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larsmn

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About larsmn

  • Rank
    Nebula

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  • Location
    Sweden, southern Baltic coast
  1. Problem resolved, checked with MXToolbox.com and there is several faults in the DNS record definitions for the sky-map.org. That's why it is flaky.
  2. Hi, am using Swedish national registrar, IIS.se, DNS. Same guys that is operating one of the 12 root server sites for ICANN, so that's not my problem. And Sky-map is the only regular site with this behavior.
  3. Now it is 20:36 CET / 18:36 GMT and both is again without DNS entries again. Anyone knows how to contact these guys, for the contact info at the sites is not working. Cheers
  4. :-( Not here, gets that the DNS entry do not exist. But now wikysky works. However, that to is mostly gone after 18:00 GMT. Is like the system do not run 24/7 but US night (04:00 GMT-)
  5. Hi, just wondering if any here has runned the Celestron Nexstar Evolution mount in EQ mode with/w-out guiding and how long successful exposures you could do with either. If guided, what guidecam used/recommended and software to use. Cheers/Lars
  6. Well, not local software, but still web-based software; I have since 2011 up until last autumn been using sky-map.org as my session planner. Much better than Google Sky (can't get it to work), Stellarium (cumbersome and lacking close-up pictures) and others to identify the nights objects and peculiarities. with close-ups to check size etc. And with their Beta version, it was a very good support to navigate. But something has happened, started last winter, the site being unstable and now more or less down. Tried to write them, but no reply. Anyone knowing whats going on, if they closed shop or so? Cheers/Lars
  7. Thanks for all answers. To answer some of the questions: - No, I haven't tested the collimation, but my club mate says it's ok. - The attachment fixture takes 2" attachments, like the reducer and backfocus extension, therefore I guessed it was made to work with 2". My mistake. - We have both used the exact same backfocus between the reducer and the sensor, the 105 mm recommended by the shop for this tube. 110 mm is a new value for me, first they said 97 mm, then 105. The shop is my country's biggest and regarded as a knowledgeable astro shop. My conclusion is the tube is for less than APS-C sensors and the reducer I received is not the correct one. Have to live with that I got incorrect information about the tube visa-vi camera options, but also have to try to get the reducer changed.
  8. Thanks, however, the key issue at hand is that most modern tubes today do work with at least APS-C sensors and 2" openings, ED or not ED, refractor or reflector. But apparently not this one, though the ocular fitting is 2". If I understood my club chairman right, this one is limited to max threefour sensors. That is what I meant with an old construction, while the 8" and 9.25" is adapted, this is not. It did work with his 1997 reducer, not with the one Celestron delivers today. So there is some mismatch visa-vi the larger tubes. Is it only the sized that makes it or is there some design differences causing this. I had expected that if only having one reducer model, well, it to be working on all tubes it's intended for. The Cel's 8" and 9.25" SCT:s both are Fastar or EDGE SCTs tubes, which apperently can use this 2" reducer and give at least a APS-C sensor coverage. So is it only the smaller size that causing these issues. Also, due to mobility, an 8" or larger was not an option, the 6" Evo is the maximum my balcony observation solution can handle.
  9. Past summer I bought a Nexstar Evolution 6" to be able to use a bit bigger tubes than possible with my old SkyWatcher AltAz Goto. Have done a lot of astro-photo with the SkyW and a SkyW Evostar 80ED with a lot of good result, the Evolution to improve that (has a wedge planned for EQ operations). Due to getting back claims from a previous bankrupted employer, I got enough for the combo + reducer and a Sony A7R. When looking for a suitable solution, I told the shop that I was to use the combo with a full sensor camera, my old Sony Nex-5R having past 50.000 pictures, showing a lot of wear. The tube also did have a 2" attachment at the back. But my first tries have been a sordid disappointment. An extreme amount of coma triangular stars (pointing to the center) from 