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Showing content with the highest reputation on 06/01/13 in all areas

  1. I've posted this before from time to time but not for a while. The illustration below is adapted from something the US company Orion use to show the comparative sizes of dobsonian scopes. There is a little variation from brand to brand but it's broadly accurate I feel. In terms of overall weight it goes something like: 6" dobsonian = ~34 lbs / 15.5 kg 8" dobsonian = ~40 lbs / 18 kg 10" dobsonian = ~55 lbs / 25kg 12" dobsonian = ~ 83 lbs / 37kg Might be of interest to those considering upgrades or first scopes They always look bigger than you expected when unpacked and assembled in your living
    5 points
  2. If you've noticed that Yves and I have gone quiet, the reason is simple; we've been working on M78! Don't get started on this if you have plans to image anything else over the winter months... It takes ages at the best of time but we've also had bad weather, flats hassles and a strip down to clean the chip window. We seem to have found a flats formula that works (after trying for a year!) but the dirt caused us a lot of lost subs. I'll have you in tears, eh? I can't remember what's gone into this so far but it's about 18 hours and we are now planning more 30 min Luminance subs which work very
    5 points
  3. Greetings, happy new year to you all! Here's some reasonable drawings of Jupiter made in perfect conditions! Strangely, we had a late clearing on 3rd January and the seeing was superb for many long periods of time. I was able to examine the disk and satellites at x400 and record an above normal amount of detail. Alas the clouds rolled in at 2316UT, but I was more than happy with the night's work (though a full rotation would have been excellent). By the way, if you don't know, the next two Sky at Night programs after tonight- will be looking at the Sun in February, and in March we shall be
    5 points
  4. Got a night of clear skies so decided to grab some Ha on the Horse head area This is 4.5 hrs 30 min Subs with 5nm Astrodon filter and the Pl16803 and Tak 106 http://upload.pbase.com/t_total123/image/148183512/large Les
    3 points
  5. Very hard to capture as it was boiling all over the place and at low altitude.
    3 points
  6. One problem with larger aperture telescopes is that along with being able to resolve more detail in an object, they also resolve more detail in the turbulent atmosphere. They are more affected by rough seeing conditions than smaller telescopes. I am geussing here but I expect your Dob is f/5 or faster. This isn't going to give you as much contrast as the 4se at f/10. Assuming the mirror coatings and figure are in good knick, I doubt there is anything wrong with your Dob, it is just not the right tool for looking at planets. Though for deep sky objects like galaxies and nebulae, it should eat t
    3 points
  7. While out at the club's dark site my club buddy Lars informed me of this little object. It's my first proper comet with my own equipment. Just been a eyeball observer up until now. Here are some 30sec shots at ISO6400 plus an animation with roughly a minute or a little more between frames as I shot this without a timer remote. The bright star in the first picture is Elnath aka Beta Tauri.
    3 points
  8. Just to clarify - that's a different Pete to me (I'm Pete Lawrence btw), but the sentiment is the same. The next Sky at Night will be broadcast tonight (Sunday, Jan 6th) at midnight - details here: http://www.bbc.co.uk...rammes/b006mk7h It will be an emotional show for all of us but Patrick wouldn't want us moping about. He'd want us outside enjoying the stars (weather permitting!) and pushing forward the subject he loved so much - astronomy! If any of you are doing, or have completed, the Moore Winter Marathon - don't forget to send your completed forms into the show. Details of the Marathon
    3 points
  9. I think we should call that John's First Law of dobsonians: They always look bigger than you expected when unpacked and assembled in your living room. And much bigger than your partner expected
    3 points
  10. I have considered the question of what a person needs in his eyepiece kit, as a bare minimum, for quite a while. Personally, I don't have a lot of disposable income, and I recognize that a lot of amateur astronomers are getting along on a shoestring budget. So, if you can afford to go out and buy a full set of Naglers, or even Radians, go ahead, this article isn't for you. It is for those of us who have to choose between a new eyepiece and a new spring jacket, and are already garnering disapproving looks from our partners for buying that natty little refractor at a higher price than they reall
    2 points
  11. Just bought one of these: Orion StarShoot USB Eyepiece Camera II 52183 For £4.99 from local Cash Converters- I don't think they knew what it was!!! Still £69 elsewhere I see. http://www.scsastro....ra-ii-52183.htm EDIT- plugged in & working!!!
