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

Sign in to follow this  
MarcusAntonio

Meade LX90 Reflection

Recommended Posts

Hi All...

I am wondering if anyone can help me?

Just starting out imaging with a Meade LX90ACF 8". Whilst I am not new to this, I've changed my game from CCD to DSLR and am on the learning curve again! I am getting a strange reflection when I image anything bright, ie a star. Please can you have a look at the image and see if you have any tips to not get this crazy blue swirl... whilst it is pretty, it is clearly not anything in the sky and will always be on the image somewhere.

Lunar or planetary.. not a problem... just the bright stuff (whether a short or long exposure). I've tried a canon 350d and 1300d.. both the same! I am still playing with my alt/dec % so am still getting a little star trail on this 3 min exposure, not worried about that!

star.jpg

Share this post


Link to post
Share on other sites

Probably an internal reflection caused by the bright star bottom right corner. If the artifact wasn't present with the ccd then something else in the imaging path might be reflecting onto the DSLRs sensor.

Share this post


Link to post
Share on other sites

Is the reflection always blue?

Reducer?

Different nosepiece to the ccd one?

Michael 

Share this post


Link to post
Share on other sites

I was watching a documentary this morning that had a shot of the arc from a welder.

There was a large blue ring around the arc,  just like your blue ring.

 I see dslrs in shot being used for HD video, so maybe these are reflections forwards from the bayer mask?

Michael 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
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 fourth image.
      With my "lucky week" of imaging, along with M33, I managed to finish also this project. This is my longest integration to date.
      These are IC 405 and IC 410, also known as the Flaming Star Nebula and the Tadpole Nebula, respectively, taken over 7 nights, under my Bortle 5/6 home sky.
      Total integration time: 18h 29m 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
      2020/11/18: Number of subs/Exposure time: 41@240s + 1@300s. Notes: L-Pro filter, no Moon
      2020/11/21: Number of subs/Exposure time: 48@300s. Notes: L-Pro filter, Moon 46% illuminated
      2020/11/24: Number of subs/Exposure time: 48@300s. Notes: L-Pro filter, Moon 75% illuminated
      2020/12/07: Number of subs/Exposure time: 15@300s. Notes: L-Pro filter, no Moon
      2020/12/13: Number of subs/Exposure time: 22@300s. Notes: L-Pro filter, no Moon
      2021/01/10: Number of subs/Exposure time: 37@300s. Notes: L-Pro filter, no Moon
      2021/01/11: Number of subs/Exposure time: 18@300s. Notes: L-Pro filter, no Moon
      Total exposure time: 66540s = 18h 29m 00s.
      Pre and post-processing: PixInsight 1.8.8-7.

      This image was particularly hard to process, since there are many bright stars and stretching the nebulosity while taming the stars was quite difficult. I am sure I didn't manage it as well as I would have liked.
      Here's a link to the full resolution image: Flaming Star Nebula (IC 405) and Tadpole Nebula (IC 410)
      Thanks for looking!
      C&C welcome!
    • 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 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 hooloovoo
      Hi, I'm just getting started with astrophotography and have been gathering the equipment. I've purchased the Star Watcher Evostar 72 APO Refractor Telescope and I've been researching all over the place for what flattener I should purchase. I'm wondering if there's a rule on how to pick one, does it have to be a certain size, brand, type, etc? Or does just any typical flattener work?... I see a wide range of prices and Its a little unclear to me what exactly I'm looking for since some flatteners look different than others. Im planning to connect this to a Nikon D7500 and I already have the M48 T mount but I don't know if thats relevant or only for certain flatteners as well. Basically any advice on how an amateur should set up and what all I need to get going. Thanks in advance for any help and recommendations. 
    • By stevebb
      Comet Neowise above Filey Country park
×
×
  • Create New...

Important Information

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