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Radim
member
Reged: 11/06/05
Posts: 73
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Guys, is there any alt-az mount with go-to, suitable for 11-14inch SCT? I like the simplicity and go-to comfort that for ex 8SE combo is giving  , I am thinking is there anything similar in bigger size?
Thanks
Radim
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OMC300 , SCT 8SE
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Rich N
Post Laureate
Reged: 09/22/04
Posts: 5562
Loc: San Francisco Bay Area, Calif...
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Celestron CPC 1100
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Eddgie
Carpal Tunnel
Reged: 02/01/06
Posts: 2703
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I have seen the Gyro (? Not sure if this is the correct spelling) used with a C11 on one side and a 6" refractor on the other side.
A Stellarvue M7 MIGHT come close too.
It is problematic though. It isn't that these big OTAs weigh so much, it is that they carry the center of gravity VERY far out from the dovetail as opposed to something like a 6" refractor that weighs the same amount.
Because of this, the pressure on the bearings is VERY assymetrical, causing a great deal of trouble getting the mount to move smoothly in azimuth.
I tried using a C8 on a very highly regarded Alt Az and even with the heavy duty mount, I found it a bit hard to get working smoothly in azimuth.
As a consquence, you may find that you NEED counterweights.
I personally think it will be a challange because not only are you putting the big assymetric load on the mount, you are also using a telescope that will work at a relativly high power (70X) as its LOWEST power. Any problems with motion will be badly aggrevated at the eyepiece.
It is a lot of telescoep for an Alt Az mount. M7 MIGHT work, but I doubt it.
Again, I DID see where a guy was using a C11 and a 6" APO as his counterweigth and I think the mount was a Gyro, so "it HAS been done." The only question now is if YOU want to do it too.. LOL.
good luck.
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Celestron C14, CGE (Big Al)
Astro-Physics 6" f/8 (Buffy)
Televue 101 (No name, but I call it my Widescreen HD Space TV)
The night sky is my mistress. She seduces me away from all other lovers.
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Eddgie
Carpal Tunnel
Reged: 02/01/06
Posts: 2703
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Sorry.. about 70x to 75x with a 41mm Pan. You could be using a 55mm Plossl though, but even with that you are talking 50x MINIMUM, and often, MUCH more than this.
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Celestron C14, CGE (Big Al)
Astro-Physics 6" f/8 (Buffy)
Televue 101 (No name, but I call it my Widescreen HD Space TV)
The night sky is my mistress. She seduces me away from all other lovers.
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mikee
professor emeritus
Reged: 01/10/05
Posts: 701
Loc: Maine
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I had a C8 on a DM-4 and found it to be not useable for my liking due to the narrow field of view, high powers that SCT general work at and the way the center of gravity was. Made making small adjustments extremely difficult. I almost always over-nudged 
But that might just have been me.
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Radim
member
Reged: 11/06/05
Posts: 73
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Thanks Eddgie, I took a look on Giro3 , seems to be interesting, but I am not sure if it has GO-TO and tracking option?
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OMC300 , SCT 8SE
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Lane
Carpal Tunnel
Reged: 11/19/07
Posts: 1513
Loc: Frisco, Texas
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Quote:
Celestron CPC 1100
This does seem like the best choice to me too.
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Mounts: CGEM, ORION SIRIUS, AT Voyager/motorized
SCTs: C6, C8, C9.25, C11,
Refractors: TV Pronto, Orion ED80
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Doc Bob
member
Reged: 02/27/09
Posts: 40
Loc: Maryland, USA
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I agree with Rich N and Lane. . . CPC1100 is the way to go! If you don't want to use the go-to features, just plug-in the power source and use the hand controller and slew the telescope wherever you want to go!
Regards,
Bob
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CPC1100 w/Stellarvue 2" dielectric diagonal
AstroTelescopes 80 mm f/6 w/Celestron 2" mirror diagonal
Stelarvue M1 mount
Axiom LX 10mm 1.25"; 19mm, 23mm, 31mm 2"
CELESTRON 40mm Plossl (came w/ scope) 1.25"
Meade 5000 series 14mm Plossl 1.25"
Pentax XW 7mm 1.25"
a really inexpensive 4mm 1.25"
GSO 2" Barlow 2x w/ 1.25" adaptor
To many 1.25" filters - use only 3
OIII 1.25"
Lumicon Deep Sky Filter - SCT thread
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Eddgie
Carpal Tunnel
Reged: 02/01/06
Posts: 2703
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Ah, my bad. I didn't get that Go-To was REQUIRED.
Yes, NexStar 11 or CPC 11 are the only choices in this catagory. Giro type mounts don't track.
Be warned that while the C11 OTA only weighs about 30 lbs. on a fork, the weight goes to 65 Lbs or 70. Lbs. Well packaged though, and moving one is not terribly difficult.
Sorry for my misunderstanding.
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Celestron C14, CGE (Big Al)
Astro-Physics 6" f/8 (Buffy)
Televue 101 (No name, but I call it my Widescreen HD Space TV)
The night sky is my mistress. She seduces me away from all other lovers.
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Tamiji Homma
Pooh-Bah
Reged: 02/24/07
Posts: 1089
Loc: California, USA
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I use DM-6 on Losmandy HD tripod with Vixen VMC260L when I don't want to bring G11 mount. Stability, go-to (SkyCommander) accuracy point of view, I am happy with the combo.
I would think C11 is OK but not sure with C14 on DM-6. C14 is probably borderline.
Tammy
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iluxo
journeyman
Reged: 09/23/08
Posts: 79
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http://www.apmamerica.com/index.php?main_page=product_info&cPath=49_58&products_id=100
They say suitable for 14" SCT and from the specs I'd believe it. The next problem is the tripod.
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~~~~~~~~~~~~~~~
180mm f/15 Mak
ED102 f/7
Vixen NLVW30, LVW22,13,8 and Vixen LV50, 25,15,10,6,4
TMB40mm
Masuyama 45mm
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Tamiji Homma
Pooh-Bah
Reged: 02/24/07
Posts: 1089
Loc: California, USA
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Another one to consider:
http://www.binoscope.com/bigbino.htm#altazmt
I am considering it for 6" binoscope.
Tammy
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