Jump to content

30 secs banner.jpg

Leaderboard

Popular Content

Showing content with the highest reputation since 04/06/12 in Blog Comments

  1. As requested, a photo of the finished clock. I'll be adding details of the construction shortly, copying relevant excerpts from my rather long thread in the DIY Astronomer forum. It's not really a blue moon, it's lit with a white LED but the digital photo has coloured it blue
    8 points
  2. Always nice to see a bit of proper science. If youre interested another quasar is up for grabs now, just as distant (~8bly). If you havent already imaged it, its the twin quasar: The edge on spiral is NGC3079, really useful as a pointer to your target. Its also a great example of gravitational lensing.
    7 points
  3. I have to say I almost entirely disagree with your 'ultimate guide' for beginners! All the telescopes you 'recommend' are very small aperture and in the main come with lightweight unstable mounts that will do more to frustrate the user rather than give them a good start in observational astronomy. For visual observing, aperture counts. The larger the diameter of your objective, the more light you gather on deep space objects and the more resolution you have on solar system objects. For the budget conscious beginner, by far the best bang for your buck comes with a Dobsonian mounted Newtoni
    7 points
  4. This is a starting point. To date I haven't managed to print an accurate enough escape wheel but I have made improvements to my 3D printer recently so I'm ready to have another go.
    5 points
  5. Half round file Stu- one with fine teeth and gently and patiently- very easy to catch the edge and bend it. Here it is in the spider- I’m about to fit it to the tube- hope I didn’t mess up any measurements
    5 points
  6. Hello Gina I did a presentation to a Scottish Photographic Society a couple of weeks ago - Powerpoint based. Its attached - feel free to bin it, rip it shreds, do anything you want with it. I dont get prissy about copyright of my images etc - feel free to use any images you might want etc etc. All the astroimages are mine and the none astro ones are all copyright free. Astro Imaging presentation.pptx
    5 points
  7. I'll start with some photos of the observatory taken a few years ago. From the north looking roughly south and then from the south at various angles.
    4 points
  8. Following getting my 3D printers confused in Firefox and changing settings on my Mini printer, which was printing the bed clamps of Concorde, instead of the Concorde web site and messing up both print and Mini printer, I decided I'd print the parts on Concorde. So now I'm printing the second bed clamp on Concorde itself. Hence I now declare Concorde as a working printer even if it isn't finished!
    4 points
  9. Pond filled. More back filling with soil. Now having a rest! Some photos.
    4 points
  10. It's empirically verified that the speed of light in a vacuum is a universal constant, independent of reference frame. There is no analogous principle for sound waves. Hence one cannot attempt to reframe special relativity using sound, or any other form of energy transfer apart from radiation.
    4 points
  11. 3 points
  12. Moved it to D6- that did the trick. think it should be strong enough 30D8DFF2-43AC-478B-AA75-B980CEC1CC78.MOV
    3 points
  13. Hi Gina, I did a lot of professional public speaking in my career and have couple of thoughts based on what you have said so far. Given this audience is not astro people - I think I would first engage their interest by first talking about something they will understand - terrestrial photography. Hence, describe how a DSLR camera works first. Hence; reverse thes two slides Explain how terrestrial images are typically done with short exposures and how that works fine. Then explain that longer exposures and adjustment to ISO are necessary to capture enough light for evening pictur
    3 points
  14. Finished clock except for the motor drive unit - tested with a DC motor-gearbox. Arduino Nano arriving tomorrow. The one I had was faulty.
    3 points
  15. Here is a photo of the lampholder and LED bulb (G9 base). There are two fixing holes 0.5" apart (12.7mm) a bit bigger than 3mm (probably 1/8" = 3.175mm) so M3 bolts will suffice for fixing (one is shown in the photo). The LED bulbs are 4W, equivalent to a 40W GLS bulb and 5 of them will give plenty of light. They are the dimmable variety so I will be able to reduce the light output for watching television.
    3 points
