the beginning I want to use Vixen's NEW ATLUX, but its preload is just about 22kg! Then I think of CGE & CGE Pro.

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Hi~~ :

I am going to make a Newtonian D=305mm,F=4,and make the tube with aluminium alloy [No. #6063]. Then its weight will be about 22kg.[includes dovetail;tube holders; guidingscope;etc.. all miscellaneousness]

At the beginning I want to use Vixen's NEW ATLUX, but its preload is just about 22kg! Then I think of CGE & CGE Pro.

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The Altux is rated for a load of 75 lb./34 kg:

http://www.vixenoptics.com/mounts/atlux.htm

If you want more load capacity in a Vixen mount, then get the Gaiax which is rated for a load of 100 lb./45 kg:

http://www.vixenoptics.com/mounts/gaiax.html

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I was going to say the same thing , the Atlux is build like a tank ....

You'd have no problem mounting a 12" f4 newt onto a New Atlux , I reckon you'd probably be able mount a RF newt up to 15" on one without overloading it .... unlike some companies GEMs I think Vixen is very concervative on max loading capabilities on their GEMs , they have are overengineered.

You'll likely find a Vixen New Atlux will out perform any off the shelf Celestron or Losmandy GEM of comparable size.
This is why I bought mine.

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Thank you! GaryML & others. But please have a look at this address-----http://www.vixen.co.jp/English/at/spec/atlux_e.html
I have ever sent an E-MAIL to Vixen's Japanese company, and their answer is just 22kg! not 35kg~~~

The tube is about 1200mm long. If I increase the length of the dovetail and the distance between the 2 tube holders, will this decrease the vibrance of the tube?

Have a look at my draw.

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Hi~~ :

I am going to make a Newtonian D=305mm,F=4,and make the tube with aluminium alloy [No. #6063]. Then its weight will be about 22kg.[includes dovetail;tube holders; guidingscope;etc.. all miscellaneousness]

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Dear Bowmoreman,

Thank you VERY MUCH for so much useful help & advice!

Now I am still a bit sad...... you know, I want to do both visual & AP, and i do know that the aperture of a telescope is such important for watching much more faint objects.

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I ONLY have 30000 RMB, equal to 3750 dollars, this sum of money is the budget for me to buy a good mount that I can afford. Those famous brands, such as ME,AP,TAKAHASHI etc., for me are so expensive~~~~ And I have no my own car,but my good friends are to buy a car recently, we have no dome, usually, we are going to observe in wild mountain regions.

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http://www.telescopeplanet.co.uk/ViewProdDetails.asp?prod_code=PON08F000001
So have a look at this, I think that this telescope is only for visual, not very suitable for AP maybe, is it right???

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I have found the homepage of MI 250. wow!!! 7000dollars~~~ for me it is ABSOLUTELY an astronomical number!!! And this do not include necessories~~~

How shall I do????

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Not to worry!

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I list a form bellow:
1). mirror: net diameter=305mm; thickness=38mm; net weight=6kg
2). mirror cell: aluminium, net weight=2.4kg. it has 9 points of nylon support, 3 screws are for push and 3 for pull
3). the tube: #6063 aluminium alloy, density is 2.7g/cm3; thickness=2mm; I give up both up cover and rear cover.
4). focuser: 1.25''
5). ORION's SSDS, about 500g; or Nikon FA camera body + lens + teleconvertor + flip mirror, etc...... other necessories-----1kg
6). secondary mirror + spider: about 600g
7). guidingscope + support: about 2kg
8). dovetail board: #6063 aluminium alloy, thickness=2~3cm; tube rings. All are about 3~4kg

It is said that CGE's maxload is 65 pound, about 29kg. So Bowmoreman, Why do you say that CGE is not suitable for my Newtonian? I do not understand,yet.

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I do want to buy C14~~~ but it is too expensive

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AND ESPECIALLY I FIND A STRANGE THING:

At Celestron's homepage, all mounts' spec give their max loading, such as CGEM; CGE Pro; CG5. BUT IT IS CGE that has no this item!!!

WHY DOES CELESTRON DO LIKE THIS???????? WHY DOES CELESTRON HIDE THIS FROM US???

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Can't say. My experience with Celestron and virtually every other mount maker other than Vixen (America - not Japan!) is that they rate the load as the "LOAD" and do NOT consider CW's as "Load"...

Now, why Celestron no longer talk about the load capacity of the CGE??? Don't know. Not to worry. It is, in my direct, and may other's experiences, quite capable of loads up to to the 55-65# or more (not including CWs).

Careful balance is the key. As low a center of gravity as possible (for the load) is key. As minimal moment arm of the load as possible is the key.

Believe me, a CGE is "just about" at the limit of "transportable" (at least for me!)... Anything bigger starts to get into the serious hassle to transport range...

Obviously, weight lifters, etc. may feel differently. But I wouldn't want to constantly be transporting a CGE Pro, AP900, MI250, Losmandy Titan, etc... on a frequent basis...

Ever lift just the tripod for something like a CGE?


Clear enough skies

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Then 65 pound for CGE.....

65 = 1. tube + CWs? or
2. ONLY tube & other necessories?

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