Posted 18 June 2013 - 07:44 PM
Posted 21 June 2013 - 11:39 PM
Posted 22 June 2013 - 12:15 AM
One thing that makes me nervous about the SE mount, what are the chances that the clamps loosen a little and the scope falls off the mount? I find myself retightening it after each night's viewing session lol.
There was a certain amount of security with the older, 8i/8i se mount, since the OTA could not be removed there was no chance of it falling off.
Posted 22 June 2013 - 04:09 AM
You can always stabilise your tripod assembly a little more by lowering its legs to a level still comfortable to your viewing and suspending weight from its central spreader. Such additional weight could be effected for example, via a power pack, sand bag, clinker building block etc. (I've even known some who have filled the legs with sand and, in one case with concrete...... a bit too drastic, I'm thinking) !
I understand anti-vibration pads can be very effective on concrete and wooden decking surfaces but less so if you intend to set up your 'scope on a grassed lawn or soft earth.
Just another thought, Donnie, you could additionally make use of a motorised focuser, in which case, you'll have no need to make manual contact with your 'scope and thus cause any significant vibration when focusing.
Posted 22 June 2013 - 05:26 AM
Tel's advise about an electric focuser is right on.
I built my own.
Here is the servo
Here is the controller.
Posted 22 June 2013 - 07:21 AM
Posted 22 June 2013 - 08:18 AM
Congrats on the 8SE! I have to agree with the others ... try some of the suggestions offered before deciding to abandon the SE mount in favor of the CG-5.
It is certainly true that the CG-5 is substantially more stable than the SE. But the SE mount offers a couple of very important factor over the CG-5 - portability and ease of setup. You'll find you'll use the scope more if it's easy to get it outside and start viewing quickly. The CG-5 is heavy, requires multiple trips including the OTA, needs to be polar aligned, and can put the OTA in some awkward positions for viewing.
By contrast, the 8SE can be left fully assemble on the tripod and taken outside as a whole. Set it on the ground, do a quick alignment, and you're ready to go. There's a lot to be said for that convenience!
Posted 22 June 2013 - 10:01 AM
Posted 22 June 2013 - 10:36 PM
Posted 23 June 2013 - 04:40 AM
To me, that was expensive. So I built my own. But if you aren't handy soldering, then the JMI focuser would be my first choice.
I would say that the OTA to mount is very secure. I have owned my 8SE since Feb and I have never had a fear of it coming off the mount. I just make sure the knob is tight when I mount the OTA.
Posted 23 June 2013 - 05:19 AM
Posted 23 June 2013 - 05:23 AM
Posted 23 June 2013 - 06:07 AM
Just make sure that the dovetail is fully seated into the jaws of the clamp and as Ben advises, check the knob each time before moving and it should be fine. I used my 8se fully assembled for over two years with no problems.
Posted 23 June 2013 - 06:27 AM
The problem comes however; certainly as far as I'm concerned; in ideally needing three hands: two to hold and position the OTA and one to tighten the clamp knob.
The potential hazards in removing and replacing the OTA are also compounded somewhat by the need to stand on the opposite side to the shoe, making "the fit" of the OTA's dovetail with the mount's dovetail shoe, difficult to see.
The answer ? Enlist the help of another; either to ensure correct dovetail positioning and then to tighten the clamp or, to hold and manoeuver the OTA while you attend to the shoe and clamp.
Hilde is, by now, well practised in the art !
Posted 23 June 2013 - 07:34 AM
Posted 23 June 2013 - 07:54 AM
Posted 23 June 2013 - 07:57 AM
Bet Hilde does the holding bit while you have the strenuous, and it has to be said, more technical task of tightening the clamp. :rofl2:
Was tempted, but I'm not even going to touch that one. Just use your imaginations.
Posted 23 June 2013 - 11:20 PM
there is something like a millimeter of space left between the OTA and the edge of the clamp...... I suppose this is alright?
Posted 24 June 2013 - 06:14 AM
Posted 25 June 2013 - 09:45 AM
Posted 25 June 2013 - 09:52 AM
The clamp just about bisects the rail...... there is about 3 mm of space between the clamp and the edge of the dovetail rail closest to the OTA.
Not sure I understand from your description. Can you provide a drawing or photo?
Posted 25 June 2013 - 11:46 PM