Posted 04 February 2013 - 08:17 PM
I've had some fun buying a little equipment for my imaging. I've now got my camera and my computer on a 12 volt supply - very exciting. I am now looking at autoguiding ... I sure envy the five minute or longer exposures people report.
I own a Celestron C6-SGT. I'm planning on purchasing an Orion SSAG, and was going to buy an 80 mm Celestron guide scope. I'm having second thoughts ... people talk about the extra weight and it seems a little troublesome to attach to my mount. I saw in an old post a mini-guide scope that seemed attractive (can't find it again, sorry). The person had the little guide scope on some kind of mount that clamped right to the orange dovetail bar that the telescope itself is mounted to. Pretty slick, it seems.
Thanks for getting through that ... a few questions, then -
Do folks like their 50 mm guide scopes more than an 80 mm, say?
If so, what kind of guide scope do people prefer? I'm talking something less than $200.
Does anyone know where the clamps/mounts that I am speaking of might be available? They sling a mini guide scope below the imaging tube.
Thanks for your help,
Posted 04 February 2013 - 09:37 PM
Here is a link to the ADM Accessories:
Posted 04 February 2013 - 09:38 PM
Posted 07 February 2013 - 06:39 PM
1.) your mount is going to constantly dissapoint you for AP. I've got a CG-5, which I believe is the mount you have with a C6-SGT. I've had very poor luck with this, going as far as trying another one which had the same problems. The new Advanced VX mount isn't all that pricey (if you sell off your CG-5 you can probably get $400-500 and that's more than halfway there), and will probably perform quite a bit better.
2.) whether or not you upgrade your mount, with a C6 tube you have a focal length of 1500 for a focal ration of f/10. If you keep using this scope, get a focal reducer. The celestron f/6.3 focal reducer will give you a wider field of view as well as allow you to take shorter exposures. I have an 8" f/10 sct (my tube is a meade, but its not radically different from the C8), and the focal reducer makes a HUGE difference.
3.) consider imaging through the 80mm scope. I've also got an 80mm f/4 refractor. It gives me wider fields (great for M42, M31, the rosette, and lots more) and less effect from the mount's tracking.
4.) You should be able to easily mount the orion autoguider package and stay well within your weight limit. I've used the 50mm scope for guiding with an atik 16c, and its a good little scope once you get it dialed in. Someone suggested it might be good for imaging M31... haven't tried that yet, but its definitely a MUCH lighter package than celestron's 80mm guiding package.
Last piece of advice: listen to the people who've been doing this a while... the best advice I've gotten has been from a guy in my club who does professional-quality imaging. I'm still fairly new, still figuring out what works... but every time he gives me some advice, I find myself moving a step further forward. I'm not there yet... but i'm getting there.
Posted 08 February 2013 - 09:24 AM
Here is an image I took last night using my 'finder-guider' with my ED80:
Yes, it's just mounted to the scope using the finder-shoe!