Posted 29 September 2012 - 10:45 AM
But the alignment must be dead on because it simply will not autoguide in declination. Backlash, box rubbing up against the knob, etc.
So, if I'm happy with weight of my kit on the CG5 but wanted a mount that could move better in declination and autoguide in declination, what should I look at?
Orion Sirius? Atlas? CGEM? Something I'm not thinking about?
Posted 29 September 2012 - 02:19 PM
I am a relative newbie at auto guiding, but if you are using PHD does it perform the calibration in Dec? Are you using a GPSUSB and can you check the Dec in the GPSCheck program to confirm your st4 cable is functional? If you are well polar aligned, the autoguider will mostly never need to use Dec anyhow, so maybe it's that reason? When you say it's rubbing, have you tried the other side of the meridian or just a target where the motor box does not touch the mount itself?
Posted 29 September 2012 - 04:17 PM
Would like a better method but it's what I've got.
Posted 29 September 2012 - 04:27 PM
Posted 01 October 2012 - 09:22 AM
Posted 01 October 2012 - 10:37 PM
Don't get a Sirius. Your scope will be pushing it to its limits for AP. Try the Atlas instead. Get the ASCOM platform, EQMOD, PhD, and CdC and you;ll have a full set of free software to run the mount. CdC will also use the HGS (Hubble Guide Star) catalog if you need to see faint stars in your planetarium program.
Why the Sirius cannot handle a C8? The weight capacity of the mount is 30lbs, and the C8 is just 12.5 pounds. Adding a camera and a small guide scope should not add too much weight. I would not recommend shooting unguided at f/10,but with guiding I think the mount can handle the job very well.
Posted 02 October 2012 - 09:25 AM
Posted 02 October 2012 - 09:49 AM
I see the mount about a sturdier mount is better.
But, right now, the CG5 handles what I put on it fine - the Dec problem is there even when all I have on the mount is an ST80 and camera (with finder guider). I have gotten good images, retaining 90% of my subs, with the C8 at f/10 so long as my alignment is good enough to not drift in Dec.
Also, I don't have a permanent setup, so I have to move the mount out of the garage with each use and then align. So, heavier isn't necessarily better. I'm open to the idea that the Sirius isn't good enough but I'm not clear that a C8, finder/guider (at f/6.3) and camera is too much for it.
But, if it is Atlas or CGEM, which? I read enough stories about the CGEM to be cautious, but I know the Celestron systems and have plates, etc. for it. And stories can be misleading.
Posted 02 October 2012 - 10:02 AM
My personal preference is for the CGEM due to the Nexstar hand controller and to the physical improvements made to the mount compared to the Atlas. Being familiar with the Nexstar, you would find the CGEM much easier to use right off the bat, but you would adjust to the Synscan or EQMOD without too much trouble. There are a lot of opinions between the two mounts, but I would say that overall it is fairly well split.
Posted 02 October 2012 - 10:14 AM