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jetstream last won the day on July 7 2017

jetstream had the most liked content!

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About jetstream

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    Red Dwarf

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    Land of the Ice and Snow
  1. jetstream

    Stephan's Quintet??

    Exactly what I experience Olly. The 3 cores of Stephans Quintet are visible in a 10" dob under dark and transparent skies. I don't see star like dots but 3 very faint, delicate hazy patch's that can seem to overlap. I hold them in direct vision for 10s-20s at a time roughly under VG conditions. Less than vg transparency makes these disappear to my eyes and good orthos of the appropriate fl helps quite a bit.
  2. jetstream

    Rocky Mountain highs & lows

    Glad you had a good holiday Stu, what scenery! Its always worth taking a scope along IMHO and I've always wanted to observe from higher elevations.
  3. Hey UK why did you send all these clouds?

    1. Maxrayne


      Because we like to share :) 

    2. Pig


      What’s ours is yours Gerry 🙈

    3. jetstream


      Thanks guys...🌧️😀

  4. jetstream

    Observing Nerbula

    Dark skies are paramount for observing nebula and under them objects like the Swan and Lagoon are bright with no filter, however a good UHC and OIII will give much flexibility to your observing. It might be good to observe these objects with a filter and with an eyepiece that gives a 4.5mm-5mmish exit pupil in your scope. My current pick for the needed OIII and UHC would be the Astronomik. Gerry
  5. jetstream

    What has experience taught me?

    So true Neil. Last night was perfect to observe the moon I noticed as I finished up some winterizing. During all this the wife opened the door and said "someone wants to come out" and here was the 3 yr old all dressed up to come help me. After we finished a few things we walked down to the point on the water where she said "the view papa!" We watched the sunset and then the moon for a nice bit then went to the swing for one last push. We then went to play "air hockey" with her sisters lol! Personally I'll forgo astronomy for moments like this. Friends and family are more important IMHO. The moon/stars can wait.
  6. jetstream

    What has experience taught me?

    Great report Neil!
  7. jetstream

    Which secondary......

    My limited experience shows me anything below 25% CO will not be noticed contrast wise with good optics. I also like a nicely illuminated fields. http://www2.arnes.si/~gljsentvid10/diagonal.htm
  8. jetstream

    Which secondary......

    what f ratio is the scope?
  9. Definitely. Exactly my thoughts too...
  10. Baader replied promptly but declined to disclose the lens source as they don't want to give manufacturing details away. They assured me it works fine and meets their requirements.
  11. To each their own I say and while I do explore the NV option, the views through a telescope and eyepiece give me much satisfaction. Many, many faint objects are there to see if you get things right and so far things are working out. Seeing the Crescent nebula, parts of IC1318 and the Veil (very well) with no filter is very rewarding. In this case image scale is needed (ie Blackwells research) as you indicate but it must be at the proper illumination for the eye (exit pupil)- of course extremely faint, small (in EP) galaxy cores can be a bit different, IMHO.
  12. Increased aperture brings the potential to see more fine detail on planets etc and optical quality determines how much of it gets "through". In terms of seeing extended objects it is the optimum exit pupil at the mag needed to see them, and this in part is a function of aperture, that determines how we see them. Rayleigh criterion etc does not apply to extended objects such as the ones I mention as they are not "point source" objects to resolve. I have no idea why some refractors are better than others on these faint nebulae. There is a difference to my eyes, under my conditions and it is noticeable. My question is why?
  13. Well...it depends on the object and size of the object that is being viewed ie large faint nebula. Louis, can you explain to me why there are differences in what I see on these faint objects between quality telescopes?
  14. Great stuff Gavin, I love these accurate test reports. What I really want to know if there is any difference visually on faint, diffuse, extended objects between scopes testing similarly. Those color test fringe patterns are all taken of the lens assy I presume? a min .96 Strehl (red) is superb and more across the board. A future binoscope project is watching this thread closely...
  15. I would think that the Canon fluorite is among the best available...no doubt. Baader has/had an association with Zeiss at one time and this is what intrigues me. There has to be superb glass in this scope from the reports read and the cost of the telescope IMHO. If there is Canon or Zeiss lenses in this telescope it would be my pick, for sure. There may be other top notch German lenses out there too...

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