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Showing content with the highest reputation on 21/10/13 in all areas

  1. 6 points
    Hi all I thought I would post this image of M76 the little dumbell nebula in perseus. it was imaged over the 5th/6th of october in very damp atmospheric conditions,all subs were binned 2x2 through a baader Ha filter 7nm. thanks for looking! scope - C11 camera - atik 314l setpoint -10 mount - Neq6 filters - baader Ha Subs - 50 12mins Binned 2x2
  2. 4 points
    This is a 6 panel mosaic so the fullsize would be ludicrously enormous and, since my CCD camera had large pixels, it would look quite blocky. The intention was to go deep and get small stars and a final image around this size http://ollypenrice.smugmug.com/Other/Best-of-Les-Granges/i-V9SQcqS/0/X3/ORION%2085MM%20LENS%20HaOSC%206%20PANEL-X3.jpg, where the pixelation doesn't matter. (You could do this in a single frame with a 50mm lens but you wouldn't get the small powdery stars.) The basic image is about 55 hours in HaRGB. The big advantage is the Ha, very efficiently captured in a monochrome CCD. To get this in any OSC camera would take a long, long time. Olly
  3. 2 points
    Hi What are you like with tools? I ask because a project like this, could really be what you're looking for. http://www.garyseronik.com/?q=node/37
  4. 2 points
    As for reason or purpose Paul, Despair not. "Show the slightest preference for this or that, and heaven and earth become infinitely far apart." And, "The more you look for truth outside yourself, the further away it gets." It may be that what is "real" (a deeper foundation of "reality") is more mental than physical. Galileo and Pythagoras said God is a geometer, Max Tegmark thinks the universe is made of numbers, Gerard D'Hooft won the Nobel for showing that any objects information (in quantized bites) has to fit on the surface of it (at Planck scales)...and none of this precludes the universe from "mentalizing," from giving itself meaning and purpose, even if it's only doing it through such as us. This dewdrop world, It may be a dewdrop, And yet, and yet...
  5. 1 point
    This is definitely a good news day The Skywatcher Esprit-80 and Skywatcher Esprit-100 triplet refractors are both scheduled to arrive here in the UK and be ready for dispatch "within two weeks". We don't yet have an official price but are expecting the Esprit-80 to retail around £1100-£1300 and the Esprit-100 around £1700-£2000. An official price will be released soon. Both models will be supplied with a 9x50 RA erect-image finder-scope and a 2" dielectric diagonal. The 80mm has a mounting shoe and the 100mm is supplied with tube-rings and dovetail. Separate dedicated flatteners will be available for both models. When used with their flattener the Esprit 80 will have a 33mm field coverage and the Esprit 100 40mm (the Esprit 120 & 150 cover 44mm).
  6. 1 point
    Hello ! I started a new photo session for Jupiter.
  7. 1 point
    I just watched the sky at night bbc4 version and they read out a question from me. Phil parry from north wales.read out by lucie and answered by chris north.
  8. 1 point
    Hi Steven and welcome to the forum. Clear skies James
  9. 1 point
    From reading this site no one scope is perfect for everything. What is the most important criteria for you such as weight and what you want to see best The best scope is the one you can take and use and somewhere I read something about what a dark site means in aperature gain figurativly
  10. 1 point
    I haven't told him yet Jake, I like Tinkers Idea. I'll work out the costs for doing it at this stage. It may well prove cheaper than having to fill the son in law with lager before, during and after the dig. Its been lashing it down here all evening I havent even been out to the Orangery tonight to start undercoating the frames.
  11. 1 point
    Sorry for not replying sooner guys but I have had an absolute stinker of a day I do like to respond to all threads in posts I start but 13 posts in one hit is too many for me It has been a long time but as Calvin says hopefully November may be a tad kinder to us all Qualia you do have a marvellous way with words, always comforting and very well versed James, Steve, Mike, JB, Mike, Rob ,Shine & Roger thank you for contributing to the thread. Maybe we will all get a well deserved weather break soon
  12. 1 point
    Looking at the floor, make a pier with collar or legs and bolt it to a thick sheet of exterior ply and bolt the sheet to the floor. The ply base can be made to any convenient shape, square, circular, hexagonal, octagonal. You could champher the edges to lessen the chance of a trip hazard.
