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Astrophotography...
http://forum.celestialmatters.org/viewtopic.php?f=9&t=927
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Author:  t00fri [ Tue, 31-07-18, 18:30 GMT ]
Post subject:  Re: Astrophotography...

Very nice, Stephen! I was curious to see how things will look with your scope and technique. My family and I were far less successful in Munich. There was plenty of dust etc. at the low altitude where most of the action took place. Also there were plenty of obstacles ...

Cheers,
Fridger

Author:  schreiberste [ Fri, 14-09-18, 8:54 GMT ]
Post subject:  Re: Astrophotography...

Finally I've got a better mount (a second-hand NEQ6), so now I'm able to expose much longer with much less wasted time!
This is my first result: the Iris Nebula, stacked from 277 images of 100 seconds each. More than 7.5 hours of usable exposure time in just 2 nights - what a difference!

Steffen

Attachments:
File comment: Iris-Nebula, 277 x 100s Iso400
Iris-Nebula_(277x100s_no_flat_driz).jpg
Iris-Nebula_(277x100s_no_flat_driz).jpg [ 1.48 MiB | Viewed 833 times ]

Author:  t00fri [ Fri, 14-09-18, 10:32 GMT ]
Post subject:  Re: Astrophotography...

Wow, what a huge progress!

I found an interesting site, with a photo of NGC 7023 , C9.25 telescope, SBIG STF-8300C camera and Astro-Physics 1600GTO mount. It is interesting to compare.

https://www.astrobin.com/47776/

What is a bit striking is the substantial difference in (blue) color.

Cheers,
Fridger

Author:  schreiberste [ Fri, 14-09-18, 12:27 GMT ]
Post subject:  Re: Astrophotography...

Sure, if you do a quick google image search for Iris Nebula, you'll see a wide range of different shades of blue. This nebula was even featured several times in "Astronomy Picture of the Day", so you could also limit the search by adding "apod" to the search key words. Even then you will find very different "interpretations" of the same object.
Anyway, while I try to not introduce false color information, I don't do any scientific color calibration, but just eyeball my processing so that the background is neutral and the main object looks "good" to me. :DD

Author:  t00fri [ Fri, 14-09-18, 17:42 GMT ]
Post subject:  Re: Astrophotography...

Here is another challenge for a better mount: The Draco Triplet

This is how celestia.Sci renders the Triplet:
North is up (following the displayed vertical grid lines).

[click on image and then hit F11 (firefox) for a big image]
Attachment:
Screenshot_20180914_193402.png
Screenshot_20180914_193402.png [ 317.94 KiB | Viewed 818 times ]


Cheers,
Fridger

Author:  fenerit [ Sat, 15-09-18, 9:25 GMT ]
Post subject:  Re: Astrophotography...

Well done! Beautiful image of the Iris nebula. The new mount seem to meet your expectations. Where do you have found its strong points?

Author:  schreiberste [ Sun, 16-09-18, 14:19 GMT ]
Post subject:  Re: Astrophotography...

fenerit wrote:
Well done! Beautiful image of the Iris nebula.

Thanks!
fenerit wrote:
The new mount seem to meet your expectations. Where do you have found its strong points?

It's a nice upgrade compared to my old mount, for sure. Being able to do 100 second exposures while keeping 95% of the images is a real time saver! And this is all still without auto guiding. I still have to check, how far I can go without guiding, but I think with good alignment 200-300 seconds should be possible.
Go-To is also very nice to have, sparing another 0.5 hour of finding the object I'm going to photograph.

Author:  schreiberste [ Fri, 21-09-18, 12:30 GMT ]
Post subject:  Re: Astrophotography...

Just for a quick test of what the new mount could do, I had a short 3 hour photo session with M31 again. I think, compared to my last attempt this is quite an improvement in resolution. I'm quite happy about the much more favorable ratio of effort vs. result quality :D

Steffen

Attachments:
M31-Andromeda_2018-09_(106x100s-ISO400)_dt.jpg
M31-Andromeda_2018-09_(106x100s-ISO400)_dt.jpg [ 1.9 MiB | Viewed 737 times ]

Author:  t00fri [ Fri, 21-09-18, 21:49 GMT ]
Post subject:  Re: Astrophotography...

This is gorgeous! ...and I have seen many amateur type shots of M31.

Cheers,
Fridger

Author:  schreiberste [ Sat, 22-09-18, 9:08 GMT ]
Post subject:  Re: Astrophotography...

Dankeschön :D

Author:  Guckytos [ Mon, 24-09-18, 16:40 GMT ]
Post subject:  Re: Astrophotography...

Very nice pictures.

Ah, would like to such things too, but in the big city ...

Anyways in about 2 months time I will be able to enjoy the southern sky (albeit only with small binoculars) :mrgreen:

New Zealand be prepared for me. :DD :DD

Regards,
Guckytos

Author:  schreiberste [ Sun, 14-10-18, 19:21 GMT ]
Post subject:  Re: Astrophotography...

Time for something more difficult: NGC 7331 group and Stephan's Quintet.
This very nice field is really at the absolute limit of what can be captured with my small 6", but I had to try it and see, how it works out with my new mount. I was still using 100 second exposures, as I don't have any auto-guiding setup yet. For these faint and distant galaxies, one would ideally go for much longer exposures.
But with 240 usable exposures - 6:40 hours of integrated light - I think the result is still remarkable. Lots of galaxies to see in the final image!

Fridger, could you show us the Celestia rendering of that area?

Steffen

Attachments:
File comment: NGC 7331 group and Stephan's Quintet
NGC7331-Gruppe_2018-10_(240x100s_driz_bgx_cc_autostretch)_2.jpg
NGC7331-Gruppe_2018-10_(240x100s_driz_bgx_cc_autostretch)_2.jpg [ 1.24 MiB | Viewed 540 times ]

Author:  t00fri [ Mon, 15-10-18, 18:51 GMT ]
Post subject:  Re: Astrophotography...

Prima!

F.

Author:  t00fri [ Fri, 19-10-18, 18:09 GMT ]
Post subject:  Re: Astrophotography...

Steffen,

Quote:
Fridger, could you show us the Celestia rendering of that area?

Please find the celestia.Sci rendering of the NGC 7331 group below:


  • a) your nice photo:

    Attachment:
    ngc7331_group_phot.jpg
    ngc7331_group_phot.jpg [ 55.87 KiB | Viewed 449 times ]

  • b) celestia.Sci rendering:

    [for a bigger size, click on image and then hit F11 (= FF fullscreen)]
    Attachment:
    n7331.jpg
    n7331.jpg [ 71.59 KiB | Viewed 449 times ]
After zooming in you will be able to read the NGC designations of the dimmer group members.
Further up, I have displayed already the celestia.Sci rendering of Stephan's Quintet.

Cheers,
Fridger

Author:  schreiberste [ Sat, 20-10-18, 14:42 GMT ]
Post subject:  Re: Astrophotography...

These renderings are truly amazing!

By the way - I hope that I can try imaging the Draco Triplet you mentioned earlier, but it will have to wait for next year, maybe around April. Before that, our house is in the way - no unobstructed view in northern direction.

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