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ee001

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About ee001

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    Nebula
  1. Hi, What is the best way of attaching wheels to a 12" Skywatcher Dobsonian? I have never done a DIY upgrade before there doesn't seem to be any pre-made upgrades. Many thanks for any advice.
  2. Thanks everyone for your advice. Next time I have a chance to observe I will take into account what you've said. The weather will be cooler as well so hopefully seeing will be more ideal.
  3. As those who have read my initial ‘Welcome’ thread will know I bought a Skywatcher Skyliner 300P Dobsonian back in June. I then took the telescope to southern Turkey (clear skies!), my home country, where I spend my holidays every year. What follows is a brief report of observations made over two months, during July and August. Before each observation I checked the collimation with a Cheshire. Saturn and Jupiter (11mm Televue Plossl + 2x Barlow): Unfortunately the rings of Saturn were edge on. On the surface of the planet I could see a lot more detail than my previous 4.5” reflector. Jupiter was more impressive. I could definitely see a lot more surface details/more cloud banding than I ever could with my previous instrument although I could not make out the red spot. Hercules Globular Cluster: This was a magnificent site, the first time I observed a globular cluster. All the stars were sharply resolved. I came back to this time and time again. Ring Nebula (11mm Televue Plossl + 2x Barlow): I could clearly make out the ring shape but no other details. I could not make out the central star. Dumbbell Nebula (11mm Televue Plossl): This simply looked like a faint ball of cloud. I could not really make out its true shape. M81 and M82: My first galaxy observation. Quite faint and fuzzy. Apart from the general shape I could not make out any details. Whirlpool Galaxy: This was a disappointment. I was led to believe that with a 12”aperture I would be able to make out the spiral structure. Instead I could hardly see anything! I could see the brightness in the centre and the edge but apart from that I could only just about make out the main body of the galaxy. It was definitely a lot more fainter than M81 and M82. Viewing conditions: Sky was reasonably dark but not inky black. I could just about make out the milky way. Seeing was not ideal; I could see some flickering around the edges of the planets for example. So as you see a brief first report. I would like to ask for some advice on how to improve my observations, particularly galaxy observations. Do you think the sky was not dark enough for galaxy observing hence my disappointment? Would using a filter give a significant improvement? What about nebula filters? Would they enable me to see colour in the nebula? Thanks for any recommendations, Eralp
  4. I just read astro-baby's collimation guide and watched a video as well. From the video I got the impression that turning the centre screw moves the secondary up and down which would mean tightening it would change the mirror position as well. However, from your comments this is my understanding: to adjust the secondary mirror position along the tube I loosen the centre screw, move the mirror up or down as necessary and finally whilst holding the mirror in the correct position tighen the centre screw to make sure it doesn't fall. Is that the way to do it?
  5. Am I right in understanding that it is the smaller 'tilt' screws that secure the secondary mirror in place? It seems the centre screw simply moves the mirror up and down. So as long as the three tilt screws are tight there will not be a risk of the secondary mirror falling off? For obvious reasons it is important that I get this right before starting. The scope is a skywatcher dobsonian. Thanks
  6. I just had a chance to try this out and I must say what a great find! It answers my initial post but as you say has many more uses. Thanks a lot.
  7. Thanks for that. I should have had a better look the first time round!
  8. Does anyone know the link which does strips as well?
  9. If well made how accurate would a set-up like this (http://stargazerslounge.com/diy-astronomer/80995-diy-dob-setting-circles.html#post1229286) be in azimuth? Within 1-2degrees? I'm sure Doc's set-up is more accurate but it also seems more complex.
  10. I was interested in these as well (although I haven't had a chance to observe any nebula- with or without filters). So its not just aimed at those experiencing heavy light pollution? Because I have pretty dark skies as well.
  11. Doc, This is the thread I found http://stargazerslounge.com/diy-astronomer/80995-diy-dob-setting-circles.html#post1229286 (mine is a Skywatcher as well). If I were to make some myself I would prefer to go for the easiest option and this seems like it. I Does yours use the same principle?
  12. As far as I know in NMS all sensors are in box and unlike RMS its not affected by ferrous materials. I did come across the thread describing using a wixey along with a home made azimuth setting circle but I'm not sure if that will be as accurate. Also I'm not sure if that's going to be practical in the dark and with a 12" dob.
  13. I'm going to order this in the very near future so if there are users out there your opinions will be much appreciated. I'm thinking of getting the NMS version.
  14. That was very helpful, particularly the fact that it gives the size of each object. Thanks to all of you.
  15. I'd like your opinions on what sort of 'true field of view' I should be looking at when observing DSO, particularly galaxies. For example, with my dob an 11mm 50degree eyepiece would give a true field of view of 0.4degrees and a mag of 139X. Is that too narrow/too wide? Is there a way of finding out how much of the field of view different objects occupy so that I can decide which eyepieces would serve me best? Thanks
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