  16. Went out this afternoon and had a good look at the area to determine where to put the new "pond" and fountain/water-feature. There's a wide view through the picture window in the living room so decided to put it away from the other pond and bird feeder between the new micro observatory and main one. Started a bit of planting round the naturalistic pond too. Some photos from indoors as it's raining.
    3 points
  17. Taken from living room window. Pond is level - ground slopes. So does my bird feeder - must re-plant that upright ? Another lovely sunny day with a few clouds about. I'm doing what I can before it gets too warm - 23°C forecast for today. Stopped for a mug of coffee ATM.
    3 points
  18. And if it doesn't you can always use it for waterskiing ? James
    3 points
  19. Print finished and looks virtually perfect. Printing time 1h 23m. The 300mm steel rule shows the scale. That print is BIG!!
    3 points
  20. 3 points
  21. Congratulations on your new mount. I am sure that you will soon get used to the set up and it will become second nature. A lot of folks are using these Polemaster thingies now for polar alignment. I know exactly what you mean about storage. You may find these azimuth bolts awkward when storing too. However, there is a simple solution to the storage problem. It inolves building a shed in the garden with a roof that rolls off ..... well ... you know the rest....
    3 points
  22. Hi Mountain Skies Your blog is an interesting personal point of view on starting out in astronomy and I think you make some useful points. Personally I don't agree with you regarding getting a cheap refractor as a good first scope. A nice little Newtonian on a decent tracking mount (EQ5 for instance) or on a Dobsonian mount would be my preference. Regarding your comment "The biggest problem you hear in astronomy is that someone got a big 1000 dollar telescope and hated it and stuck it back in his/her closet." Whilst people having "all the gear and no idea" can be an issue, from my
    3 points
  23. 2 points
  24. Thanks! I forgot to mention we had our Bichon Frise as well....easily confused with the sheep?
    2 points
  25. Brilliantly written David. Reminds me of my last holiday in the Lake District where there were really dark skies too, and like you I had a car full of not only my family and luggage; but Wiggins our dog too! I don't have a smaller travel scope so couldn't take anything with me, although I wish now I'd just taken a pair of binoculars. The skies were brilliant, and just like you mentioned, I remember standing out in a field staring up at the skies just making out all the constellations, until I heard the eeriest loud noise I've ever heard. I can only assume it was a fox, but it was so
    2 points
  26. Butchering an old web cam? Thats the spirit! Looking forward to seeing the results. Yes. Something to hold the phone in place helps. There have been loads of threads on this over the last few days. I think that one cropped up for sale the other day in the classified section. I’m attempting a home made solution.... Paul
    2 points
  27. I have decided to get the ZWO ASI 120MC-S from FLO. I feel a bit "lost" without the ASC image to look at! If this camera turns out not right for my ASC I can use it for planetary imaging later as I have in mind. My standard widefield imaging rig is taking priority though.
    2 points
  28. ZWO ASI 185MC or 385MC have a coverage of 7.26mm x 4.11mm. ASI 120MC has a coverage of 4.8mm x 3.6mm. That is 87.6% of the height of the 185/385. This is not as bad as the diagonal sizes would indicate as the 120 has a narrower X to Y ratio. Here are a couple of screenshots of the two image sizes. First is the image from the ASI 185MC and the second the same image cropped to the size of the ASI 120 image sensor with the original size (185 camera) shown as a dashed box. The loss of coverage is far less that I anticipated and seems acceptable
    2 points
  29. Indi can control DSLRs via gPhoto https://indilib.org/devices/ccds/gphoto.html
    2 points
  30. Umbilical support bracket. I'll explain how this will work later. This shows the print quality I'm getting from Concorde. Printed with a 0.8mm nozzle.
    2 points
  31. Now if only I can solve the XY drive problem. Maybe try the 60mm long NEMA17s though the 48mm ones I'm using worked fine in my Giant printer. Tried increasing motor currents to 2A (they're rated at 2.5A) and now have some X movement albeit with much "grumbling"! Next test... Swapped the 48mm NEMA17s for 60mm ones with current set to 1A (rating 1.2A), r4eversed the drive for the RH motor and the X and Y drives are now working fine ? Some noise on slewing but considering they're mounted on a gert big sounding board, that's not surprising. That's with a slewing rate of 100mm/s in X
    2 points
  32. The whole gear train except for some of the bearings and axles.
    2 points
