Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_solar_25.thumb.jpg.f1d5d01d306644f613efd90ef96b314c.jpg

All Activity

This stream auto-updates     

  1. Past hour
  2. If this is Hi Tech Astro what's low tech?
  3. I am using an Orion Space Probe 130 short tube. I like the scope and recently upgraded the mount from eq2 to skywatcher eq5 pro goto, what a difference, the old saying “ no mount, no scope” couldn’t be more true. My question is this..... do I buy an SW 150 pds to get into planetary/ lunar imaging, (max size for my mount) as the focuser on my Orion is a serious handicap. I have been following a huge thread from the SW 130 pds owners who are getting amazing results from the same aperture as mine, but that scope has the two inch dual speed focuser. Does anyone know if there is a focuser available for my Orion that will in effect make it a 130 pds? I don’t want to buy a slightly larger scope to get a dual speed focus, camera friendly focuser if I can add one to what I already have. Thanks in advance. Marv
  4. Hi, An bit of a side note on this topic, browsing through YouGov the other day I saw that a poll on this topic had resulted in 70% disapproval. Another 10-15% didn't know and only a very small percentage liked it. The lunar advertising campaign reminds me of the Chinese proposal to build an artificial moon to light cities at night. Such stupidity and imaginative ability are unrivaled even by Hollywood. John
  5. That's a shame, if what has been said is true with regards to insurance. They don't miss a trick, do they?! I've always found it very helpful, when people are describing observation sessions to see what they have used. Also when people suggest pieces of kit, to be able to see that it works well in a set up similar to yours is very useful. People don't always include that info and I imagine that, even if they did, it would then still count as "advertising". If it is true, it would make a great deal of what goes on here completely and utterly pointless! "I've just bought this super bit of kit, but I can't tell you what it is. Also, I can't tell you what 'scope I used it in, but that's jolly good too. Please don't tell me what 'scope you have and whether I could recommend my super bit of kit for use with that! However, the Horse Head Nebula was totally spiffing!" I don't see how we could continue the review section. I suppose we could redact all sensitive information.
  6. Hi all, I have one and am just getting to grips with it. In doing so - and it's probably quite obvious anyway - that the supplied 'polarscope' tube is not great. However, by carefully unhinging the tension spring it is possible to sandwich a thin metal plate around the locking nut in such a way as to mount a proper polarscope. You just need a plastic spacer ring to lock the plate in place around the driveshaft. This looks a bit like the polarscope mounting of another type of tracking mount [you know the one!] - actually I got the idea from that other mount - but if you can get hold of some 1/16" gauge - or similar - steel sheet and some 3mm thick PTFE or polyeythylene sheet [I used a food cutting board] - that is stiff enough to hold the polarscope, this mod or upgrade is a doddle to do. I am surprised Omegon never thought of it in the first place.
  7. Solar white light granulation imaged on the 21st April. Some great seeing early that morning so I was able to use the 2.5x barlow with the Evostar 120 and ASI178MM. Original frame is 2500x2048 but the frame was sharp enough for me to be able to crop and scale it up 125%. This one was taken with the Lacerta wedge and Baader continuum and UV/IR cut filters.
  8. Sounds fabulous Piero. Having you in charge of a lovely big dob under some dark skies should give us some exciting observing reports to look forward to!
  9. Hi, it's a nice image. However when zooming in on it or showing the image at native resolution it shows some very heavy posterization artifacts. is it possible that it was compressed a bit too much to post on this forum? I'm quite positive the original will not have these artifacts. or at least it shouldn't. Nonetheless a very fine image with obviously a very good colour balance and plenty of detail. Wouter.
