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    SGL 2017 SP


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About rotatux

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    Star Forming

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  1. Wide Field M35

    Nice capture. FWIW from looking at Stellarium, a bit of Monkey Head would rather be bottom half-right, and far right half height would be NGC2175... EDIT: sorry, indeed I meant Jellyfish rather than Monkey head, as pointed by Cozzy, and it's fainter than the other nebula as I only see a red patch.
  2. Imaging with the 130pds

    You don't tell about capture conditions, so as I wild guess, your star elongation looks approx. perpendicular to the direction of image center. To me this looks more like field rotation, maybe mixed with a bit of coma in angles. About tilt checking during the day with the cam train on, just a rough idea: maybe focus on a the vertical face of a far building, and check focus along a vertical line on live view ?
  3. Linux and Stacking

    Hello, I'm on Linux only so I will advise what I use often. For deep sky stacking you can try Regim (requires Java 6/8 depending on version). For video stacking (moon, planets) you can try cvastroalign, but you will have to guess how to use it -- though simple, it has no manual nor help. You will also need a at-least-16-bit-depth image processing software (such as Gimp 2.9+ or Fotoxx).
  4. The "No EQ" DSO Challenge!

    Don't be discouraged, I too face a mount that doesn't want to be stable enough more then 20-30s (more often 20). My keep rates vary from 22 to 80%, so you're pretty up the score I think if you would read back this thread it would be somewhat the same for others. You're on your way. Nice image, you caught much nebula. However I find it's strangely too noisy given the high number of frames you stacked. Maybe you had to stretch very aggressively ? What ISO were your subs ? Did you shoot low on horizon ?
  5. Imaging with the 130pds

    Here's a last-half moon from last month (this one fullsize, contrary to my gallery). First try at video-like stacking with a proper burst shots sequence. Auto white balance then added some contrast and color saturation. To my surprise some color differenciation appeared, so quite happy with it This was without Barlow, now I'm just wondering for next try whether I should do 130PDS+barlow or 127MAK ? Optically I prefer the MAK, but the focuser and camera coupling is much better on the 130...
  6. The "No EQ" DSO Challenge!

    Here's some planetary for a change: 2 sample shots of Saturn taken on 2017-06-11. Details: ~120s FullHD @ 30p movie crop mode, Olympus E-PL6 with Celestron 127MAK/1500mm and x3/x2 APO Barlows on NexStar SLT, processed with cvastroalign. (indulgence requested, I'm still learning how to process planetary footage and use cvastroalign) Edit much later: realized this is not in the thread's subject (not DSO), I should not have posted here. Oops :-/
  7. This was taken on 2017-06-09, sky was cloudy for weeks so that's all I could try my new OM-Zuiko 135mm/3.5 on. I have plenty of them so I made a short selection, which I find most 'artistic'. Clouds take nice colors which are almost natural, just amplified by the cam (cloudy white balance).
  8. Help needed

    Another trick: first aim at a bright star, focus, lock it, then move to M31. Use your finder each time to check the target position in the finder w.r.t. position on the image.
  9. Linux for a Dummy

    Actually it's not "many different Linuxes" but many different distributions, Linux being only the kernel. Distributions are assemblies of software where most software is the same everywhere, and some choices are different. The main differences are in package management, desktop user interface, and initial desktop setup. A desktop is an assembly of file manager, background, window manager (= decorations and associated behaviour), and some other elements depending on the chosen desktop. You don't know those concepts because they don't exist in Windows where everything is uniform and imposed by MS. IMO the strong point resulting from this is choice of ergonomics, and that's why so many distributions (5+ pkg managers x 10+ desktops x 10^N possible setups x 10^P general or specific usage targets). As a newcomer you should try a few of several desktops (KDE Gnome XFCE LXDE LXQT...) to get a feel of which ergonomics is best for you, and keep an eye on ease of package management. Most distros will allow you to install additional desktops to try after initial setup. As said previously, KDE (though it's not my own choice) is usually considered closest to Windows habits, and is the desktop of choice if willing to use KStars / Indi.
  10. Linux for a Dummy

    Then you must add as a requirement to not touch your boot device / sector, or it will make your BIOS-MBR-system unbootable when you remove the USB disk. Or with a recent EFI-based system, it might be simpler and work directly (can't tell, I don't own those beasts). Most probably, yes (USB3 sure 99%, thunderbolt unsure) If it's a NV124/GM204 (NV110 family), the nouveau open-source driver seems to be lagging with no 2D support: see https://nouveau.freedesktop.org/wiki/FeatureMatrix/ If you select a distribution which ships proprietary nvidia drivers, the answer will probably be 'yes' but it's not pure linux any more. I doubt you have a soundblaster since that's from very old times... most PC nowadays are based on Intel' AC97 and perfectly supported. I don't know what those FX themes are. Though it has happened by the past for a few poorly-engineered CD/DVD drives, you can safely presume 'no'. It can break your windows install in the same machine though if you don't take care. You should backup it. It will be a new world with it's own designations for your hardware, you could get confused and overwrite your windows and realize too late, so if you can, remove the windows drive to avoid accidents. Edit: about Wine... never had luck with this one, YMMV. But it may be a good idea to switch to Linux-ecosystem applications if you can. Good luck and keep the force.
  11. imaging with alt/az mount

    LOL... that's times for a tripod ! Meaning you have no tracking... You probably didn't follow the alignment procedure for your mount (prefer the 3-star align, but many have success with 2-star). BTW: you don't tell... are you using a remote trigger for your cam, or some kind of intervalometer (wifi control) ? it's mandatory.
  12. imaging with alt/az mount

    You can probably do planetary and short exposure imaging. Short meaning something between 15s and 60s, depending on your cropping and mount williness. Your Sony cams will allow you high ISO imaging (dont' go in the "extension" zone), which helps a lot with short exposures. You will need to stack many short exposures (try 20 first, then 50, then 100 once you are comfortable), so you have to learn something like DSS (if Windows) and some image post-processing tool. Browse the "No EQ DSO challenge" thread for what is possible with that kind of setup. (and don't forget your traditional lenses)
  13. The EQ3 DSO Challenge

    I rather suspect our browsers to be the culprit... Some of them try to be smart and alter color profiles (for the sake of cohesion I presume). To check, you could try to open your local image in a browser tab, rather than going through SGL submission, and compare with external viewer of even PS. BTW nice image, I like star colors too (a bit too cyan?). Interestingly the version I prefer is your last one without darks (less contrasty mottles), but it's maybe just a matter of black point.
  14. Quite unique... at first I thought it was out of focus, but zooming it's clearly not. How did you manage a wide+panel with a single camera, weren't the clouds moving ?