  13. 1 point
    This is my own version: http://stargazerslounge.com/topic/122340-a-homemade-freestanding-pier/page-3?hl=%2Bfreestanding+%2Bpier#entry1690941 Still in use and it works very well. Total cost was reasonable too!
  14. 1 point
    Have seen someone with the same problem. Basically make the pier as you would normally to put into the ground, but instead it was put into a bin which was then had concrete poured into it. Believe me it weighed about half a tonne and was never going to be moved in a hurry. This should give you more room to move around and if it's just for visual use should be stable enough. Hope this gives you plan Sent from my iPhone 5 using Tapatalk - now Free (I like free)
  15. 1 point
    I tried less voltage to make it dimmer and it didn't work at all. So I dismantled it and the glass is made up of a piece of opal and a piece of acrylic with diffuser lines in it. I put a thick piece of paper between the glass and acrylic and its a lot dimmer now. Just need to try it out when I get a minute!
  16. 1 point
    The skywatcher 250px flex tube top scope and folds away well Sent from my iPhone using Tapatalk - now Free
  17. 1 point
    FireCapture is a bit overwhelming to start with, but the online manual is pretty good. if you've got it working with SharpCap now though, that's exellent. James
  18. 1 point
    Strangely I take comfort from this. I read recently something I hadn't given too much thought to even though I'm a dog lover / owner. It may have been on one of the more off-topic threads here on SGL that someone said that we only see a reflection of our own emotions in a dog. We build their "personality" from that. Perhaps it's like that in cosmology. Whoever looks into the universe only sees a reflection of their own scientific beliefs? Ah! that's the answer! The Universe is a mirror
  19. 1 point
    I' d love the 12 inch at this price. Problem is still not quite sure about actual size and portability. As for the SW 10 ", I am saving it as a last resort. The reason I'd like a GSO is the dual focuser, better mount and probably the built in cooling fan. Having had a SW 200P for a while makes me suspicious about the reliability of the 10" Dob focuser...
  20. 1 point
    Hi I was using a 90mm Mak (Skywatcher Virtuoso) and i've not seen anything similar on other bright targets so I'm pretty sure the colours were due to atmospheric conditions... But whatever caused it, it looked very cool!! Saw it again last night - also saw Uranus, Neptune, Mars and Jupiter (5 planets all from my living room window!!)
  21. 1 point
    I was confused when I seen the temperature of 22 degrees untill I seen a glimse of your location Super sketch! Rob.
  22. 1 point
    Hi, A servo motor is usually a DC motor with some sort of feedback device (encoder) that feeds information on the motor position to the control system. I've used small DC motors with quadrature encoders to drive a micro robot. I was always amazed how slowly you could get the motor to turn and it would still move smoothly even with cheap'ish motors.. You also could achieve a very high wheel speed because the gearbox didn't need to be a high reduction ratio. This is exactly what telescope drive needs. Very slow controlled rpm for tracking at sidereal rate and a high top rpm for slewing. The overall effort and cost in the implementation of a DC servo drive is usually high, but you get the above benefits. You could use a RC model servo, but you'd need to make the output shaft be capable of continuous rotation. Also the high torque comes from the high reduction gearing in the RC servo so the maximum slew capability will be slow. I think the motor would be too small to provide sufficient torque once you'd removed some of the gearing to get a useable slew speed. Stepper motors are popular because the electronics are generally easier to set up and programming it relatively straight forward. However to achieve the tracking speed and useable high slewing, microstepping of the stepper motors is needed which complicates things again. Stepper motors have the unwanted characteristic of introducing harmonic vibrations at various rpms. You wanted quality before ease & cost so I'd go for a low or zero cogging DC motor and an encoder of say 500 pulses per rev which will give 4000 ticks per rev in quadrature. Program your Arduino to output a pwm signal to a full bridge motor driver to give you speed control. You'll probably need program a PID control algorithm in there too, to finely control the motor speed and to keep the mount in accurate position ! Your gearbox connected between the motor and worm shaft would be selected to give you your desired top slew speed and could be in the 50:1 range ?? depending on the size of your motor. The choice of which Arduino will come down to does it have sufficient processing speed to capture and process the pulse train coming from the encoders when the motor is running at full speed. Eg 5000 rpm motor * 4000 tick on the encoder per rev = 333kHz per axis ! You might need to move up to a more powerful processor ?? You could use a quadrature encoder ic which will do a lot of that works for you but again more complicated circuitry to design and interfacing to the micro. Good luck with this interesting project. Dave.