    2 points
  12. I've just noticed this posted by Pete in the Sky at Night Flickr group in response to a question about the future of the program without Patrick. Feeling sad just reading this really, going to be a hard episode to watch without a lump in the throat I think.
    2 points
  13. I saw the sky was clear so had a quick go at Jupiter. There was faint cloud passing by though so I didn't try for long. Seeing was best I had so far, but still not great. At least there were some periods when it wasn't moving too much. The three captures were taken less than 5 mins apart, so this 3 frame animation stretches less than 10 minutes. I knew it moved, but I didn't know it was that much! DFK21AU618, Bresser 3x barlow, Meade 8" SCT. Stacked in AS!2 and wavelets by RS5. Animated in Jasc Animation Shop if anyone is old enough to remember that... I'll have a play with WinJupos later and
    2 points
  14. Just came across this video giving a comprehensive tour of the inside of the space station here for those interested. Quite amazing what is up there now with all the additional modules now in place and I think I would need a SatNav to get around it all - very disorientating. Certainly not a place to move around in if you are physically of a rotund design or if you are concerned about how your hair looks. :grin: Apologies if this has been posted before but is certainly worth a look! Clear skies James
    2 points
  15. Hi all , I thought I would share with you all the mount I made for my 'Viewlux' 8x56 binoculars . These are a very good pair of binos , sharp and very well made , Japanese quality . I was in the local ' Cash Converters ' ( 2nd hand shop ) here in Darwin a while ago and grapped a horrible alt/az 'bushnell bushmaster' 60mm refractor for $20 , it was real sad ! I donated the lense , focuser and finder to a friend in Romania ( yea I know Romania is a long way from OZ it only cost me $25 in postage ) and that left me with its light weight tripod and alt/az head , hmmmm , what to do ??? what to d
    2 points
  16. Frédéric Tapissier has recently uploaded a new European set of light pollution maps. Might be useful if you're planning a vacation. http://www.avex-asso.org/dossiers/wordpress/?page_id=2754
    2 points
  17. Latest picture of jupiter
    2 points
  18. Only just got around to stacking/processing this. Quite happy to have all 4 Galilean moons visible as well as the GRS. While everyone was counting down, I was fiddling with my focus knob, sad or what Canon 7D with Canon 500mm f/4 L IS with stacked 2x and 1.4x teleconverters. Live view recorded in BYE and stacked in Registax. I think this about as good as I can get out of my current kit.
    2 points
  19. This pic was taken by a previous owner, it has a light shroud, it also has a round wooden cover for the mirror when its getting built, stops anything hitting the mirror. Thanks to LG for the pic.
    2 points
  20. Charcoal pocket warmers, available in ebay. Gary Sent from my HUAWEI U8815 using Tapatalk 2
    2 points
  21. The OOUK Dob bases have a smaller footprint than the SW or Orion USA circular ones. They are very nice indeed but do cost a fair bit more though.
    2 points
  22. If your not experienced in removing and seperating a crown and flint, leave well alone, if you bought it new send it back for a replacement
    2 points
  23. I suppose if we really wanted to depress ourselves, we could overlay the light pollution map with a cloud cover map.
    2 points
  24. From the album: Comets

    A comet that was lurking Auriga on the 4th of Januari I was out at my clubs dark site.
    2 points
  25. Hi Richie and welcome, you do know that to be able to post here, you have to strip down to your undercrackers and run through Southend with a red light torch on your head. We have all done it
    2 points
  26. I've spent the last week buying the odd thing which I'd been putting off getting asking myself 'do I REALLY need this right now', now that the B Cox affect is nearly upon us the answer to that question is YES!!!
