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About jetstream

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    Red Dwarf

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    Land of the Ice and Snow
  1. Quick nebula sessions before clouds

    What is this Peter?
  2. Globulars and galaxies

    Thats kind of what I was thinking, but can barlows work with these things? Last night the trans was poor and my views suffered tremendously. Is NV as affected by trans as much as conventional viewing Gavin?
  3. Globulars and galaxies

    More great NV observing Gavin! Your views are similar to my 15" under dark skies generally - the Needle galaxy is very similar and using the binos on these bright ones can carve out the dust lane better, same goes for NGC 3628, the Hamburger galaxy etc. I believe this is only because you are hunting combinations to use with your NV and once you have them all figured out the views will be at least as good mine- and most likely better from truly dark skies ( I would bet on it). M13 etc look similar if I use low power, the advantage the scope has is the easy ability to up the mag and massage the FOV with different eyepieces. Once again I believe that once your combos are nailed down you will out compete conventional scopes. The 15" excels on these clusters however and with the Binotron 27's give 3D visual images, quite a sight. I forgot to mention M82- my image brightness is the same as in your large image but with a bit more and sharper detail in the center section. Question- does the speed factor remain the same for point source objects as extended ones? ie can you up the image scale on M13 and maintain the star's apparent brightness? I can't wait to see how this NV works from dark skies. Great pioneering work Gavin, thanks for sharing this.
  4. Quick nebula sessions before clouds

    The images are great Gavin and these two mirror what I see from home under the best conditions and with an appropriate scope. ie I see a grey version of the California the same as your image shows, and with the same structure and wisps. Your images are really helpful, keep them coming! Thanks, Gerry
  5. Planning your ideal eyepiece collection

    I'm with Stu- the DeLite.
  6. Bino advice

    You will like binoviewers I think Peter and a primary "concern" is the use of a glass path compensator or "OCS". Mine adds a 2.3x multiplication factor. Also it has been proven by others (and then by myself) that using longer focal length eyepieces and then with a compensator makes binoviewing much easier, espc merging. Therefore I would say that the 12mm FL you want would be better to achieve with longer FL EP's, IMHO. You also should have the ability to adjust the diopter- either with eyepieces like the Zeiss microscope eyepieces or with binoviewers like my Binotrons. Others most likely have this much needed feature too, not sure. Russ Ledermeier sold me a package that works great on any scope, and made an extra extension for the big dobs- binoviewing is a "system" and having all things come together makes for extraordinary views...
  7. H130/NGC 3998

    Thanks and yes this scope is performing way above its payscale
  8. H130/NGC 3998

    Simbad gives a V mag of 12.1 for NGC 3998 and I'm quite pleased that the Heritage 130 pulled it out in direct vision tonight. First caught in the 24mm ES 68 the galaxy responded to a bit more mag using my orthos. Another object revealed itself tonight- the Flaming star- no filter, this little scope sure works. The sky was above avg - not the best (for here) but with nice trans. Piles more seen with this scope tonight, I like this thing. Gerry
  9. Planning your ideal eyepiece collection

    In my f3.8 the TV plossls could benefit from a coma corrector
  10. Planning your ideal eyepiece collection

    I agree with Piero- get the EP that will get the most use. I'll give you an example of the widefield vs ortho on faint (for me) galaxies. In UMa there is a nice little group of galaxies, a few easy and one tough one. These are NGC 3972,NGC 3982,NGC 3990, NGC 3998 and the hard NGC 3977. The 12.5 Docter shows the first 4 easily, with the last one popping in and out of averted vision. The 10mm BCO will hold NGC 3977 in direct vision mostly. Now some might jump up and down citing the magnification difference between the 12.5mm and the 10mm- well my 12.5mm Tak ortho doesn't see it and the 12.5mm Tak LE is not even in the running. The cheap as chips 9mm Circle T holds it well, at least as good as the 10mm BCO, here the mag might be at play. I don't enjoy staring for hours straining my eye for these little faint glows popping in and out but observe these in short bursts. The majority of my observing is with eyepieces I enjoy and on objects that are pleasing, brighter ones really. You might want to base your eyepieces on the latter type of objects, but that depends on what you like and what your goals are. ps- I bought many used orthos and sorted through them finding the best ones...
  11. Planning your ideal eyepiece collection

    I would say there is no difference in performance - actually I like the Lunt better on most objects. I use the 12.5mm Docter in my scopes, 10" f4.8 dob included and find it more flexible on many objects than my former 10mm Ethos, which was an excellent EP. For galaxies alone the 9mm Lunt might be a bit better than the 13mm supporting what Piero mentioned. In my comparison of the 12.5mm Docter to the 10E there were minimal differences on most galaxies and if searching out very faint galaxy core the 10mm BCO/9mm Circle T/7mm KK orthos go in which have better performance on extremely faint objects than the widefields. Just my opinion here...
  12. Planning your ideal eyepiece collection

    My grand daughter owns the ES 24 68mm (which I borrow a lot!) and have compared it to the Lunt 20mm HDC, 30mm ES 82, 25mm TV Plossls etc. Firstly, the Lunt competes directly with the 21mm Ethos (yeah I have that too) which means the Lunt is near the top of the food chain. The ES 24mm 68 is VG and I would say a hair better than my ES 30mm 82- in terms of contrast on filtered DSO, and other things -but- on super wide nebula the FOV the 30mm provides gives a better view IMHO and this is why I own it. Neil, if it were me buying a couple of eyepieces for your new dob it would be the 20mm Lunt HDC and I would also try the 13mm Lunt HDC.
  13. The curse is lifted

    Qualias sketch is very much like I see M13, but with the propeller feature distinct.
  14. The curse is lifted

    I was curious as it looks like a "spider plant" to a few of us. Using a widefield helps see this too. M13 is an amazing object and I hope you spend much time here.
  15. So many top imagers ie Astroavani, Kokathaman , Peach etc use those pesky SCT's to great effect! I guess refractors can't compete in this realm...