Show off your NexStar
Posted 18 September 2012 - 09:42 AM
Its actually a solar system chart for kiddies.
Posted 22 September 2012 - 12:29 PM
Might end up adding a green laser setup to the finderscope bracket of the ST-80.
Posted 08 October 2012 - 04:34 PM
Posted 10 October 2012 - 09:04 PM
Going to include 3 more shots for poster's request above hope it doesn't offend anyone. I should also add that obviously the extra weight is beyond the ability of one counterweight to compensate for. Can't really play with the new additions until I order another one (c'mon payday!)
Posted 10 October 2012 - 09:07 PM
Posted 10 October 2012 - 11:05 PM
Posted 11 October 2012 - 04:07 AM
I fear that this setup may be too heavy for f/10 AP. Have to try it out on f6.3 to be sure. I am loaded at about 19ish pounds which bypasses the rule of 1/2 load rating of mount for AP. Careful balancing and experimentation will eventually tell. I am convinced I am going to purchase the hyperstar setup here eventually, so at f/2 it should be good for I hope up to 2 minute or better subs (local LP makes anything longer problematic anyway).
I should also add that obviously the extra weight is beyond the ability of one counterweight to compensate for. Can't really play with the new additions until I order another one (c'mon payday!)
A few comments perhaps for what they're worth.
I operate a Skywatcher HEQ5 Pro GEM which I believe is the direct equivalent of your Sirius EQ-G, with a maximum, recommended payload of 16 Kg (35lbs).
This mount supports my Nexstar 8i OTA plus a 102mm (4") f/5.9 refractor together with an 8 X 50 finder, one 1.25" diagonal, one 2" diagonal and two CCD cameras (Atik 314L and Meade DSI). Alternatively, I can swap the Atik for a Canon 350D leaving the DSI which I use for guiding purposes when necessary and, should I choose merely to observe, I use relatively heavy Baader EPs.
Thus the total load at any one time on my HEQ5Pro is somewhere between ca. 68-72% of maximum and requires 3 X 5 Kg (11lbs) counterweights to balance.
I can say that having run this particular set up for well over a year now, I have had absolutely no problems with this payload or the accuracy of the GoTos, while tracking is very satisfactory, permitting about 2 minutes unguided from the 4" refractor and ca. 10 - 13 minutes guided, (the N8i being used for the guiding at f/5 via a focal reducer to give me a wider FOV and thus more guide star options).
I admit that I tend to use the refractor almost exclusively for DSO imaging and the N8i OTA for guiding, except for planetary work, in which case I operate the N8i unguided but can still hold a planetary image on my LT screen for at least 3 minutes at f/30 (X3 Barlow) before it begins to nudge the edge of the FOV.
I realise my view on what is tolerable as far as this mount is concerned, is controversal and others will have entirely different opinions on the subject, but I can only state with all honesty, what works for me.
With regard to the stability my set up enjoys, I would add that it is housed in a small observatory and sits on a fixed cast iron pier.
One last point on the subject of light pollution. If it's as severe as you suggest it is at your normal viewing venue, the use of Ha and Olll filters will get you around this; at least for emission nebulae imaging.
As mentioned, Andrew, just some ramblings which you may or may not find useful.
Posted 11 October 2012 - 10:10 AM
Posted 11 October 2012 - 09:25 PM
Posted 12 October 2012 - 02:17 PM
I like your setup. In fact, I will probably want to copy it by putting an ST80 or other refractor on my 6SE. Just curious, how did you attach the rail for your refractor rings to the SCT OTA?
Posted 12 October 2012 - 08:44 PM
I attached it with the celestron #92416 Losmandy-D rail available from celestron. I then used two astro-tech adapters to mount the rings on. I realize that the Los-D mount is a bit of overkill, but my thought was that it might have a bit of advantage over the ADM vixen dovetail/radius block combo when it comes to flexure as the celestron dovetail is a single piece of metal that is compatible with the bolt holes on the OTA instead of two blocks and a bar. Only downside is it is significantly heavier than the vixen rail. I have not been able to test it out yet due to needing another counterweight (and clouds are ever persistent the last 2 weeks). Just ordered the new counterweight this morning so hopefully I will get to test it soon.
Posted 22 October 2012 - 05:38 AM
Posted 22 October 2012 - 04:41 PM
Posted 22 October 2012 - 05:22 PM
Great set-up. You are certainly making the best of your avaiable space.
Posted 18 November 2012 - 03:35 PM
Posted 18 November 2012 - 04:39 PM
You ought to post that picture in the following thread: AP Images Taken with Original NexStar (this link takes you directly to the end of the thread).
Anyway, to housekeeping!
Let me be the first to welcome you to the NexStar forum
Posted 18 November 2012 - 07:03 PM
Welcome to CN and to this Nexstar forum !
All looking good, but I personally recommend you forget any thoughts of wedge mounting it.
The wedge designed for the 8SE was discontinued some time ago. I am unsure as to Celestron's reason(s) for this, but, having owned one myself, all I can say is that it didn't work with any reliabilty !
In the first instance, it was virtually impossible to get any degree of accuracy in polar alignment. Secondly, the 'scope was prone to some very inconsistent slew and tracking characteristics due to gravitational effects resulting from the various attitudes it had to assume, attributable to its attachment to the single tine of the mount. Thirdly, these anomalies were compounded by the inherent backlash present in the mount's drive.
This is not to say that the 8SE is incapable of any serious astro-imaging but at, the end of the day, unless equatorially aligned on an EQ mount designed for the job, such imaging will be limited to lunar, planetary and otherwise short exposure (30sec.) DSO photography; great examples of which are to be found on this Nexstar forum under the "AP Images Taken With Original Nexstar".
Posted 20 December 2012 - 09:12 PM
Posted 21 December 2012 - 04:23 AM
I trust Lola was eventually rewarded after all was packed away ?
Welcome to CN and to this forum, Jturie ! :bow:
I'm sure your going to enjoy those post Xmas skies with this great 'scope !
Posted 21 December 2012 - 09:10 AM
Posted 22 December 2012 - 06:28 PM