Jump to content

stargazine_ep34_banner.thumb.jpg.28dd32d9305c7de9b6591e6bf6600b27.jpg

Recommended Posts

Hi can anybody tell what has caused these lines and what I can do to get rid of them? Also there seems to be dark edges around the smaller stars. I have never noticed these effects before so any advice would be great. The image is a stack of 22x30sec subs at ISO 400 and 16x30sec ISO 400 darks and stacked using deepskystacker

Thanks Dean

jpg.gif

post-14596-133877405722_thumb.jpg

Link to post
Share on other sites

hmmmm....

do you apply flats?

flats should remove FPN if done right.

take about 30 flats, add these to the mix.

the darks havent helped the lines so arent the source of the problem.

are you using bias frames.

flats would be my first point of call

Link to post
Share on other sites

It has been a while since I used my 350D. At a setting of iso400, 30 secs wont give you too much in the way of fainter stuff, but I see you have tried to make the most of what you have. I'd say you have just gone a little too far with it.

Of course, you can stretch it to destruction to bring out the nebulosity, but you will also highlight all the fixed noise elements that wouldnt normally be seen with standard stretching.

To get good detail that is really very faint, longer exposures are necessary. You may get a smoother result with 100 x 30 secs, but if possible try for 25 x 60 secs, and use iso800. Any increase in noise from using iso800 will be swept away with stacking when you have 25+ subs to use.

Hope that helps a little.

TJ

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
  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.