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asteria

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About asteria

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    Star Forming

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    Southwest England

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  1. Hi there - I'm selling my Celestron CG5 GOTO mount with the Celestron 7aH power pack. I have upgraded to a more modern Skywatcher mount. The mount is in good working order and in pretty good cosmetic shape. I've powered it up and it works fine. It comes with the polarscope fitted. The last time I used the mount it ran right through the evening without any noticeable degradation in the power supply. However, the power pack is a good few years old so I'm not sure how much life it has left in it. The main reason that I'm selling the power pack is that the new mount needs a more beefy supply.
  2. Hi there - glad this worked out well for you. Best wishes and good luck with your observing. Ed
  3. Prototype two. This is a much better design, and takes its inspiration from Ross Sackett (http://stardazed.com/). Of course the main difference is that he is a craftsman and I'm a bodger. This is a much better design but the secondary mount and focusser board is way too heavy. However, the basic design elements are now in place. The final picture was the primary inspiration. The 'punk' aesthetic gave me hope that i could build something like this too. https://www.instructables.com/id/Airline-portable-8-Dobsonian-telescope/
  4. Here is the first prototype - this is a shocking design. Don't even think about trying this at home! With the cardboard prototype you can see the problems immediately. Terrible deflection. The rotation of the tube is not so apparent in this photo, but is a real issue. The video shows the bounce and wobble. Back to square one. DSCF0561.AVI
  5. Hi there - thanks for the interest. The scope actually works really well. I think the longer focal length helps as the tolerances are not as tight as they would be with an f5 mirror. I ran out of time with the secondary, so essentially the mirror is mounted on a wooden block, which is attached to an aluminium strip which allows for collimation. However, once adjusted, it will hold it's position within the session quite well. The balance is also pretty good, although the 'tube' will slip in the mount if the altitude is low. I think, as a proof of concept, it was a success. With more woodwo
  6. Hi there - here are some pictures of the single strut dobsonian that I built a few years ago. It's a bit crude (I'm no cabinet maker) but it works. It could benefit from some refinement - one day! Any questions do ask. (Yes - it is made of chipboard.....out of a skip. There, we've got that one out of the way.) 150mm, f8, if I remember correctly. I made it to take to Australia - fits in a suitcase. The strut has to travel separately.
  7. These mounts are very good for visual use. I have used one for a good few years. Very sturdy and easy to align/operate. I use two star align plus some additional stars and this gives very accurate slewing and positioning.
  8. Hi there - I've sent you a PM. Many thanks. Ed
  9. Thanks for the link - that's a helpful summary of the influence of the spider on diffraction. Ed
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