Go Back   IceInSpace > Equipment > Equipment Discussions

Reply
 
Thread Tools Rate Thread
  #1  
Old 22-08-2019, 09:26 PM
skymuster (Mike)
Registered User

skymuster is offline
 
Join Date: Apr 2018
Location: Altona, VIC
Posts: 7
My own Hubble repair mission (no spacewalks involved)

I had my own NASA moment this week. After purchasing my new dedicated mono astrophotography camera (ASI1600MM) I endured the obligatory cloudy nights for the next 3 weeks solid! I used this time to give my scope a spring clean, including the primary mirror. When the clouds finally broke I was excited to finally experience "first light" with my new camera. The results were, however, underwhelming. I just couldn't seem to achieve sharp focus and my guider was showing every star as a double star! I had the same feeling as the NASA scientists when the first blurry images from Hubble came back.

Here is the original image:

Click image for larger version

Name:	NGC6188_Ha_BAD_s.jpg
Views:	59
Size:	181.3 KB
ID:	248313
[single 300s exposure, unity gain, Ha filter]

After much head scratching, and a bit of buyer's regret about this expensive camera I'd just bought that didn't seem to work, I found a couple of posts online indicating it could be due to "pinched optics" when I reinstalled the primary mirror. This resonated with me (I recalled tightening the mirror clips) so I set about performing my own "Hubble repair mission". An evening of removing the primary mirror again, lossening off the retaining clips, reinstalling and recollimating and I was ready to attempt "second light". No spacewalks were involved.

When the clouds finally cleared again I was able to take a single test image. I really wasn't expecting much difference but as soon as the exposure was done and the image materialised in front of my eyes, I almost fell off my chair. The grin on my face was almost comical!

Here is the new image:

Click image for larger version

Name:	NGC6188_Ha_GOOD_s.jpg
Views:	62
Size:	210.8 KB
ID:	248314
[single 300s exposure, unity gain, Ha filter]

Like the intrepid NASA astronauts many years ago, my own Hubble repair mission was a resounding success. I had corrected the dodgy optics and now had a sharp image. This hobby definitely has its ups and downs but I am pleased to say this is definitely one of the highs!

I now can't wait to put this camera through its paces and put together my very first narrowband image. Lots of fun times ahead!
Reply With Quote
  #2  
Old 23-08-2019, 05:19 AM
jwoody's Avatar
jwoody (Jeremy)
Registered User

jwoody is offline
 
Join Date: Aug 2011
Location: Ormeau Hills, Australia
Posts: 327
Excellent, good result result Mike.
I find it very satisfying when you fix problems like these.
Cheers
Jeremy
Reply With Quote
Reply

Bookmarks

Tags
mirror pinch, optics

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 10:35 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
Limpet Controller
Advertisement
Testar
Advertisement
NexDome Observatories
Advertisement
Astronomy and Electronics Centre
Advertisement