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jetstream

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Everything posted by jetstream

  1. Wanting to show a fantastic view of something is a nice idea, sometimes this desire can put extra pressure on, but really we (well me) are only observing for ourselves and if someone else likes it great. A neighbors grown children from far away expressed honest desire to see my equipment and outdoor obs, which I showed them. Next year they are invited to come over to look up and they are excited! In truth the only jaw dropped on the ground I care about is mine lol! if someone elses does bonus!
  2. IMHO most people could care less about astronomy and we should adjust our expectations accordingly, unfortunately. I also could care less what people think about astronomy! I just love to observe. @domstar no need for negative feelings and congrats for getting out observing!
  3. My VX10 has a pretty good focuser but fell apart when obs on the ice. I found the parts, loctited them and alls well. The 200mm f3.8's focuser is a complete piece of junk and is barely working now, its a new design with a unique 1.25" adapter.
  4. My 200mm f3.8's primary didn't fit their own cell so they siliconed it causing massive astigmatism My VX10 is good.
  5. Sounds interesting, I might try one. With the Teletube the end can be extended and the focuser racked so it gives a "circle" edge the same as the sec circle picture sight. This will show the position under the focuser very accurately as well. How do you find the accuracy of sec alignment to the primary and vice versa using this tool?
  6. This adjustable sight tube works very well and very accurately. I removed the 24" spider/sec for a fiber batten tweak last night and re collimated. Sec is accurately centered and collimation is not perfect (no AC) but very very close. You can extend the tube into the focuser to get a really fine view of the sec edges. Fast, accurate, simple and expensive.
  7. A good newt is hard to beat and I would think that you either have to splash out on an expensive SCT or get a "good" one to compete with the newt. Which refractor? which SCT? generalizing is not the best option IMHO. A top refactor offers such purity to the view.... and will take high mag, at a large price. However a top SCT type scope can deliver stunning views, @dweller25 might (does) have a good opinion. Then there is the 200mm f6 newts out there that can make so many high end scope owners cringe under good seeing...
  8. Had a poor sky last night so I got around to fine tuning the 24" and tried different EP's with the Paracorr. The 21E/17E really work with the PC- TV knows what they are doing. I can see why you guys only use a small few eyepieces now- whats your thoughts of the Delos in the bigger scopes? I'm thinking of a deep eyepiece or 2 for easy use with the Paracorr. My Nikon HW so far wont work with the PC which is too bad, it is a superb eyepiece. The Docter is most likely out too, but I'll try TV's infocus adapter before getting the 13E.
  9. In my case there were a couple of issues for the wait- cost yes, with a but...I wanted to be re assured that the Paracorr would work very well, its too much money (for me) to buy and have not work. Second, my 15" at f4.8 gives such good lunar/planetary views I didn't think it was needed, however I think an improvement will be made with the CC. I'm curious about 2 things- on axis sharpness and threshold objects with the CC. Oddly enough I use far less eyepieces with the 24"? some might be on the chopping block, with a Delos or 2 coming (back) in. I just cant wait to try the 21E/Paracorr II on the Swan neb.... the Nikon HW might get chopped, we'll see. Down the road I would investigate sub f4 dobs Piero, in the 16"-18" range and the corresponding need for truly engineered mirror cell design. Lockwood is one of the only makers really into this, but a couple of others can do it ie Terry O, not sure about EU. NV will add a different perspective on objects and offer much flexibility to observing. Me, I'll slog away with a few pieces of polished glass and a dark sky lol!
  10. In my brief experience with truss dobs it seems to me they have unique likes. At times I leave my shroud pulled back at the top of the mirror box to allow any heat to rise up there. I cool with the fan-pre seacan that is- and then turn it off to observe, I find tiny blurring caused by the fan. The white seacan keeps the 15" and 24" within 4 deg F of ambient, which is great and with no early morning dew. When its really cold I keep the shroud all the way on to combat body heat wrecking the views, this can make a big difference as does the stance taken to observe.