  33. Gina! We spend so much time complaining about the rain and cloud, and now you're complaining because it's been too sunny! James
    2 points
  34. Started putting the new plants round the pond but then my brain got into gear and I thought "how do I mow the grass and not the flowers?". Oooops. Maybe I was a bit premature buying plants. I may build some raised beds for planting but that will be a fair bit of work and won't get done very quickly. Goodness me, I'm green at gardening and not in a good way!! ?
    2 points
  35. Messing around with different stretch functions I came across one that gives a very direct visual meaning to stacking subs. This is exactly like the pile of acetates I used to prepare my classes on... Interesting to see that a median stack destroys the effect completely: It makes sense when you think about it, but all the same I was quite surprised at the difference in information content between these two ways of combined subs (at least at the edges where it is most noticeable since the number of subs contributing varies).
    2 points
  36. Assembled dome and casing top etc.
    2 points
  37. Actually, the rain stopped and the sky cleared a bit just before midnight and I was able to capture an image a couple of seconds before midnight and another 3m into 2018. There are a few raindrops on the lens. HAPPY NEW YEAR everyone
    2 points
  38. FURTHER THOUGHTS I've been finding a few problems with Raspbian as the Operating System and now looking at Ubuntu Mate which has some advantages and would seem easier to set up but have to see. I may produce another Tutorial using Ubuntu Mate instead of Raspbian.
    2 points
  39. Redesigned and printed a new lens support. Definitely better Focused on a distant light. Focus not perfect but not too bad - I think I'm learning a new skill The moon is 98% full and about as bright as it gets yet it is possible to see a few of the brighter stars - it was hopeless with the dome! Mind you a new non-yellow and clear dome should be better than the one I was using. I can see two red hot pixels and maybe a green one 0 blue ones might not show. A dark would eliminate those. I think I can make out about a dozen stars Here's an image taken with the ASI178MM to sho
    2 points
  40. Skirt and lens tube extended and taper increased slightly to improve clearance.
    2 points
  41. I am wondering if FLO will have to upgrade the Stargazerslounge servers to keep up
    2 points
  42. This is what I play my vinyl (33's & 45's) on... a Michell Focus One. note: photo for illustrative purposes only. I am in the process of re-arranging my Hi-Fi separates. My most recent vinyl LP purchase was 'Rosetta' by Vangelis. I have yet to play it.
    2 points
  43. For extending the bass response this would do me nicely :- The Epicenter 500 Subwoofer
    2 points
  44. One of the problems with the perpetual calendar mechanism in the longcase clock was that the cams and gears were on top of each other and some of the workings were obscured. This can be seen in the photos below. In the separate calendar unit I plan to spread things out so that everything can be seen.
    2 points
  45. Or should I have said "Clever cogs" ?
    2 points
  46. That title confused me, was expecting this Dave
    2 points
  47. Absolutely right. In addition the speed of sound varies even within an inertial frame, it changes literally with the weather. Regards Andrew
    2 points
  48. I use to work from an EQ3-2 that I bought with scope bout 3yrs back the alli legs were ok if that, problem I had with it was the plastic parts that go into the top of the legs that were then screwed from outside of leg to hold in place then attached to plate at top where mount sat, the screws just kept working loose which then caused it to not tighten up an also the plastic parts snapped on 2 of the legs so had to find replacements as gluing wasn't gunna help. upgraded to EQ5 legs an was almost a different mount so much sturdier was just getting into AP then think I was upto 60 sec subs unguid
    2 points
  49. I tend to agree with you re: the aluminum tripod being a really weak link. I had an EQ3-2 mount once that was fitted with an HEQ5 tripod (1.75" steel tubed) and it was like a different mount altogether. It carried a 120mm F/8.3 refractor well for visual observing whereas it was jelly-like with the alu tripod. A nice hardwood tripod is even better but I guess it's too much to expect mass-production mounts to be supplied with those !
    2 points
  50. nice vid you should have used this Pat
    2 points
  • Newsletter

    Want to keep up to date with all our latest news and information?
    Sign Up
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.