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.

sgl_imaging_challenge_banner_through_the-_eyepiece_winners.thumb.jpg.236833c5815bb321211a43f4d5214ba8.jpg

Petergoodhew

M31 - my first attempt

Recommended Posts

Captured on my remote TS Star71 in Spain.

5h50m total integration (41x300s L, 10x300s R, G and B).

M31 jpg.jpg

  • Like 15

Share this post


Link to post
Share on other sites

I'm no authority on AP but i would say that's a great first attempt for sure!

Share this post


Link to post
Share on other sites

If my first attempt is even remotely this good I’ll be delighted. Great job :)  what camera did you use?

Share this post


Link to post
Share on other sites
Just now, dannybgoode said:

what camera did you use

It was a Teleskop Service Star71 (effectively a clone of a William Optics Star71). F4.9

Share this post


Link to post
Share on other sites

Oh yes, That is a superb Image, brilliant..

Share this post


Link to post
Share on other sites
42 minutes ago, Petergoodhew said:

It was a Teleskop Service Star71 (effectively a clone of a William Optics Star71). F4.9

Thanks -very nice. Which CCD or CMOS did you use?

Share this post


Link to post
Share on other sites

Hope you don't mind me being maybe a bit harsh with this comment, but something is odd with the image - it feels softer than it should be.

I took a closer look and indeed, there are some artifacts, can't really say if its due to focus issues or processing, but here it is:

image.png.d80cb941538129be10ac1beb0adb6f5a.png

 

Share this post


Link to post
Share on other sites
2 minutes ago, dannybgoode said:

Which CCD or CMOS did you use?

QSI683 CCD camera

Share this post


Link to post
Share on other sites
48 minutes ago, vlaiv said:

Hope you don't mind me being maybe a bit harsh with this comment, but something is odd with the image - it feels softer than it should be.

I took a closer look and indeed, there are some artifacts, can't really say if its due to focus issues or processing, but here it is:

image.png.d80cb941538129be10ac1beb0adb6f5a.png

 

Thanks VLAV.  Well spotted!  I check it out.  Peter

Share this post


Link to post
Share on other sites

Yes, I'm not convinced by the focus either but here in SE France we have recently had seeing so bad that I have scarcely been able to believe it. Also the small aperture will tend to throw up larger stars. (The Tak was giving an FWHM of 2.3 when it often comes down to 0.88.)

Jetstreams in the wrong place, I guess.

Olly

Edited by ollypenrice
Typo. I said the Yak was giving an FWHM of 2.3!!!

Share this post


Link to post
Share on other sites
2 minutes ago, ollypenrice said:

Edited just now by ollypenrice

I was just looking for one of those Yak scopes :D

Dave

  • Haha 1

Share this post


Link to post
Share on other sites
On 20/01/2019 at 17:21, ollypenrice said:

Yes, I'm not convinced by the focus either but here in SE France we have recently had seeing so bad that I have scarcely been able to believe it. Also the small aperture will tend to throw up larger stars. (The Tak was giving an FWHM of 2.3 when it often comes down to 0.88.)

Jetstreams in the wrong place, I guess.

Olly

You were right not to be convinced Olly. I was also getting FWHM of 2.3 on the Star71 - but that doesn't explain the softness, nor does poor focus. Careless clumsy processing is the explanation!  Have reprocessed the luminance from scratch. I think this is an improvement.

 

M31 jpg V3.jpg

Edited by Petergoodhew
  • Like 2

Share this post


Link to post
Share on other sites

Yes, this is better.

Dust lanes definition improvement is noticeable. Still quite a lot softness, but as Olly pointed out - is probably due to seeing (and having tough time trying to focus in poor seeing), and not much can be done about that.

Share this post


Link to post
Share on other sites

Indeed better. Shoot some fresh lum when the seeing's settled, maybe. It won't much matter for the colour.

Olly

Share this post


Link to post
Share on other sites

A bit of judicious deconvolution might help make it 'crisper'.

You may also want to play with gamma a bit, perhaps dropping it to 0.95 or 0.9

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

  • Recently Browsing   0 members

    No registered users viewing this page.

×

Important Information

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