  10. I think pretty much anything you buy is going to be more than capable of handling the load so there just aren't any worries in that respect. However, larger wheels are supposed to be easier to start turning, aren't they? If you have more than one section of track per side then I think the larger wheels might well roll over the joins more easily too. I went for 80mm wheels (though mine are for V shaped track rather than round): https://www.fhbrundle.co.uk/products/0586604000__80mm_Dia_V_Groove_Wheel_One_Ball_Bearing_Internal_Support Four are quite enough to carry my roof (probably about 150kg) and roll sufficiently easily that my fourteen year old daughter can open and close it without struggling. In fact once it's moving it requires very little effort at all. Definitely worth getting input from someone who has round track though, as I assume the round groove wheels will contact more of the track than the V groove ones (which only have a very small area of contact) and may need a bit more effort to turn as a result? James
  11. I had a quick chat with Dave today. He will kindly install a cooling fan behind the primary mirror, aside from the usual two or three holes allowing air circulation in the mirror box. It might not be necessary for this 1.45" thick primary mirror, but it is certainly easier to add one now than later. The mirror was ordered too. John said that it might be delivered to Dave in 8 weeks. Very happy about how this project is taking shape!
  12. I'm not an expert in correctors but the big 3" Wynne works excellently as far as I can tell but I don't have a full-frame camera. Personally I'm not a perfectionist and don't lose sleep over marginally un-round stars right in the corners but mine covers the field virtually perfectly (always a dangerous word) Having said that I 've had equally good results in 2" format with a skywatcher aplanatic coma corrector, and the ES 4-element jobbie on an APSC sensor. Both admittedly in a slightly slower f/4.5 Newtonian. A lot of issues with these scopes arise either from miscollimation or not having the camera square-on to the optical axis. F/4 is very unforgiving in more ways than one..the depth of the focal plane is tiny. I've been lucky in not needing a tilt adjuster (or maybe I'm just not critical enough?) One other thing; I was told an EQ6 would be ok for an AG12.....NO WAY! It might just about cope with the naked OTA but add in the rings, Wynne, Atlas focuser, filter wheel camera, finder and I was up to nearly 30kg. You are talking about only a 10" but I suspect an EQ8 may be on the cards if you go the full nine yards in 3" format. My EQ6 is just fine with my 8" f/4.5 and 2" kit....
  13. Hi. Having a clear out and have various items for sale. Celestron NexGuide autoguider. Power cable has been altered to run off a 12v battery but can still be spliced back to battery pack if wanted. £75. Pair of guidescope rings for up to 100mm scope approx. £20 SW 10 x 50 finderscope, some black paint has burnished off, see pic for details. £20 Heavy duty anti vibration pads. £12 Opticstar AR90S scope. Nice scope for travel viewing or a cheap intro into imaging. SW tube rings included. The dual speed knob has had the fine control removed as it isn't very effective. Is still included though. No 2" to 1.25" adaptor included either. £90 Opticstar AR80S scope. Great little scope to use as a guidescope with the above. Worked well for me. Couple of scuffs on the body. £85 Postage extra on all items. Any questions just ask. Cheers. Jas
  14. Thanks for the feedback. The problem with the Polarie is the need for batteries and x2 ball heads - one off the tripod and another off the Vixen Polarie, which gets a bit cumbersome to erect and not quite as portable as I'd hoped. Notwithstanding, it is a good piece of equipment that once set up works well and I'm likely to heed your advice on changing. Graham
  15. Taken around the end of March. L = 18 x 600 sec, R = 13 x 600 sec, G = 13 x 600 sec and B = 15 x 600 sec. 9hr 50min in total. All binned 1 x 1. Capture SGP and PHD2, processing with DSS and Photoshop. I've fiddled a lot with this image and found it dificult to know when to stop. Focus could be improved but I'm waiting for the new Celestron motor focuser. The trouble is they keep delaying the release in the UK, AND putting the price up!
  16. Andy, you can PM your mobile number to the seller, we just recommend that that you don't post it on the public forum.
  17. Interesting report with a lot of good information Dave, many thanks.
  18. sloz1664