1/3 out of the center, degrading outwards. With the reducer is should be a f-6.5 tube, but my experience is that it is worse than my Evostar without it's reducer, f-8. My astro club chairman tested the tube with his 1990 Cel SCT 0.65x reducer and his verdict was that the tube I have is an old construction, same as his 1990:es SCT. With his reducer and his ST-8300 camera, he gets good circular stars over 60% from center, but he says the tube is a dud for APC-S or above. You knowing anything about, is it correct that Celestron ships an older 6" tube with Evolution, compared to the 8" and 9.25" tubes, not allowing APS-C or above in sensors or do I simply have got a the wrong tube? The shop is trying to get out of this unfortunately. If I am stuck with this, is there any other reasonably priced reducer/flattener suitable to correct some of this, so I haven't thrown all of my compensation down the drain?
  10. :-) Thanks both, thought of a DC converter, since I have a couple lying around, but for simplicity, battery is the solution. It's a pitty it is 9V, for I have several 7.4 and 11.1 V lithium polymer (LiPo) batteries.
  11. Hi, Have an old Lidl/Bresser NG mount, I got several years ago. When having had it for a year, I added a small alu arm to the mount base, allowing me to mount a EQ1 motor to it. Why? The NG mount, though its quality limitations, is the smartest and design wise best mount I ever encountered. If the quality of the tripod and the mount was in the same range as most EQ2/EQ3 manual mounts, it had been the best beginner mount ever. Anyway, I did some modifications to counteract it's limitation, making it a workable mount/tripod. To go over to a SkyWatcher AltAz goto, since the stability of the EQ1 drive was failing and load was limited to Bressers cheaper small refractors. Then, to the Swedish yearly national Astronomy Night and Day event in Oct, I got a SkyWatcher Heritage-76 for a local exhibition. After the exhibition I started to play with doing a very lightweight Heritage/NG combo. Last week I did and I have now a 1-2 kg stable 300/76 EQ Dobson, that can be taken out if one wakes 3-4 in the night and the sky is perfect, as it can be on the island I live on. A perfect Quick&Dirty telescope (QDT), with acceptable optics and that with a Barlow can take a DSLR (prime focus is inside the focuser). However, the EQ1 drive plays up. It do not keep a stable rate and when the battery goes below 9V it starts to slow considerably. A couple of times I have succeeded to adjust it to take 15-20 20 sec exposures with the 900/70 mm f-12.9 refractor it came with and have 3 or 4 1 min exposures of M42, so it can do astro photo. But after those 15-20 shots, it needs speed re-adjustment, which isn't exact. I am not interested in pushing a load of money on this one, but I do like to get the drive more stable, keeping the object relatively fixed in the ocular for an hour or so or finding another low-tech EQ1 drive solution that can, maybe an Arduino or Raspi solution. The EQ1 gearing works, while a EQ2 drive I have do not.
  12. Nebula, Didn't find a "prevent sleep" in my Android tablet, but have downloaded an app for it. However, after 35-50 min (not the same each time) the connection goes down. Cheers
  13. PS. The picture says M42 is reduced, that is a typo, it's not DS.
  14. Hi, have an Skywatcher AltAz goto with an Evostar 80ED I used for the last couple of years. The first shots was taken without a reducer, but since I had coma etc, I got SkyW 0.8x one. And after that I not been fully satisfied with details, though I uses a Batinov mask to focus. Then on a sale I got me a William Optics P-Flat 4 with variable back focus (66-88 mm). Which does not focus at all. When turning the 80ED focuser to it's inner-most position, I still hasn't any focus in the the camera, though having a +66 mm distance to the sensor (Sony Nex-5R). Like if prime focus with the WO P-Flat is inside the 80ED. Which got me wondering if I can have some problem also affecting the SkyW reducer, though having the recommended 56 mm distance, back reducer to the sensor. Am adding a M42 without reducer below and an M17 taken with the reducer (sorry about the extra text, but they are to an astro "picturebook"). Both are 30 sec exposures, approx. 100 subs each and using the same dark, flats and bias. As seen the M42 has far more detail. Anyone with any idea whats my problem, not getting focus ?
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