· Get a Cloudy Nights T-Shirt · Submit a Review / Article Click here if you are having trouble logging into the forums Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> Mounts Previous   Index   Next   Threaded   Pages: 1 Jimmy2K63 Carpal Tunnel Reged: 04/26/09 Loc: Milky Way, Spiral Arm, G2 Star... GoTo mount for classic OTA - Help!       #3078602 - 05/01/09 09:11 AM Edit   Reply   Quote Quick Reply   I am considering the purchase of a GoTo mount for my Cave 10" f/5 OTA. I've considered adding GoTo to my existing Astrola mount as well, but I sure like the idea of a whole new mount with a simple hand controller and a tripod for portability....such as the CG-5. :-) Or perhaps a simple GoTo Dobsonian mount would suffice as well. At this point, the important thing is the ability to slew and allow visual astronomy to be performed with it. The original Astrola mount is extremely stable and completely amazing as an observatory mount, but that's not what I am after. I'd like to hear what others have done with larger newtonians and GoTo and help get pointed in the right direction - no pun intended. Post Extras:       tim53 Postmaster Reged: 12/17/04 Loc: Highland Park, CA Re: GoTo mount for classic OTA - Help! [Re: Jimmy2K63]       #3078624 - 05/01/09 09:23 AM Edit   Reply   Quote Quick Reply   I would think that the Cave OTA would crush a cg-5 into the dust! With a full-thickness mirror and fiberglass tube, it's nothing like the lightweight OTAs that Celestron and others put on those mounts - which are underkill themselves, IMHO. You might look at a Sidereal Technology goto servo kit for the Astrola mount. You can do it yourself for about $800, or pay to have it done by someone like Lenord Stage at gototelescopes.com. I think his website even has a pic of a converted Cave mount. Please don't make a dob out of a Cave. Somehow that seems wrong to me (seriously, do what you want, I'm just ranting! ) -Tim. Post Extras:       Jimmy2K63 Carpal Tunnel Reged: 04/26/09 Loc: Milky Way, Spiral Arm, G2 Star... Re: GoTo mount for classic OTA - Help! [Re: tim53]       #3078634 - 05/01/09 09:29 AM Edit   Reply   Quote Quick Reply   Thanks Tim. I did email Leonard and am waiting to hear from him STILL. For the price of converting it, I can buy a GoTo portable scope. Still would be nice to have these optics on a GoTo mount. At least I know what the OTA is capable of. No I don't want to make this into a Dob, but if I could get a Dob mount for this OTA I could still also use it on the GEM at home, the Dob out on "the road." Post Extras:       Charlie Hein Postmaster Reged: 11/02/03 Loc: 26.06.08N, +80.23.08W Re: GoTo mount for classic OTA - Help! [Re: Jimmy2K63]       #3078641 - 05/01/09 09:35 AM Edit   Reply   Quote Quick Reply   Would installing DSC's be an opption here? It's not Go-to but you would be able to locate objects easily. Post Extras:       tim53 Postmaster Reged: 12/17/04 Loc: Highland Park, CA Re: GoTo mount for classic OTA - Help! [Re: Charlie Hein]       #3078678 - 05/01/09 09:58 AM Edit   Reply   Quote Quick Reply   you can also do quite well with the stock setting circles. Most people don't even think of this option. Cheap, too! -Tim. Post Extras:       Quintessence Vendor Reged: 06/03/07 Loc: Austin, Texas Re: GoTo mount for classic OTA - Help! [Re: Charlie Hein]       #3078684 - 05/01/09 10:03 AM Edit   Reply   Quote Quick Reply   I agree with Charlie. I think a good DSC installation is a practical idea that will not destroy the character of the original mount and telescope -- and will allow you to find just as many objects with essentially the same speed and ease of a GOTO mount, probably with more reliability, less maintenance, less noise, and less cost. To me, this is a no-brainer. Post Extras:       Jimmy2K63 Carpal Tunnel Reged: 04/26/09 Loc: Milky Way, Spiral Arm, G2 Star... Re: GoTo mount for classic OTA - Help! [Re: Quintessence]       #3078699 - 05/01/09 10:10 AM Edit   Reply   Quote Quick Reply   Setting circles are only accurate if the scope is precisely polar aligned are they not? That's not real practical for a portable usage situation. Do the DSC's allow you to "compensate" for a lack of precise polar alignment? Post Extras:       tim53 Postmaster Reged: 12/17/04 Loc: Highland Park, CA Re: GoTo mount for classic OTA - Help! [Re: Jimmy2K63]       #3078764 - 05/01/09 10:49 AM Edit   Reply   Quote Quick Reply   You can do pretty well by pointing the OTA to 90 degs declination and adjusting the mount to put Polaris in line with the OTA by just sighting up the tube at the star. I used to do this with my old Optical Craftsmen Discoverer mount (which has much smaller setting circles than the cave), and objects were always in the finder field of view when I used the setting circles. -Tim. Post Extras:       Quintessence Vendor Reged: 06/03/07 Loc: Austin, Texas Re: GoTo mount for classic OTA - Help! [Re: Jimmy2K63]       #3078989 - 05/01/09 12:50 PM Edit   Reply   Quote Quick Reply   With two-star alignment, DSC units compensate for poor polar alignment. As far as pointing is concerned, GOTO mounts have no advantage over DSC aiming. Pointing accuracy is generally a function of factors like orthogonality of the axes, precession in the axes, sag in the mechanical structures, encoder resolution, concentricity of the encoders with respect to the axes, and other such geometric issues. Post Extras:       jgraham Postmaster Reged: 12/02/04 Loc: Dayton, Ohio Re: GoTo mount for classic OTA - Help! [Re: Quintessence]       #3079886 - 05/01/09 09:06 PM Attachment (25 downloads) Edit   Reply   Quote Quick Reply   It can be done, but I suspect the weight would be a problem. If you're going to try this be sure the weight of your telescope is within the weight limits of the mount. This is my homebuilt 8" f/6 Newtonian on my LXD75. I also built a lightweight 10" f/5.6 specifically for this mount, but I haven't tried it yet; it just looks to big for the mount. Post Extras:       Project Galileo professor emeritus Reged: 11/14/07 Loc: Jefferson County, Colorado Re: GoTo mount for classic OTA - Help! [Re: jgraham]       #3080009 - 05/01/09 10:24 PM Edit   Reply   Quote Quick Reply   Cool rig. Post Extras:       Chris Curran scholastic sledgehammer Reged: 06/14/05 Loc: Brandon, FL Re: GoTo mount for classic OTA - Help! [Re: Jimmy2K63]       #3080437 - 05/02/09 06:42 AM Edit   Reply   Quote Quick Reply   Jimmy, As many have mentioned, the least expensive route you can take is to upgrade the electronics on your current mount. However, if you're planning up buying a new mount, a CG5 won't do it. I have a 10" f/6. On the Tak EM-200 mount it is barely usable for visual use. It works, but is wobbly: When I slap it on the 1200, it's quite usable: Big newts like big mounts. You're probably better off just upgrading your current mount, unless you're ready to fork out some serious cash... Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 13 registered and 28 anonymous users are browsing this forum. 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