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.

  • Announcements



Advanced Members
  • Content count

  • Joined

  • Last visited

Community Reputation

419 Excellent

About bobro

  • Rank
    Star Forming

Profile Information

  • Location
    Isle of Wight
  1. 1st test mono stack of Bodes galaxy

    Pretty good M82 with only 5 subs @ 30 secs. Can only get better with more!
  2. 1st test mono stack of Bodes galaxy

    Thanks for posting your findings. I've been imaging M81 recently and wondered how an ASI174 would compare to my DSLR. Apart from the amp glow (which seems to be a feature of the ASI174) noise in your image is certainly less than with my DSLR. That's to be expected of course and overall imaging time needs to be considered for an RGB result. Hopefully you will be imaging M81 in RGB - I look forward to another report!
  3. Cacoon

    That's a really thought provoking image - previously I had considered darkness surrounding the Cocoon, but your image makes for the realisation that dust is the answer with stars showing through from behind the dust. Lovely!
  4. M81/82

    Great detail and lovely image. Looks to be towards the blue end of the spectrum - depends on conditions and equipment I suppose.
  5. Tadpoles in IC410

    Super clear tadpoles - hope you can catch them turning into frogs!
  6. Sort of First proper DSO images

    Good start to DSO imaging. Starting out with a mono camera and filters isn't easy. Perhaps you could concentrate on taking mono (luminance) images to start with, reducing complexity before adding colour? Dithering is a great way to improve images by reducing noise.
  7. ZWO ASI183MC

    It would be interesting to hear other experiences with this camera, especially as it is marketed as an 'alternative to a DSLR'. It has relatively small pixels at 2.4um, which makes for good planetary imaging. Yet high Mpixels aren't needed for planetary as objects are small. If, for example, DSO imaging is required with a 200mm aperture 1000mm fl scope, the resulting imaging would be at 0.5 arcsec per pixel, which may be a bit too precise for some setups. Larger pixels could make more sense for DSO imaging. It is a colour camera - not so good if shorter exposure or narrowband work is the aim. No cooling either, so no benefit of low temp noise reduction. My interest is DSO and an ASI174 cooled mono camera seems to me to be better for DSO imaging, though filters would be required for colour. So is the ASI183MC just a jack of all trades or is there a sweet spot for it?
  8. Hi Phil, Greetings from just across the water! Lovely images and nice scopes to image with! Good advice from Art above. I thought to add a bit more about colour, but realised your CCD may be mono.... Bob
  9. m81 + m82

    Impressive detail, especially for just 1 hour of data. I think your scope is f#4.8. Recently I imaged M81 with my 150PL - a bit slower at f#8. You can see my effort (much longer imaging time) here for comparison : https://stargazerslounge.com/topic/309605-dso-imaging-with-150pl-m81/ Perhaps the skies are a bit clearer in Alicante?
  10. Stepping it up a gear

    Hi Art! Yes a while - I've been busy with my CG5 trying to get it to guide well (especially reducing backlash) to support a 150PL acquired some months back. After trying SkyWatcher geared stepper motors and 2 types of belt driven stepper motors with AstroEQ I have it working well enough, although clouds and the Moon haven't helped with testing. I allow about 40 seconds for dithering to operate and settle - not always enough so APT detects this, stops the exposure and tries again (DEC is always the problem). Your HEQ5 Pro should be better, though I'm only guessing. Here's a link to one of the few images I've managed so far with the 150PL : https://stargazerslounge.com/topic/309605-dso-imaging-with-150pl-m81/?tab=comments#comment-3387234 Looking forward to seeing more images with your setup! Bob
  11. Stepping it up a gear

    Yes - you are well on the way to super images with the new setup! Don't forget dithering as it can make a big difference to noise and can save time with calibration frames.
  12. Quick Horsy Horse in Ha

    Amazing amount of nebulosity!
  13. The jpegs all look very similar with no issue I could see, so I tried to stack them with DSS. Similar to your findings the number of stars jumped from 0 to over 900 as the star detection threshold was reduced to 48. Even with this setting I couldn't get the images to stack, so I enabled noise reduction in the star detection threshold window. This allowed #detected stars to smoothly increase as the detection threshold was lowered. Stacking then worked ok and the resulting image didn't show the curious corner. Perhaps you could try the same with the noise reduction?
  14. Interesting ..... the first and last subs align perfectly and also align with the strange corner at the brightest points. To my knowledge DSS doesn't do any scale changes though does handle rotation. Examining more subs could help by finding out if there is any difference in subs. I'm happy to do this if you are ok to post them. Stacking with a different program could also be an idea if this is possible.
  15. Could you post the entire first and last subs (rather than just crops) so that any change can be looked for? Thanks.