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westmarch

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Everything posted by westmarch

  1. High cloud from the NE is rolling in now. Saw the Nova Cass, pleased about that. Sadly lot of light pollution from a new container park is intruding in a lot of the DSO stuff. Aiming for a local darker locale towards the end of the week when it is predicted clear again. Hope others have a good night. John
  2. Dob out. Lights out. Gear going on. Hand heaters on. I may be gone some time........ John
  3. Hi there, If you look on my original thread, towards the end, I have posted a pdf with full instructions on the build. Those instructions should work for an 8” Dob. John
  4. To be honest you will not see much difference with the moon. It is so bright that aperture is not an issue. Bigger dobs come into their own with faint objects such as deep sky objects. If these aren’t your priority then the 200 will probably be your best bet. regards John
  5. Hi there, you might also consider a second hand 250mm Dob. Most are either well looked after or have been rarely used. If the main mirror is in good nick, any other problems are relatively easy to fix (the folks here are very willing and able to advise). That might help you stay in budget, get the most aperture and leave something over for eyepieces. Hope you find something that suits. John
  6. Hi Gang, A very professional build. You are obviously blessed with a level garden. I needed the furniture levelling feet to get the whole platform level. John
  7. I have not tried it but I believe they would. John
  8. Following requests from a number of members I have attached more detailed instructions on how to build this equatorial platform. Including a correction of a typo in the original post correcting 8mm for 18mm bearings. I hope it is of some help. John Equatorial Platform Basic Guidelines.pdf
  9. Why don’t I pm you with the dimensions. It will take me a day or so to work it out for your smaller 8” dob. John
  10. Is it the wooden base you need help with or the aluminium arc segments? John
  11. Hi there, The aluminium gets good traction due mainly to the weight of the dob. It only slips when it reaches the end of the travel and hits the stops. John
  12. Hi there, good luck with your project. What aspect are you having problems with? John
  13. Hi there Martin, Welcome to the forum. I wish you luck with the scope and many dark nights. John
  14. Sorry if I misled you. It was a pun on the weather. John
  15. I recommend a fast telescope as the only way to see the conjunction properly. It needs to be up, cool and focussed in less than two minutes between sunset and cloud gaps. John
  16. Saw this exposure of 2,953 tracks of the sun on the University of Hertfordshire website: https://www.herts.ac.uk/about-us/media-centre/news/2020/longest-known-exposure-photograph-ever-captured-using-a-beer-can John
  17. At least budgies know enough not to try try to argue about fundamental physics. John
  18. Cracked it this evening at 16:30. Clear SW horizon and got them both in FOV of my 20mm 68o EP. Could only do it from an upstairs bedroom window. My wife thought I was running for a bus. John
  19. Hi there, a properly installed and calibrated dew heater will only heat the air in the scope by a few degrees or so above dew point and generate minimal air currents. A telescope stored indoors can be ten or more degrees warmer than the outside temperatures and will generate significant air currents while it cools down - interfering with seeing. Fans on reflectors speed up the initial cooling of the scope mirror on taking it outside. Hope that helps explain the paradox. John
  20. Some impressive video captures of a fireball in Japan on BBC Asia feed. https://www.bbc.co.uk/news/av/world-asia-55121824 John
  21. Just had a look. I can see the gap but not the difference in shade. No doubt a combination of skies, scope and eyes. Clear skies already clouding from the west so thanks for the heads up. John
  22. OK. The warm front has just moved in from Scotland. Yorkshire sky is completely buttoned up now. I’m packing up. John
  23. Aargh!!! It seems everyone is having their bonfires and setting off fireworks tonight to avoid the lockdown.
  24. Cracking drawing. Well done. John
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