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.

stargazine_ep34_banner.thumb.jpg.28dd32d9305c7de9b6591e6bf6600b27.jpg

Recommended Posts

Hi guys,

I have few unfinished books but still want a new one ("Making every photon count"). I was wondering if someone has it in good condition and is selling it at a good price :)

AJ

Share this post


Link to post
Share on other sites
On 03/01/2017 at 06:51, allcart said:

PM sent

Received the post today and looking forward to read it over next couple of days. Thanks you Allan!

Share this post


Link to post
Share on other sites
Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By endless-sky
      I would like to share my third image.
      I finally had a "lucky week", since my last session, December 18th. I managed 5 clear nights out of the past 6 (has to be a record, at least for me and my area) and I was able to finish a couple of projects I had started long ago and start a few new ones.
      This is M33, also known as the Triangulum Galaxy, taken over 10 nights, under my Bortle 5/6 home sky.
      Total integration time: 10h 14m 00s.
      Here are the acquisition details:
      Mount: Sky-Watcher NEQ6 Pro
      Telescope: Tecnosky 80/480 APO FPL53 Triplet OWL Series
      Camera: D5300 astromodified
      Reducer/flattener: Tecnosky 4 elements, 0.8x
      Guide-scope: Artesky UltraGuide 60mm f/4
      Guide-camera: ZWO ASI 224MC
      2020/11/08: Number of subs/Exposure time: 11@240s. Notes: L-Pro filter, no Moon
      2020/11/09: Number of subs/Exposure time: 10@240s. Notes: L-Pro filter, no Moon
      2020/11/20: Number of subs/Exposure time: 15@240s + 4@300s. Notes: L-Pro filter, Moon 30% illuminated
      2020/11/21: Number of subs/Exposure time: 22@300s. Notes: L-Pro filter, Moon 45% illuminated
      2020/11/24: Number of subs/Exposure time: 20@300s. Notes: L-Pro filter, Moon 75% illuminated
      2020/12/13: Number of subs/Exposure time: 12@300s. Notes: L-Pro filter, no Moon
      2020/12/14: Number of subs/Exposure time: 8@300s. Notes: L-Pro filter, no Moon
      2020/12/18: Number of subs/Exposure time: 6@300s. Notes: L-Pro filter, Moon 20% illuminated
      2021/01/10: Number of subs/Exposure time: 9@300s. Notes: L-Pro filter, no Moon
      2021/01/11: Number of subs/Exposure time: 15@300s. Notes: L-Pro filter, no Moon
      Total exposure time: 36840s = 10h 14m 00s.
      Pre and post-processing: PixInsight 1.8.8-7.

      Image was Drizzle Integrated and then cropped to original sensor size (6016x4016), without resampling. So, it appears as if taken ad double the focal length (768mm instead of 384mm). Image scale 1.04 arc-sec/pixel.
      Here's a link to the full resolution image: Triangulum Galaxy (M33)
      Thanks for looking!
      C&C welcome!
    • By AJ-DE
      Hi All, I have a Star Adventurer but have had problems getting consistent results even when setup was as near to perfect as I can do, (this was focussed on due to this issue).
       
      It took me a while to find out that when the eyepiece is is extended for focus it is very loose, so loose the graticule moves indipendantly of Polaris / background.
       
      I have asked the supplier, "Astroshop.eu", to highlight the problem and ask for their feedback.
       
      Question to Astroshop.eu:
      I have had a constant issue with Polar Alignment. As I cannot use it so often, (visibility), it has taken me a while to identify the problem. When I adjust the polar scope focus the eyepiece is so loose that the graticule moves a lot laterally in all directions in the view. I can send a video but I think you can  understand what I am saying.
      Basically I must be getting something very wrong or there is an issue with the product. The thread is so loose it is entirely unstable.
      Please advise what we can do about this.
       
      Answer from Astroshop.eu:
      1. "I'am sorry to say, but this is very normal and does not affect the function of the star adventurer".
      2. "My collegue confirmed that this will not be a issue".
       
      I have subsequently asked the guy to ask his colleague again, but some time has gone past and I have no further reply.
       
      I think it is clear enough from the text and would really appreciate some experienced answer, any comments very welcome.
      Additionally here are the videos I have sent to show them, (hand holding the phone so a bit shaky but issue can be seen. I'd really appreciate some help before I spend too much time again tring to get it to work, for reference the eyepiece wobble is around 3.5 graticule intervals, so not small. As it's full of grease it took me a long time to see how poor quality the Polarscope build quality is.
       
      https://drive.google.com/file/d/1VC1p30t8n45oS6fkdxjkztrnoR1r7c6x/view?usp=sharing
      https://drive.google.com/file/d/1mjBaecqTmIhXgJUC-dERRYBb-LaryLMN/view?usp=sharing
       
      Thank you all, Andy
    • By deanchapman2705
      Hi guys, hoping you can help with the tracking problems I'm coming across with my astrophotography setup. I've been using it since August 2020 and have kind of put up with the problem until last night where I think it's getting worse...
      Specs below (let me know if you need anything else):
      William Optics Zenithstar 61 II (360mm F6.1) - Zenithstar 61Adjustable Field Flattener iOptron SkyGuider Pro Camera Mount Full Package K&F Concept Aluminium Tripod with 2kg weight Canon EOS 250d (cropped sensor 1.6x) The problem:
      I take roughly 40 pics with each being 1 minute long at 1600 ISO and stack them on DeepSkyStacker. From a few people I know on the internet, it seems as though, with a very similar setup and same focal length, they can get around 3 mins of exposure with no problem. And that's without a guide camera.
      With my 1 minute exposure, roughly 10 of 40 images are reasonable but the rest have star trailing or double stars (see attached downscaled, unedited pics of Orion nebula)
      What I think it could be:
      My first idea was the tripod, it's not the best but it's not cheap plastic, and it should be fine for a 1 min exposure. Then I thought it could be the iOptron tracker that could be faulty?
      Every screw has been tightened, there's no play in any of the adapters/mounts.
       
      I thought I'd post this here to see if anyone else has the same problem or has more experience/knowledge that could help. Also to see if there's an obvious problem before I spend hundreds on a new tripod or send the tracker back for a replacement.
      Any help would be much appreciated!
      Thanks,
      Dean
       









    • By SpaceDave
      I'm new to the astrophotography hobby. I have experience with astronomy. I am struggling to make decent deep sky images (other than M42). The images don't seem to have much definition or brightness despite a decent overall exposure time. See the below images. I have seen on this forum that people are able to take awesome images of the below objects with my same setup. Is anyone able to tell me if I am missing something, please? Do I need even more exposure time?
      I use a Celestron 6SE with unmodified Canon 600D. It has a goto alt az, no EQ. I use a bahtinov mask to focus. Both images were taken with the native focal length of 1500mm, no filters or eyepieces.
      The image of the Triangulum Galaxy is 180 x 15sec ISO800 images. The Crab Neb is 250 x 15sec ISO800 images. Both images had their appropriate flats, darks and biases (30 of each). I use SIRIL to stack the images, which I have had good success with M42 before (see below).
      Any advice would be appreciated!



×
×
  • Create New...

Important Information

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