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YKSE

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About YKSE

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    Bridge, badminton, mushroom picking.
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    Gothenburg, 57°, Sweden

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  1. What is the eyepiece(s) you use for alignment? I use Baader zoom for C8 on EQ3, its 24mm - 8mm settings covers 0.48° to 0.33° TFOV. mostly only 2-star alignment for the meridian I plan to observe. Alignment finishes with the two stars dead-centerred in 8mm with errors around 10' both in DEC and RA. Slewing to known targets in the same meridian with 24mm, it'll be at worst very close to the edge. Viewing with EPs showing 1°TFOV, the targets are mostly near center. When the battery works, i.e.
  2. They look certainly very nice, of great build quality I'm under impression that short focal EP pairs are more challenging than longer ones, so the smooth barrel is huge plus for mitigating addition mering difficulty. The 2 Hi-LEs are of different optical layout than other LEs, they look like barlowed orthos to me, hence the longer ER: Im looking forward to read your first light report.
  3. With my short experience with BST 8mm and 12mm, it definitely agrees with your observation, orthos showed much better scatter controll, planetary and doubles are simply better.
  4. very nice report As you can get along with binoviewer, I'd think you get cheaper EP options for better Solar, planetary viewing than 100° EPs.
  5. Japp, sunny here too. In PST view, the proms are in 4, 5 and 11 o'clock, the 4o'clock proms is quite fainter than an hour ago. seeing is very good, nice surface detail when going up to 50x, which doesn't happen so often.
  6. Great pictures. Got a clear day here. The two proms are quite good in PST. White light with 120ED and binoviewer with 18mm BCO in 100x are actually noticeable better than your first picture, many more spots between the two close Sunspots.
  7. I think it's Jim Thompson's measurement done in 2000 As seen on the graph. You can find many of these graphs here: http://www.karmalimbo.com/aro/pics/filters/ The one linked by John is namned O3a.jpg I posted a question on CN about reading these graphs, Jim gave his comments in the end of the thread. https://www.cloudynights.com/topic/512332-ranking-of-uhc-filters-by-this-chart/?hl=%2Bfilter+%2Branking#entry6787299 The FWHM for your filter is around 12nm (50% transmission is about from 492nm to 504nm), a very good narrow range, transmission for OIII lines (496nm and 501nm, however, is a bit lower (around 90%) than we usually than top Lunimicon OIII.
  8. Congratulations! Even though UHC is not the best filter for the Vail, I'm looking forward to read your impression of the filter with 32mm on the Veil, wiht and without the f6.3 reducer.
  9. I can see three very expericenced members on that thread(GlennLeDrew, John Isaacs and Jhayes_Tucson Referring to my own much limited experiences, for observing galaxies, I usually only thinking of getting about magnification to get galaxies in right size (2° to 3°), any magnification don't change the contrast, so Glenn is correct. While for observing larger nebulas, the magnification is not a primary consideration (it's usually already much larger than 3° in very low mag), especially in combination with a narrow band filter (UHC/OIII/H-beta), larger exit pupil does improve the constrast, since these suitable filters do dim the sky glow much more than the nebulas, so the Johns (Isaacs and Jhanyes-Tucson) are correct too. More practical examples, For OP with current 1.25" EPs, with an OIII filter, 32mm EP with a f6.3 reducer should clearly show the Veil much better than with the reducer. If OP has good dark sky, with an H-beta filter, 32mm with a reducer should give him a fair chance to see HH, and almost no chance without the reducer.
  10. There're many different numbers everywhere. The faint fuxzzies I've seen or not able to see seem to corresponds well to the numbers given here http://www.deepskylog.org/index.php?indexAction=quickpick&titleobjectaction=Search&source=quickpick&myLanguages=true&object=ic+1296&searchObjectQuickPickQuickPick=Search Object
  11. Exactly! My search shown there're over 2000 galaxies brighter than mag 13 and high enough for my latitude for C8, with my going rate, it'll take me a deade to finish, so aperture fever doesn't really catch me
  12. Yes, that's why I said threshold object at best with C8. Reading the link posted by Calvin in post 4, where Acey mentioned CN discussions, Pensack did managed IC1296's core with his C8.
  13. Mag 14.3 and size 1.1'x0.8', it's at best threshold galaxy for C8 in dark site, I'll give it a go when the darkness returns. 6207 near M13 is an easily neglected galaxy because of M13, but it's fairly bright, doable with C8 in my light polluted backard (mag 4.7 sky).
  14. Congratulations Shaun, looking forward to your first light.
  15. It looks like the sweet spot means coma free zone, there're a number of slightly different ways defining it, one is 0.022mm x f-ratio^3 It gives the coma free zone diameter 2.8mm for f5 and 11.3mm for f8.