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_ep24_banner.thumb.jpg.56e65b9c9549c15ed3f06e146fc5f5f1.jpg

Sign in to follow this  
Sam

Another go at NGC 6946

Recommended Posts

I added some data to NGC 6946 last night and managed to push the guiding out to 7 minutes - had to do some emergency soldering though :x . The emergency soldering meant I got started an hour later than intended which resulted in the bottom of the telescope hitting the tripod legs sooner than I anticipated - luckily though that was coinciding with the moon getting higher and illuminating some high cloud.

So here it is with last night's data and the data from last, I'm hoping to get about another hour (might even go to ten minute subs!!):

2 X 7mins

17 X 5mins

1hr 39mins total, canon 400D through an Orion XT8, autoguided by a SPC900NC(SC1 modded) on a ST80.

7879_normal.jpeg

(click to enlarge)

Sam

Share this post


Link to post
Share on other sites

Wow! It's really coming on Sam, that's great!

I notice you have those same drag marks though that I got recently, do you have any idea what causes them? It's SOMETHING in the stacking, but I'm not sure what, RGB Aligning maybe?????? Did you check the option to RGB align in final image in DSS?

Great pic anyway, really good.

TJ

Share this post


Link to post
Share on other sites

Thanks TJ, I don't know what is causing those but it took ages to try and get rid of them. I have only got them when I use offset frames - which I did for this one, so I must be taking the offsets wrong. Any ideas?

Share this post


Link to post
Share on other sites

It has definately benefited from the extra data, not an easy subject with the moon affecting any galaxy targets.

RB

Share this post


Link to post
Share on other sites

could it be fixed pattern noise from the sensor itself. I noticed FPN on my Canon 300D. It can be removed by subtraction (using dark frames, and bias frames). Did u add the frames or average them. A median combine may work better if your frames are slightly offset.

Best Wishes

Paul

Share this post


Link to post
Share on other sites

I've managed to narrow it down to two subs I took last week when the moon was out. For some reason they ended up with the diagonal pattern when DSS had to rotate them a little and this came out during processing. Paul, I don't think it's noise from the camera as all of the other frames were fine. :)

Sam

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.

×
×
  • Create New...

Important Information

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