    2 points
  27. Rather than another software package, perhaps what you need is a step by step sort of workflow.I don't know if you've seen this, but this is an excellent video walkthrough which takes you through many stages of processing a DSLR image in Photoshop. It's quite lengthy, so it's worth setting aside some time for it, but it's definitely worth giving it a go. http://www.astronomersdoitinthedark.com/dslr_llrgb_tutorial.php#Introduction Hope this helps
    2 points
  28. I think this is a great effort, well done! Stick with it.
    2 points
  29. Well, I'm overwhelmed with all the replies. Thank you all very much indeed. There's some extremely useful and interesting information in there that's been an enormous help. All things considered, it's now 100% clear that I should purchase the 200p. As enticing as the bigger scope may appear, the overall money burn is going to be too steep. It's more for the telescope, disproportionately more for the EPs; I think it's a little too much, too early. The key point reassuring me in your replies is that the 10" (with standard EPs) is not necessarily better than the 8" with upgraded EPs. I use
    2 points
  30. This is the first light image from my ASI120MM: Due to the poor weather I have not had as much time with this camera as I would like, but I already rate it higher than the DMK/DFKs with the 618 chip (which I also own). Cheers, Chris
    2 points
  31. The semi-Apo filter actually works by filtering out the violet fringes around stars caused by achromatic lenses, in the same way the Baader fringe-killer does. There's so more info here: http://www.firstlightoptics.com/achromat-semi-apo-filters/baader-semi-apo-filter.html It does mention the semi-Apo has a Neodymium substrate, so it's possible it's pretty similar to the Neodymium+fringe-killer, although the quote on there suggests the semi-Apo has less colour-shift and better CA reduction.
    2 points
  32. There is a lot to be said for a scope that can be setup and put away quickly with our variable climate. My smaller scopes get a lot more use than my largest. A more compact scope is sometimes easier to get out to dark skies too. My 6" under really dark skies showed deep sky objects better than my 10" does from my moderately light polluted back garden.
    2 points
  33. As much as the conventional message is 'aperture, aperture, aperture', I'd personally argue that there's a lot to be said for better and more EPs sooner - Especially in a case like this. You see, there is 0% chance that the standard EPs are going to get you anywhere in this hobby. For one, they're at best, barely adequate in quality terms. For two, they're too few. You cannot view all the objects that will interst you, with magnifications provided by the two standard EPs and barlow. So, more EPs are ipso facto. You WILL need more EPs and £30-50 per EP will deliver 90% of the best views you can
    2 points
  34. No off the shelf scope with standard EPs is likley to outperform a slighlty smaller one with better EPs in my opinion. The standard EPs with almost every off the shelf scope out there are pretty dire. The 200p with decent EPs is a totally different proposition from a 200P with standard supplied EPs. But..and its a big BUT much depends on how much you want go blow on EPs because the sky is the limit. As your talking DSO I would magine you would want a solid quality widefield. You could look at an ES 30mm 82' plus you would need some EPs in say 15mm and 10mm ....you could look at the ES 82' r
    2 points
  35. HI all, Just joined this forum as have got my first telescope (Meade ETX 125 - Christmas pressie from my wife!)... Getting used to setting it up and I took it out last night for my first session and I was entranced by Jupiter and it's moons... Have the standard 26 mm eyepiece and a 2 x Barlow so far. I am based in north Surrey (near Leatherhead). As a bit of a tweaker, I am already thinking of changes (need to have some better method of focusing) and have some ideas on that. In the mean time I will be browsing the forum and picking up tips Geoff....
