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 Post subject: Re: Astrophotography...
PostPosted: Tue, 31-07-18, 18:30 GMT 
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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 ...

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Fridger

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 Post subject: Re: Astrophotography...
PostPosted: Fri, 14-09-18, 8:54 GMT 
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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


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Iris-Nebula_(277x100s_no_flat_driz).jpg
Iris-Nebula_(277x100s_no_flat_driz).jpg [ 1.48 MiB | Viewed 83 times ]
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 Post subject: Re: Astrophotography...
PostPosted: Fri, 14-09-18, 10:32 GMT 
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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.

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Fridger

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 Post subject: Re: Astrophotography...
PostPosted: Fri, 14-09-18, 12:27 GMT 
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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


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 Post subject: Re: Astrophotography...
PostPosted: Fri, 14-09-18, 17:42 GMT 
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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]
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Screenshot_20180914_193402.png
Screenshot_20180914_193402.png [ 317.94 KiB | Viewed 68 times ]


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Fridger

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 Post subject: Re: Astrophotography...
PostPosted: Sat, 15-09-18, 9:25 GMT 
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Location: Tuscany, Tyrrhenian Sea
Well done! Beautiful image of the Iris nebula. The new mount seem to meet your expectations. Where do you have found its strong points?

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 Post subject: Re: Astrophotography...
PostPosted: Sun, 16-09-18, 14:19 GMT 
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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.


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