  23. 1 point
    Just a quick word of advice. It is often wrongly stated that you will want a lower power EP for DSO observing. A 30mm wide field will serve you well for some of the larger star clusters and nebulae, but wont be of much use on globular clusters, the majority of galaxies or planetary nebula. A nice range of EPs is needed for DSO work, from a nice wide angle EP (such as the one you state) right up to the higher powers. If I'm brutally honest, my 32mm rarely gets used apart from perhaps for 5 or 6 objects in the entire night sky. I only wish to state this to make sure you don't end up with an EP not fit for purpose; for the larger open clusters and certain large nebulae it's a good choice - but for galaxies, globulars, planetaries and other smaller nebulae it won't be of much use.
  24. 1 point
    I've seen the Horsehead with a 12" and UHC filter at a dark site but it was hard work. It's one of those "right of passage" objects whose fame far outstrips what you actually see. It was a lot bigger than I expected from all those descriptions that say "it's a lot smaller than you expect". What I saw was the surrounding nebulosity, which I could only see fleetingly in faint pieces, so I sketched those pieces, and I was left with a gap in the middle that was the Horsehead - looking more like a dog in my sketch. If it wasn't for the iconic photographs no visual observer would spend much time on this object.
  25. 1 point
    Let's hope that only occurs in the green TV-76'ers, Stu!! Haha
  26. 1 point
    That's very interesting - thank you Will see for myself soon
  27. 1 point
    Likewise, initially I was also rather overwhelmed by the apparent complexity of Maxim for capture/guiding etc and chose to use Atik's Artemis software instead. However, in recent months I've taken on board focus optimization with Focusmax, plate solving with PinPoint, and more automation with CCD Commander - all of these dovetail very nicely (and easily) into Maxim. After a few runs with the capture and guiding options in Maxim it's actually very easy to get to grips with and I have no issues at all with it now, and if anything I much prefer it to Artemis. It's like all new software, seems daunting at first then after a few runs you question what all the fuss was about. The CCD Commander automation package is fantastic and if you want "1-click" imaging, as long as you set up the action list and settings properly in advance, then CCD Commander really does offer this. It'll take in 1 click your parked mount accurately (via plate solving) to your target, will focus (via Focusmax), will set up automated guiding (via Maxim) and then takes/saves the subs you want all night long - in addition you can ask it to refocus as often as you want, either on the same imaging field as the subs or on an adjacent field that has a magnitude 4-5 star ideal for focusing with narrowband filters. Martin
  28. 1 point
    Awww that's so cute! I remember when I believed there was such a thing as "last thing to buy for awhile"... sigh... such simpler times. - Nate Birmingham, AL
  29. 1 point
    based on 4), 5) should be the Garnet star in Cephus. it's surprisingly red.