    1 point
  36. Hi Hello my name is steve......been interested in astronomy for 25 years ..hope to learn new things and meet new stargazers
    1 point
  37. Purchased first scope today - Celestron 6SE after deliberating for some 2 months. Decided to show the Mrs a picture of said scope this evening"..I thought you said it wasn't that big !!" I explained it was only 16" long and 6" in diameter and perhaps the picture was misleading you, dear. "..I don't mean the orange bit, I mean what are those 3 long silvery bits, you didn't say you were getting those as well". That's the tripod, dear. Did you expect me to view M42 just holding the telescope by hand? "..I'm going to bed". Night, night, dear. Don't you just love 'em !! Wonder what her reaction
    1 point
  38. The Zhumell 12" is the same as the Revelation and Telescope Services 12" F/5 dobsonians. GSO optics and mirror cells. If it's cooled properly and the seeing conditions are not awful it should show good detail on Jupiter. What test have you done to show that that the collimation is accurate ?
    1 point
  39. That, my good man, is my kind of ghetto mod and I'm so trying it...
    1 point
  40. Or this but its more expensive http://www.365astronomy.com/dual-speed-110-microfocus-upgrade-for-skywatcher-crayford-p-2484.html
    1 point
  41. This was taken from Celestrons web site. When you look at your equatorially mounted telescope, you’ll notice dials on both of the axes of the scope. These graduated circular scales are the setting circles and are used to measure or set the pointing angles in the right ascension (RA) and declination (Dec) coordinates. The following instructions are generally applicable for our German equatorial mounts as of 2009. They are very similar for many other equatorial mounts as well. To use setting circles, first make sure your finderscope is aligned with the main scope and that your mount is polar-ali
    1 point
  42. If needed, a slight focus adjustment on each isn't too bad in a wheel, but the added time to swap filters when not in a wheel is just too much. I don't need to adjust focus with my Baader set, but some sets do need adjustment from R to G to B.
    1 point
  43. You've done extremely well for a first attempt This is a notorously difficult image to process. In fact to keep the inner core trapazium stars and still get the outer dust clouds you need two sets of data at different exposures and blend them together.
    1 point
  44. From the album: Comets

    A comet that was lurking Auriga on the 4th of Januari I was out at my clubs dark site.
    1 point
  45. Messier never had an interest in DSO's so drop that bit of the arguement. He was a comet hunter. Why some are in I have no idea, M45 is pretty obviously not a comet to me at least and my eyes useless. The galaxies are a fair set to include they have a size so could be a comet early on. Equally comets are "fuzzy" that tail makes them an odd shape. Much was I suspect a list of objects that he could reference when some well meaning idiot said they have seen a new comet in say Orion, just below the belt. Look it up and tell the idiot they were an idiot. As in Dear idiot I know there is something t
    1 point
  46. I've got clear skies outside. Wasn't expecting anything so medicated my cold with whisky. Consequently the view through my binoculars is not especially crisp.
    1 point
  47. Hi Josh the image you see regarding any halo is as it was straight out of the camera , the glass seems to be very good in the scope
    1 point
  48. Or even Lyra vs Tal 100rs vs 16" masked to 100mm? I think Qualia's plan of a SGL/'Frac fraternity' star party in Spain is a good one myself, oh and he also mentioned something about Mojitos?
    1 point
  49. I went in to great lengths some time ago whether flocking is really worth it (mainly due to the cost of protostar flocking and having to import from the U.S) and now I am flocking mad about the stuff. Every scope I have ever owned has benefitted from it and now a suitable substitute has been found for protostar at a fraction of the cost I would recommend it to anyone. The improvement is always going to be subtle but every subtle improvement you make adds up to a greater improvement over a stock scope in the long run.
    1 point
  50. For the budget you have suggested, I'd recommend, save up a little more, and get an HEQ5 Syntrek. The just mount your camera and lens directly to the top. That'll certainly get you going widefield. Lenses up to 400mm will work nicely. (400mm is just about right for M45 and M31) and other targets. In the meantime, have a try with some widefield work with a short lens and a tripod. It's all good experience, at both operating the camera in this mode, focusing and processing, each is a new technical challenge, that needs work. If you fancy having a view around whilst your camera is doing it's stuf
    1 point
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