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YKSE

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Everything posted by YKSE

  1. Thanks for the explanation, John 14.7psi, that's a good imperial joke.
  2. May I ask what do you see advantage to have EP purged?
  3. First trip to dark site in months :-)

    1. jetstream

      jetstream

      Congrats Yong, I hope more to come for you :)

  4. John, Here's someone sees EOFB both in LZ and 20mm ES 100 degree, maybe you can better estimate how bad EOFB is in LZ. http://www.cloudynights.com/topic/487681-best-es-nagler-eyepieces-for-an-f10-8-edge-sct/?p=6388238
  5. Yes, I see "edge of field brightening" (EOFB)in my LZ sometimes too, I think it also depends on observers, some see EOFB in virtually 40-50% of EPs they've tried, some see nothing. Personally I don't find EOFB in LZ distracting, partly it's not there all the time, also you can zoom-in to make EOFB disappear, also that I observe on axis only with my tracking mount. I'd like to think that EOFB is not much worse than "ring of fire" in some ultra wide angle EPs.
  6. Stu, Leica Zoom with VIP balrow is more cost-efficient than this full case of EPs, IMHO. Optically I've only compared LZ with my BCOs and Nikons, LZ is best, even though differences on-axis is very small. but the fexibility of zoom makes it first choice in observing.
  7. I don't think it'll make much difference if it's marketed as 65° or 72°, the physical limit of Field Stop(FS) determines the FOV you can see in a eyepiece. 2" eyepiece has outer diameter 50.8mm, with wall thickness of 2mm (measured from my 2" eyepieces) of the 2" nosepiece, the inner diameter is 46.8mm, and the Field Stop will be even slightly smaller than that, so the measured FS of 46.57mm is about as big as physically possible. As Michael mentioned above, the pincushion in the eyepiece may account for the discrepancy, but don't make any real world difference.
  8. My guess is that 65° AFOV is more correct than 72°. The Field Stop(FS) of 42 LVW is measured as about 46.57mm by a CN member (he has loads of eyepieces), that is the widest of ANY 2" eyepieces, so it gives the widest possible TFOV of a 2" eyepiece. Or we can do some math, TFOV can be calculated in two ways: 1. TFOV = AFOV / magnification 2. TFOV = FS *57.3/ FLscope we get AFOV/magnification = FS *57.3/FSscope that leads to AFOV = FS *57.3*magnification/FSscope =FS * 57.3 /(FSscope/magnification) and magnification/FSscope is actually focal length of the eyepiece, that gives AFOV = FS * 57.3 / FLeyepiece = 46.57*57.3/42=63.53 And that CN member measure 63.5°
  9. EP case finished, waiting for clear sky...

    1. ronin

      ronin

      Picture required of case and eyepieces.

  10. Was it that obvious? Two half clear nights in a whole month Better to do something fun and save a few bugs than to complain the weather was the idea.
  11. After adding some new toys, the case looks a little different: Drawing: Schema: The case:
  12. Plantins, Congratulations , those three cases are super-heavy weight collections, not only quality wise, literally too.
  13. That's a superb collection of eyepieces, Gavster, congratulations
  14. a short vacation coming :-)

    1. Show previous comments  2 more
    2. Pig

      Pig

      Where are you going to Yong ?

    3. YKSE

      YKSE

      Visiting some old friends in China :-)

    4. Pig

      Pig

      Should be nice... enjoy Yong

  15. It might be of interest to you that he sold that one not long after he got it.
  16. Knowledge is espeically useful when budget is limited, IHMO. I'd recommend this link so that you get an idea what others think of uppgrading: http://stargazerslounge.com/topic/217907-first-eyepiece-upgrade-what-you-wish-you-had-done/?hl=%2Bfirst+%2Bupgrade+%2Bykse#entry2338965
  17. I'd recommend these links if you haven't read them: http://stargazerslounge.com/topic/43171-eyepieces-the-very-least-you-need/page-1 http://stargazerslounge.com/topic/219151-5-years-of-reviews-and-reports/ The SWA, e.g. are heavy eyepeices, hevier than the 32mm Panaview, especially the shorter focal ones.
  18. 120ED, Zeiss prism, Herschel Wedge on the way...

    1. Show previous comments  1 more
    2. emadmoussa
    3. YKSE

      YKSE

      Thanks guys, I'm refrac man now :-)

    4. Pig

      Pig

      Excellent news Yong :-)

  19. Nice collection there, Derek. Your wallet might sense some danger when there's a empty spot in the case
  20. Shaun, the SUN seems making your EP case smaller, when are you going for a full set of Kellners
  21. Nice work John, SLVs seems to be good planetary EPs for spec wearers.
  22. Nice organized case! The extra space seems to feel the need of new toys.
  23. Excellent job Alan, you're not making it easier for those who just want to pick one
  24. There you're, chance to free space for 2 or 3 EPs
  25. Great write up, very infromative and excellent guide. +1 for pinned!
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