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Relpet

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About Relpet

  • Rank
    Star Forming
  • Birthday 03/06/1939

Profile Information

  • Gender
    Male
  • Interests
    Astronomy, films, history books, French Resistance, sitting in the sun pondering the ineffable mysteries of life.
  • Location
    South-west France
  1. That's good to know. I'd rather support the sponsor whenever possible and it's those oppositions, low in the sky, that spurred me to start the thread.
  2. I'm really pleased to have started this thread as it has produced a lot of informed comment. If anyone is interested in the Omegon it can be had from Astroshopurania in Belgium for 129 euros plus modest delivery. I don't know of a UK dealer. I like the red marking ring on the Omegon but other than that can't see any difference between it and the ZWO.
  3. I never quite got how you define a planetary EP. I do have some good, some very good and a couple of excellent EPs in 1.25 and 2 inch sizes ranging from 5mm to 38mm so I'm guessing I just need the ADC. Still waiting for some indication that the skies might start clearing more than six hours a month before making a purchase.
  4. 'Nuff said, Tim. Brilliant sketches. 7" refractor, eh? Oh. Blimey. There's another giant step forward from my 3". Thanks a lot. Peter
  5. Thanks, Tim. That's exactly what I expected to learn if the ADC is used correctly. The cost is about what one would pay for either the ZWO or Omegon. May I ask which is yours, please? By using coloured filters you inevitably block off an element of light whereas with the clear prisms in the ADC there may be some light loss but the full spectrum would presumably still be present, if slightly reduced. I've been in England for a couple of months now and am impatient to get back to France where all me astro gear is kept. The first clear night I'll try out various filters but I'm even more persuaded now that the ADC is top of the birthday present list. Thanks again, Peter
  6. I'm delighted to leave that field entirely in your hands, Merlin!
  7. Aristarchus and others

    By coincidence I've just about finished Patrick Moore's "Guide to the Moon", published 1976, that I picked up from a charity stall a few weeks ago. Although the great man was no stranger to controversy, and his view that the craters were largely created by volcanic activity seems at odds with today's received wisdom blaming massive meteorite bombardment, I have been inspired by his detailed insight to spend a lot more time moon-gazing this year. Your eloquently written piece based on experience with an 8" Dob in a single night I find greatly encouraging. Many thanks.
  8. Thanks Agnes. I'll try every filter in my box once I get the opportunity but not convinced any of them will be that effective. Off topic, my grandmother's name was Vanderhoek. Her grandfather emigrated from Dordrecht in the 19th century so I've always had a soft spot for the Dutch. Heel erg bedankt!
  9. That's a valuable comment when it comes from a user - even a disappointed user! I do my observing mainly during the summer months at 43 degrees N but the planets this summer will all, so far as I can discover, be low in the sky. Weather the last two summers in SW France has not been good for stargazing but if we do get a good summer this year atmospheric dispersion could be quite high. I know from other reports about the need to adjust by minute amounts and would be prepared for that. I have the kit for imaging but not much chance to use it so far. Maybe this year. Good luck in Tenerife.
  10. We see so many dark, bleak, deeply psychological and doom-laden TV series from Scandinavia it's refreshing to see that there is still a sense of fun in Sweden. Cheers!
  11. Yes, the principle has been known for many years, it's the affordability that is different. The ASH and Pierro Astro ADCs can still be bought but the ASH for double the price of the Omegon and, in the latter case, for the same price as an 8" Dob. It would be wonderful to be able to see one in use and make a judgment. As prices drop perhaps they will become more commonplace. In the meantime I'm setting aside my pocket money for a purchase in early summer.
  12. The principle is to correct colour distortion caused by diffraction in the thicker atmosphere at low altitudes. By careful adjustment the diffraction is reversed. There are lots of articles written on the subject. This one by Damian Peach (http://www.damianpeach.com/images/articles/JBAA dispersion Peach.pdf) is an example. Damian is one of the world's foremost imagers but other users confirm that there are tangible benefits for planetary observation. Mars will be very close this year, but low in the sky. For me it's proved impossible since I took up the pastime three years ago to get a decent look at Mars and I'm prepared to spend the money to get a better view than might otherwise be the case. A number of members of the Cloudy Nights forum have given positive reviews of the ZWO ADC for planetary observing. No one has been forthcoming on the Omegon. Few people on SGL seem to have an opinion so check out Cloudy Nights, maybe, for more direct advice from satisfied users. Both the designs my topic was about work on the same principle and are significantly cheaper than anything available previously - hence my interest. I hope this helps.
  13. Thanks Ant. My cut and past didn't work - hence the pdf. Sadly, still no response. Not a popular topic, I guess.
  14. See pdf attached ZWO v Omegon ADC.pdf
  15. Hiya from Brighton, UK

    Hello and welcome, Russ. You will get heaps of good advice from SGL members all around the world but to make contact locally you might try subscribing to this site: http://gostargazing.co.uk/ They will send frequent notifications of stargazing events within easy reach of Brighton where you will get the chance to meet other devotees and, with any luck, get the chance to try out other kinds of telescope and compare the quality of different makes of eyepiece. There is a registered dark sky site in the South Downs national park but it's over near Midhurst - a bit of a trek for you. There might be other points along the South Downs Way closer to you with decent skies, though. My wife's parents used to live in Saltdean and we often found the weather would change, for better or worse, when we drove from Surrey through the South Downs. So if you're ever bothered by sea mist on the coast check the weather inland. You just might find that an invisible hand has swept the mist away just a few miles inland. We saw the last total solar eclipse in UK from Telscombe cliffs and watched an amazing meteor shower from the beach at Saltdean in years gone by. I hope you have the same luck.
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