  30. 1 point
    Thanks for the comments guys with regard to the mounting of the scope Jake, I've drilled into the floor to fix the partition wall plates, the one hole I used a long bit to see how thick the concrete slab was it turned out to be around 8" thick, this being the case I intend to get hold of a fabricated pier and bolt it to the floor to start with. I don't think vibrational movement will be an issue as I'll be in the warm room sat down hopefully, if it does become an issue I have a son in law with a jack hammer . I will have to set the CG5GT tripod up once Ive got the roof opening sorted to work out the best height for the pier. the garage is actually aligned perfectly east west front to back so the lower walls (1.9 mtr) give me views to the north and south, the view west is partially blocked by trees in neighbour's gardens and the view east is out onto the front road with a dreaded lamppost outside in view, so the higher roof apex in that direction will mean imaging from 40 degrees above the horizon or there abouts I think, but at least the light from the lamppost will be obscured. Any way I'm on the paint brush for the rest of the week, well couple of hours after work each evening, I want to get 2 coats of under coat and a coat of gloss onto those frames ah the joy of it. Regards and thanks for looking all John
  31. 1 point
    Yes, there's a case for OSC, especially in frustrating on-off conditions. Capture is easier but while using both OSC and mono I didn't feel colour processing was easier. Its interesting that the advocacy of CCD has been consistent so far. Olly
  32. 1 point
    Forget this fear of CCD as some kind of 'deep end.' Ian King advised me to go straight into monochrome CCD and I've blessed him for this good advice ever since. It really isn't more difficult, this is just a perception. The cameras are doing what they were designed to do, not being cajoled and worked around to do what they were certainly not designed to do. If you do decide to go first to DSLR then keep to the cheap ones because then you get a big chip at a low price. Once you hit £2K you enter serious CCD territory and DSLRs can't compete. My thoughts, anyway. Olly Heh heh, crossed with Gina there!
  33. 1 point
    Summer weather in October, eh? That explains why it's bucketing down... James
  34. 1 point
    Very envious of those dimensions - whoever said size wasn't important? The warm room looks very tempting! Very nicely engineered and built thus far and making rapid progress. Assuming the garage is already built on a concrete slab how are you planning to mount the scope? I'm thinking you'll need to go quite high to get a good view with the height of the pitch.
  35. 1 point
    making good progress there, keep up the good work
  36. 1 point
    Hi welcome to SGL from Pete in Bedfordshire
  37. 1 point
    I agree with AG a very difficult object to image at that fl well done!
  38. 1 point
    My brother has a six inch mirror set and cardboard tube that he's been planning on turning into a dob for some time. I'm so tempted now to offer to do it for him and turn up one day to deliver a nicely-made dob with a full "hello kitty" pink paint job. James
  39. 1 point
    I could see Uranus with the Moon in the same FOV as in the sketch though it was a little better when I moved the Moon out of the FOV. I had a look again last night with the Moon a bit further away and again definitely thought it had a blue-green tinge to it. As you say, its a real thrill to actually see such a distant planet and with something so simple as a pair of binoculars too.
  40. 1 point
  41. 1 point
    I've removed some of the blue colour cast in the background, so I think I'm happier with this version. Comments and opinions welcome! E.