  11. https://www.edmundoptics.com/resources/application-notes/optics/comparison-of-optical-aberrations/
  12. This link explains it simply, spherical aberration " Characterization Image Appears Blurred, Rays from Edge Focus at Different Point than Rays from Center Occurs with all Spherical Optics On-Axis and Off-Axis Aberration Third Order: W040 = ρ4" Coma," Characterization Occurs When Magnification Changes with Respect to Location on the Image Two Types: Tangential (Vertical, Y Direction) and Sagittal (Horizontal, X Direction) Off-Axis Only Third Order: W131 = Hρ3;cos(θ)"
  13. Thanks Piero,I will when the weather co operates - last night I had a tiny window to try it out. I wanted to see how it affected the 10BCO first but the Docter was next up but so was the moon. I hope this straightens out the Zeiss zoom, it doesn't like f4.... I can tell already the Paracorr is a winner Piero, I want to test it on those small faint averted galaxies to see any impact. You buying one?
  14. Thanks Alan, I will try this- what a difference the Paracorr makes.
  15. The Televue Paracorr II finally arrived after almost going to the wrong address- this is life here in rural Ontario. I'm most likely going to say what the dob mob already knows- this thing really works. It gave a super clean, textbook split of the Double Double with the 21E- edge to edge. This set up gave what might be the best view of the Veil yet, actually Pickerings Wisp was a mass of twisted nebulosity right around that "bubble" I mentioned in other reports. I had been told that the reduction of coma should in theory give me better contrast on nebula and the advice givers were extremely experienced optics and scope makers- if this one obs session is any indication it does. The 30ES 82 was set up using Pensacks advice- I set up the 21E on "A" and focused, then the 30mm ES was focused using the Paracorr's adjustment on "F" roughly. This method worked well, however the 30ES did not offer the contrast the 21E did- by a long margin despite the greater illumination. Large features or small on the Veil the 21E won handily. The 10BCO is parfocal with the 21E and used "A" (using TV's Paracorr adapter). NGC 7331 was observed with its bright core showing well, not all the fleas were observed but the pending moon and some very light high cloud moving in may have affected the view. Stephans Quintet needs very dark transparent skies to show well even in the 24", under the best conditions these galaxies show brightly but get down around 21 SQM mag and or avg to poor trans and the view is killed, observable yes, great view no. The 10BCO/Paracorr showed M57's central star with ease- a very good sign. In summary the Paracorr II in the 24" f4.1 dob worked really well. It seems to up the contrast on nebula in particular and doesn't seem to impact galaxy views but more time on this is needed. The 21E came into its own with this device, I was rocked back by the view on the Veil. BTW I have a 17E, 17 Nikon HW to compare to with no Paracorr... The sky was 21.5 mag with avg trans that worsened with time.
  16. I'm curious how NV does on some of the small unusual galaxies Gavin, ARP's and Hicksons- I viewed a strange little galaxy, kind of worm like with knots in it at high power, forget the name right now but very interesting. have you tried observing some of these objects with NV? I checked, it was ARP 81
  17. I think both technologies offer pros and cons- are there things like reflection nebula that NV suffers a bit or others?
  18. This is a VG sign, and seeing it no filter is a great bonus. Congrats for a great night with the 20"! Try that scope on IC1318 near Sadr.....
  19. Perfect Iain! Well the cats out of the bag now... this object and ones like it are a major reason I bought the 24". I'm fascinated by Einstein and other great minds like his. I want to see this classic example of light bending around the galaxy in warped spacetime and this really hits to the heart of why I'm a visual observer- I want to see it with my own eyes. I have zero expectations to see this, I only hope I can get a glimpse of at least one image, "A" perhaps. Experienced DSO observers say 2 might be possible in the 24" and one very experienced one said "you never know, you might get them all". Orthos are my only hope I think and I need the unusual combination of excellent seeing with excellent transparency. This object will be my primary target for as long as its in a good position to view.
  20. My plan is to locate the lensing galaxy, PGC 69457, 14-15 mag hopefully with the Docter 12.5mm UWA. If successful I will re align the Sky Commander on it and then try the 10mm BCO. Next will be the 10BCO/VIP @ 1.5x then 2x with both 15mm extensions. I have a VG 7mm KK ortho which will also be enlisted. Plan B will have the Paracorr in place with a Delos possibly- sure wish I didn't sell them now... When using the Sky Commanders realign option I can get back on target using a .14 deg tfov. Mags will be 200x,250x,372x and 500x.
  21. The Paracorr II should be delivered the end of next week and as Piero says I could really use the aperture stop for the Glatter laser. An interesting thing to try is de collimating a newt in small steps to see what happens through the eyepiece.
  22. How dark are your skies? The very best thing to do is get to truly dark, transparent skies- what eyepiece did you use?
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