    Hello

    Hi and a very warm welcome to the Lounge Steve
  19. This was single shot taken with a Samsung S8 (Android) on my father in law's rooftop in Vacoas, Mauritius on April 18th. I was facing East/North East and was mesmerized by seeing Orion "on its side" for a Northern Hemisphere dweller such as my myself. No processing, just straight from the phone. The mountain is Corp de Gardes and was 3 miles away. Also visible are Castor and Pollux and I think also Alhena. I was imaging the Carina nebula when taking this...thanks!
  20. Not quite sure with your replies who you are responding to - but I would like to buy it as I said in my previous post. Not sure what next step is as Stargazers Lounge wont allow me to send you my mobile number? Andy
  21. Thanx RL. It was my feeling too. I think it depends on your camera. I have a full frame Canon, but I plan to shoot in narrow band and CMOS/CCD camera. If I go for the Newtonian, then I'll choose the Feather touch focuser. Are you pleased with the Wynne corrector (I guess is the one buit in from OO)? TS are advocating that there my be less lighting with the Wynne system.
  22. Thanks, yes it was really nice to do EAA on the southern sky and enjoy the country side during the day. I already miss that. @RobertI yes all of the images are at the native focal length. I had with me a cheap 0.5X reducer but after experimenting a bit I didn't like much the final image (still a bit of distortions at the edge of the frame). Since I was not really struggling with time in getting images I decided to stick to the long focal length. True my histograms were very much on the left side on sharpcap but just within the "green" area...I didn't want to push my luck with long expositions on the basic tripod. One thing that really surprised me and I don't yet fully understand is how fast it was to get to a final image compared to my observations from London. I have never done EAA on a real dark site so I can't compare but I think the dark sky + the UV-IR filter (needed to remove some red halos around some stars) helped to keep a real black background...and maybe without any background to fight everything shows up faster, is that right? E.g. The Eta carina nebula really shocked me. Essentially, it was already there in the live preview as soon as I slewed to it. Ahh, now I want a dark sky again!! Just realised I didn't mention my software setup. Here it is Synscan App Pro for WIN10 SharpCap pro 3.1 . (Live stacking, Plate solving and to refine GoTo) Cartes du Ciel to pilot the mount. Everything is running on a win10 laptop and it seems fairly stable... Flavio
  23. Today
  24. Now testing with the new cooler replacing the waterblock in the ASC. The camera temperature is slowly coming down. The fan is pretty noisy run from the full 12v. I could do with rigging up some digital thermometer chips for reading temperatures with this sort of testing. With the aluminium adapter ring for the lens and no warm air blowing over the lens it has steamed up. Camera image sensor has not yet got down to freezing - still a degree or so above.
  25. By the way I'm helping my friend turn his 3.2m dish into a radio telescope. Feed -> LNA -> 3m + 1m usb extension (or 5m with no USB extension?) -> SDR. We set it up to point to zenith, but after a lot of tries, we didn't manage to get a signal from the Milky Way (when it was in the beam of course). This is the LNA he's got: https://www.ebay.com/itm/0-1-2000MH-z-RF-Wideband-Amplifier-30dB-low-noise-LNA-Broadband-Module-Receiver/311841967599?hash=item489b3acdef%3Ag%3AFRsAAOSw7R9b~RqO&fbclid=IwAR0I3gdSEr8Iq1Rmx6c_Ik5UFQ7dAeO88tQFFO979QmrLgr0LrrkIOmI-mI We've tried with both GNU Radio (with the averaging option) and GQRX, but no apparent signal, only a tall peak to the right of 1420 MHz (after some investigation we concluded that it is coming from the internal oscillators(?) in the SDR, but it shouldn't affect the detection much). Where do you think is the problem? At 1420 MHz, the LNA has a gain of around 28 dB and a noise figure of around 2.8. Could the LNA be generating too much noise or too little gain for the signal to get through a 3 or 5m RF cable?
  26. There a couple of clones on Amazon nowadays for about £50
  27. Hi everyone! I was lucky enough to spend Easter in Mauritius and managed to get a night of imaging in despite the tropical night time clouds! As someone who lives in the Northern hemisphere, the Carina nebula has always been a target I've coveted, but during my holiday, I also loved Crux as prominent constellation in the Southern sky. So when I ran into polar alignment issues with my Skyguider Pro, I decided to play it safe and go for a wider field, capturing both those targets rather than focusing purely on Carina as was my original goal. This was shot from my father in law's rooftop in Bonne Terre, Vacoas, Mauritius and my basic polar alignment meant significant field rotation, but I still got some usable data. Cropped, processed and finally upsampled. Data was shot at f/2.8 with a 50mm lens, unguided on an unmodified Sony a6500. 174 lights at 30 secs each = 1.4 hours of integration. Bortle 5. From the colours it looks like these objects sit right on the disc of the Milky Way and I know there is more in the picture I haven't mentioned! Thanks for looking!
  1. Load more activity
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.