Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.



Advanced Members
  • Content Count

  • Joined

  • Last visited

Everything posted by AlentejoSkies

  1. Hi, Just taken delivery of a mint used William Optics binoviewer (Thanks Wayne!) and it's wonderful. I want to use it for now on my homebuilt 6 inch f/8 dob. I have no problem with cutting the OTA a bit shorter, but I wondered how people manage to combine binoviewer and single eyepieces. If I move the primary up 100mm I can use the binoviewer with the supplied 20mm eyepieces, but will have no way of reaching focus without it. I can add the 1.5x Barlow to the binoviewers, meaning I only need to find 50mm, or increase Barlow power by stacking a couple of units, to make it almost parfocal with single eyepieces, but rather inelegant, and only high power. Do you binoviewer experts out there shorten the OTA and use extension tubes when not using the binoviewer? Or always use the binoviewer and buy two of every eyepiece? Focuser is GSO single speed Crayford with 32mm total travel. Thanks for any advice, Douglas
  2. Experimenting again last night, got some fantastic views of Jupiter at about 180x using two stacked 1.6x barlows. It's the only combination I have that reaches focus. Tantalising that I can't try lower magnifications without making some modifications. I am very tempted to move the primary up a bit... My second scope, the first refractor, coming next month with 80mm focuser travel will give a bit more freedom to play around. I think with a 1.25 " prism diagonal I should reach focus with no barlow, and see how those 3D star fields look like. It was a really calm night last night, which contributed a lot to the great view, but it was also very noticeable that I was staying at the eyepiece much longer and enjoying it more with the two eyes.
  3. Ouch, thank you Louis D, there is an issue... I need to re-check the calculations but it seems like the fully illuminated field falls to almost zero. And I need to think a bit about the effect of that - or maybe just try it out. I think that I will try it out for a while as things are, moving the primary temporarily and if I still like it as much after a few months as I do now, start redesigning. At the moment it seems like the advantage of the brain having two images to work with is so significant that it's worth rebuilding specifically to make that work as well as I can. A one-way trip indeed!
  4. AlentejoSkies


    Ideal would be EQ5 head with RA drive, on 2" stainless legs. I'll be using it purely visual with a long tube 4 inch achromat (6kg) with binoviewer, and often with groups of children. Open to suggestions. Could collect from SGLXI.
  5. AlentejoSkies

    Hello From Cloudy Bristol UK

    Welcome back Mark, from Douglas (in Cheltenham this week)
  6. AlentejoSkies

    SGLXI Final Call :-)

    Just noticed that this is while I will actually be in the UK. Bit of a miracle! (Who) do I need to let know if I want to come for a few hours, but not stay a night?
  7. Thanks for the tips. Interesting how central the observer is to the final effect. I'm learning so much with my 6 inch dob that it feels like there's a long way to go until I will even know which telescope to get next - but I know that time will come! 150x looks good in this scope. 200x it's obvious that there are image flaws.
  8. AlentejoSkies

    A Hubble Bubble. Three nights @ FL1.9m

    Thank you! Absolutely gorgeous. That's an image I will remember
  9. AlentejoSkies

    Lunar Eclipse Sept. 27 (Should be a dandy!)

    A fantastic night over here in Southern Portugal. Clear and mild. Moon a lovely orange transparent floating precious gem set amongst diamonds. Probably my favourite view was through the 10x50 binos, and just beautiful too with the 38mm SWA on my 150mm f/8. We had six children and a bunch of adults here passing the binoculars around and taking turns at the eyepiece, my 3 year-old asleep on a mattress outside with us. Really really great night!
  10. AlentejoSkies

    Newcomers Feedback

    Big thanks for everything here. All the way through thinking about maybe buying a scope, to building my first telescope, knowing what to expect, from the technical to the human, this has been my reference site for the last six months. Really great to find such a community!!
  11. AlentejoSkies

    Ups and downs. Early Days Frustration.

    Thanks for posting. Daydreaming about future kit possibilities, I found this a really useful real-world report.
  12. AlentejoSkies

    lunar eclipse - and what else?

    Any of those other folks from Portugal listening? Would be great to find out it anyone is close by. I would love to see what other folks see through their setups.
  13. So, new telescope, lunar eclipse on the way, good reason to get up in the middle of the night. What else would you take a look at if you were out there with a few friends in the wee hours of the morning? I reckon we won't want to spend the whole night with only the moon, but how bright is the red moon anyway? What is likely to be visible? 6 inch f/8 dob and low light pollution
  14. AlentejoSkies

    lunar eclipse - and what else?

    Thank you Dave. What I understood now from the threads you linked is that there will be enough to see with "just" the moon and I don't really need a list of other distractions for the night.
  15. AlentejoSkies

    Hello from Portugal

    Hello and thank you for this forum. Only joined today but I've been reading for the last few months as every astronomy question I've had so far seems to have been asked and answered here. Just finished building my first telescope, a 6 inch f/8 dob from a second-hand mirror set of unknown provenance, and I'm quite happy with the result. What I thought would be a weekend project (I mean, what's so hard about putting two mirrors in a tube?) took me 3 months in the end even with - or pehaps because of - a strong background in physics and optical design. But now I am a telescope owner/maker and the world is good. Living in rural Southrn Portugal where the sky is fantastic. Nearest streetlight is a few km away... Douglas
  16. Which eyepieces for a 6 inch f/8 under clear sky?


Important Information

By using this site, you agree to our Terms of Use.