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asteria

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Everything posted by asteria

  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. One of the thumbwheels on the counterweights broke and I have repaired it with araldite. The dovetail clamp is scratched and there are various other marks due to age and wear. This mount has only been used for visual astronomy since I have owned it. Three star alignment makes for very accurate goto finding. A previous owner possibly overloaded it for astrophotography so one of the altitude bolts was bent when I bought it on the Lounge. I replaced this with an ordinary bolt and it's been fine. Once it's set it doesn't need adjusting unless you take the mount to a location distant from your usual observing place. I think this problem is relatively common if the mount is subject to heavy loads. This mount has the heavy duty tripod which adds to stability. I've owned this for around ten years since I purchased it second-hand. Do get in touch if you have any questions. I would prefer this to be collected, but perhaps we could do something with delivery if relatively local. I'm in East Devon. £350.00
  2. Hi there - I've pm'd you re. the shield. Thanks. Ed
  3. Hi there - glad this worked out well for you. Best wishes and good luck with your observing. Ed
  4. 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/
  5. 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
  6. 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 woodworking skills it could be made to look more sophisticated, but I quite like the aesthetic. I'll take some pictures of the scope broken down, so you can see what I was aiming at with the portability.
  7. 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.
  8. 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.
  9. Hi there - I've sent you a PM. Many thanks. Ed
  10. Thanks for the link - that's a helpful summary of the influence of the spider on diffraction. Ed
  11. Exceptional work - thanks for sharing your latest effort. I'm sure your friend will love the views.
  12. What an amazing looking scope - fantastic workmanship. Good luck with your first night under the stars with this.
  13. Great report of brief session - binos are great for this sort of session.
  14. Great project - good to see your progress with it.
  15. I'm interested in this too, what do people think about attaching one to a wooden dob tube? Ed
  16. Hi there - I'll be looking forward to this new project. Thanks for keeping us up to date. Ed
  17. Hi - this should give you all the parameters: http://stellafane.org/tm/newt-web/newt-web.html It's a very interesting site, that calculates all the maths for newts. Ed
  18. Good piece of work. I'm thinking of having a crack at something like this. They had a good project like this in the recent S@N magazine.
  19. I got the teflon from ebay, a small piece was pretty cheap, and it cuts easily into squares with a knife or fine saw.
  20. Just wait until the neighbours discover solar powered garden lights, mounted on top of the fence. No power bills, and they light up just as it goes dark and stay on all night. Great! I think they've sat out under the lights for a couple of nights this summer....Luckily the lights are not too bright, and an empty plant pot over the top blocks out unwanted light. LP has definitely got worse over the last couple of years as security lights etc have become much cheaper. Our street lights are still on as well. According the the Campaign for Dark Skies website, the more light at night, the greater the problem with crime. It doesn't work the other way round - i.e. darkness encourages crime, which is unfortunately the 'common sense' view.
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