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Found 6 results

  1. Hello guys, I recently got into astronomy so I bought my first telescope. I've read through several articles and the recommendation for a beginner's telescope (value/price) was Celestron Astromaster 130EQ-MD. I bought this from someone who was not really using it and it is in a very good condition. Prior to actually purchasing this, I've watched countless videos on how the telescope works, what needs to be done - latitude, RA/DEC alignment, polar alignment, etc.. After reading through all available manuals and videos, I finally brought it home from the seller (they've had it for around 5 years but it wasn't used much). After setting up the tripod, mounting the telescope and familiarising myself with all the different knobs, I pointed the mount/telescope towards north. The first thing I had to do was setting up the latitude. Since I am based in London, the latitude is around 52 degrees. Afterwards, I had to align the declination axis so the telescope can be balanced. As I understand it, you should be able to move it to any position on the axis and it should stay in that position. If the front or rear was heavier, I would either pushing or pulling the telescope after unlocking the brackets holding it together. This is where the issues began, I could balance the telescope so it doesn't move while in the horizontal position, however, when pointing it towards north, it would exclusively lean towards one direction - to the left. If the telescope was pointing to north, north-east or east, it would pull towards the west all the time. It is probably easier to show it in the video. I've spent three days trying to balance the telescope by using different methods and it just would not work. I've also tried balancing the RA axis first. This could be somehow done, but the declination axis would still pull the telescope to the left. It is extremely frustrating as I don't know what could be causing this. Balancing the telescope should be relatively easy from what I have heard - either push it or pull it depending on where the weight is. However, I have been really struggling to get it set-up. I would be thankful for any suggestions and please feel free to ask any questions so I can help with finding out what is wrong. Thank you. VID_20190918_202940.mp4
  2. Can someone help me understand how to use the right Ascension setting ring and vernier scale on my CG-4 GEM from Celestron. Thanks
  3. I was wondering, is there an alternative to the ATTH3010 declination unit one could use with the Astrotrac? Counterweight is important, because I'd use a 90/600 APO.
  4. I am trying to understand why the declination position reported by my new EQ8 - Synscan 4 hand controller keeps changing. After starting my aligned scope from Park the declination reported by the hand set ( Utilities/Show Position/ "Dec/Ra" ) slowly increases ( around 7" / minute when I first measured it ). However, the rotation angle of the declination/altitude axis of the mount ( Utilities/Show Position/ "Ax1/Ax2" ) is reported as being constant ( as one would expect if the mount is not receiving an instruction to move ). That is, it would appear that the motor is not running and the encoders on the shaft are not detecting any rotation of the mount's altitude axis however the Sysnscan reports that the Celestial declination is slowly changing. Does anyone know if this is a bug or a feature? It did occur to me that maybe the Synscan is trying to compensate for the declination drift that would result from the Polar Alignment error as stored in the controller after alignment. To test this, I adjusted the Polar Alignment to try to reduce the error and see if it changed the drift rate. The initial results do not support this - after much tweaking of the alignment, and with an indicated polar alignment error of less than 15" in either axis, the rate of drift changed but was still around 5" / minute ( whereas it should be << 1 with so small a Polar Alignment error ). Has anyone else noticed this slow change in declination reported by the mount/Synscan when the mount is tracking in RA? ----- EQ8 MC Firmware version: 2.11.04 Synscan HW version: 4.16 Synscan firmware version: 4.39.04
  5. I have been reading a bit about true north and magnetic north and how aligning my mount taking magnetic declination into account will help. So my declination is 1.41 degrees west. Two questions. If I was to set my compass to this magnetic declination, I need to rotate the red arrow 1.4 degrees to the left and then light that up with the compass pointer and point my north tripod leg in that direction? Is 1.41 degrees going to make that much difference? Not sure I can adjust my compass with that degree (sorry) of accuracy. I may be approaching this all the wrong way. I can see how a mag dec of 10 degrees might make a bit of difference, but we seem quite close here in Gloucester! I used this site to check. http://www.ngdc.noaa.gov/geomag-web/#declination Cheers Mark
  6. I have a Celestron CPC 9.25 and a knocking sound began to come from the declination drive while tracking. The noise stops when slewing the drive in any speed but returns when tracking. The noise was intermittent and sometimes quite loud and so I looked online to see if this is a common problem and to find a cure. Several people reported the same fault but I couldn't find any information or images of the inner workings or how to fix it. I carried out the following three weeks ago and the knocking noise has stopped since then. To do this you will require the following items. 1 set of metric allen (hex) keys, 2 small O rings (see image) Small phillips screwdriver Lithium grease (optional) Begin by locating the hex screw on the declination clutch knob (see image) Undo this screw and turn the knob anticlockwise until it comes off the spindle. Locate the six hex bolts on the inside of the fork arm and remove them. The bottom and middle screws are the same but the top pair are longer but both different lengths. You may have to move the ota to access these. Locate the two lower hex bolts inside the bottom hand recess and loosen them but don't remove. The outer plastic cover should now come off revealing the motor assembly (see image). Look for the two small black phillips screws that secure the gearbox to a shiny silver pressed steel bracket (see image). Note that there is a gap between the bracket and gearbox and this is where the O rings will be placed. Remove one screw and slide an O ring in place, replace the screw and tighten slightly to put pressure on the O ring but not to significantly distort it. Repeat with the next screw. While the side plate is off, now would be a good time to replace the grease on the main brass worm and large cog with something suitable like lithium grease. That's it! Simply replace the cover and clutch knob and things should be quieter.
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