  42. 1 point
    Not being funny... But she looks terrified :-)
  43. 1 point
    Great question, Ben and thank you for raising it
  44. 1 point
    Worked from home today due to car trouble but at least I was home during one of the rare breaks in the cloud and as I had not stopped for lunch I grabbed the opportunity. Shot 132 x 1/1600 second, stacked just 35 after PIPP and followed by a little GIMP 20131016 by David_The_Bears_Fan, on Flickr
  45. 1 point
    I’m not sure if you’d say I got up early or only slept an hour to observe Jupiter in the early morning sky. Whatever the perspective the late night was clear and warm. Ursa Major was low to my right, above my head was Cassiopeia. In the south-easterly sky I could see the magnificent Betelgeuse and Sirius while Jupiter in Gemini gave the constellation a new outline. It was comforting to be back out again with these old and distant friends. Some nights I like to listen to mellow sounds of music, other nights to the songs of the city. Up here on the roof-top last night was no different. I could hear the sporadic sweeping swoosh of cars down below. There was a distant sound of voices settling into the warm late night air. My evening session was also accompanied by a little lizard who as far as I could tell spent most of the night hanging out on one of the walls. I like to think he is the same fellow I met last year, the same one who keeps the terrace and roof top free of grotesque creepy crawlies, disgusting dark spiders or locusts the size of the palm of your hand. I had already set up the Tal 100rs on an alt-az mount on the roof top and the 10” f/5 was down below on the balcony out cooling. I took a quick look at M42 with the 4” frac using a low power 24mm eyepiece. Even in the city at such a low declination I could see some of the nebulosity in the Orion Nebula. I split of few doubles around Gemini, had a peek at M 35 and NGC 2158 and then realising time was moving fast I climbed from the roof top and began observing Jupiter from the Moonshane. Although the weather folk had predicted terrible days of rain and clouds for Spain, this week in Aragón has been rather spectacular. The days have witnessed deep blue skies with temperatures rising into the 30ºC’s and the nights have been wam, extremely clear with good seeing. As such there was very little variation in the magnification used and depending on the moments, I was either viewing Jupiter at 250x, or to relax the eye a little dropping down to a more comfortable 210x. I spent the next 90 minutes observing Jupiter and his play of Moons, trying to tweak as much detail as possible. After 45 minuttes or so, I picked the blending stub, soft pencils and rag for blemishing and sketched what I thought I could see. After I finished observing Jupiter I noted that Mars was already climbing high over the city apartments whilst down below, caught between the horizon and ancient catherdral towers, was a delicate sliver of on orange moon greeting the coming of dawn. A fitting end to a perfect session.
  46. 1 point
    Here's some that may be of interest for plundering ideas: http://ghonis2.ho8.com/garysbinochair1.html http://www.waynesthisandthat.com/voyager.htm http://www.skyandtelescope.com/equipment/home/4584236.html http://www.homebuiltastronomy.com/binochair/BinocularChair.html I've also been toying with the idea of making a sort of angle-poise arrangement that fits to a reclining chair for my 15x70. As always, I come back to the portability-sacrifice issue. And, just in case you haven't already drooled over it, there's this non-DIY offering: http://www.starchair.com/index.html
  47. 1 point
    I was interviewed on last months S@N at the peak star party :-)
  48. 1 point
    Isn't it a bit like picking your favourite child? Just doesn't seem entirely right. Still, things I keep coming back to: Ring Nebula Swan (or Omega) nebula Double Cluster Cassiopeia open clusters - various, but M103 is a nice starting point. I can get it and 3 other OCs in the one field of view! Veil Nebula. First time I found it I had skies so dark a filter made no difference. Jupiter. I know it's only just coming around, but I also know I'm going to look at it a lot, again. The Moon. Yes, if it's up DSOs are hard, so roll with it. It changes out the time, so it's worth a good look.
  49. 1 point
    Yes, you are right! Although I suspect Luke has managed, in the past, to get the odd adapter past my radar. Wow, it's only taken eight years of marriage to reach that conclusion! ​And the counter argument about shoes, handbags, etc., doesn't apply to me. In fact Luke has more shoes than me! That's ruined Luke's birthday pressie then. ...On second thoughts, maybe he would prefer a handbag manbag for his birthday instead?
  50. 1 point
    Depends on how "creative" you are. :evil: No doubt many of the eyepieces came with the/a scope so cost was nothing, that takes care of the Celestron and Meade plossl eyepieces and the barlow . The TV plossl was undoubtly a surprise extra thrown in with the LX90 so cost nothing. Could you get away with the Mallincam stuff came as a packeage at the time of purchase ? And could you claim just under $500 ? The binoculars you have undoubtly had for ages and are just part of general household items so don't count. The Astronomic filters again claim a bargain buy for the lot, have a go at $300. Anything that looks like a run of the mill filter came as a set, so try $95 for the complete set. Not sure how to get round the Manfrotto bits. The lens pen and blower are just necessary items like tissues are for cleaning purposes, they don't count either, bit like cotton wool pads she will use for cleaning makeup off. See after all that I bet you haven't spent as much as you thought, and certainly less then she suspected/thought/believed.
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