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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial
Thread started 27 Oct 2010 (Wednesday) 15:45
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You don't need a telescope

 
TCampbell
Senior Member
Joined Apr 2012
Mar 02, 2016 15:35 |  #1876

okieplainsdrifter wrote in post #17920502 (external link)
The Rosette was my first try with masked stretching using Pixinsight. My use of starmask is pretty limited and it shows! I am working now to try to get rid of the halo's. It was also my first attempt to shrink the stars using PI. Still learning but I'll get there. Here is another one I am working on.
thumbnailHosted photo: posted by okieplainsdrifter in
./showthread.php?p=179​20502&i=i176950088
forum: Astronomy & Celestial

That looks fantastic! Those stars look great.

Here's what I do to shrink the stars in PI:

1) Use the "star mask" to generate the mask and then apply it to my image.

2) Then use "MorphologicalTransfor​mation" -- In the MorphologicalTransform​ation window set the size to "5 (25 elements)" and it should show you a 5x5 grid to the left. There are some icons just below the "Size" and "Way" pull-downs and you wan to find the icon that looks like a circle (2nd from left in the 2nd row of icons.)

3) Then go to the top section of that same window and reduce the "Amount" slider (it's set to 1.0 by default which means 100% and that's too much... back it off to about half (.50) and try it by applying it to the image (you might end up un-doing it and trying a little more or a little less). It does a nice job of shrinking the stars.

When you're shrinking stars then you're already at the point in your workflow which is more art than science... so the "right amount" is whatever you think looks good... :-)

All the other defaults tend to be fine.




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okieplainsdrifter
Member
59 posts
Joined Oct 2008
Mar 02, 2016 19:21 as a reply to TCampbell's post |  #1877

Thanks T! I did not reduce the Amount slider was my first problem. Pixinsight was well worth the money!




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sunnysu
Hatchling
3 posts
Joined Mar 2016
Post has been edited over 1 year ago by sunnysu.
Mar 03, 2016 09:20 as a reply to post 17916047 |  #1878

beautiful shot!




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sunnysu
Hatchling
3 posts
Joined Mar 2016
Mar 03, 2016 09:52 as a reply to post 17835336 |  #1879

billions of stars! nice capture




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swltr
Senior Member
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Joined Nov 2013
Germany
Mar 06, 2016 11:36 |  #1880

Aurora Australis and Milky Way

IMAGE: https://farm8.staticflickr.com/7798/18209667108_0929965bc2_b.jpg
[IMAGE'S LINK: https://flic.kr/p/tK8i​BJ] (external link)Aurora Australis & Milky Way (external link) by Steffen Walther (external link), auf Flickr

http://www.steffenwalt​her-photographics.de (external link)
500px (external link)
flickr (external link)

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swltr
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Joined Nov 2013
Germany
Mar 06, 2016 11:36 |  #1881

Dolomites night

IMAGE: https://farm2.staticflickr.com/1456/25261517410_a6dcda324d_b.jpg
[IMAGE'S LINK: https://flic.kr/p/EugT​2C] (external link)Dolomites night (external link) by Steffen Walther (external link), auf Flickr

http://www.steffenwalt​her-photographics.de (external link)
500px (external link)
flickr (external link)

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swltr
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Joined Nov 2013
Germany
Mar 06, 2016 11:37 |  #1882

IMAGE: https://farm2.staticflickr.com/1537/24022541004_2fe1547c48_b.jpg
[IMAGE'S LINK: https://flic.kr/p/CAMN​vs] (external link)Alpine night sky (external link) by Steffen Walther (external link), auf Flickr

http://www.steffenwalt​her-photographics.de (external link)
500px (external link)
flickr (external link)

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Celestron
Cream of the Crop
8,403 posts
Gallery: 1 photo
Joined Jun 2007
Texas USA
Mar 06, 2016 13:27 as a reply to swltr's post |  #1883

Is that the actual color you saw in the Aurora ?




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Celestron
Cream of the Crop
8,403 posts
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Joined Jun 2007
Texas USA
Mar 06, 2016 13:29 |  #1884

Your last two shots look bright as day . what lens and f/stop did you use ?




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Davenn
Senior Member
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Joined Jun 2013
Sydney, Australia
Post has been last edited over 1 year ago by Davenn. 2 edits done in total.
Mar 06, 2016 19:41 |  #1885

Celestron wrote in post #17925713 (external link)
Your last two shots look bright as day . what lens and f/stop did you use ?


one would have to assume there was a moon in the sky lighting up the landscape

edit....
did a search on moon phases and as assumed ... full moon was 3 days earlier than the photo
That's for the second shot ... the snow covered mountains

FM 23 Jan, image 26 Jan 2016


Dave


A picture is worth 1000 words ;)
Canon 5D3, 6D, 700D, a bunch of lenses and other bits, ohhh and some Pentax stuff ;)

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buggz
Senior Member
780 posts
Joined Dec 2007
Mar 19, 2016 21:33 |  #1886

Okay, I tried again on another clear night.
MUCH better focus this time, as I took my time.
Took MANY burst shots, and several video clips.
Unfortunately, I could not get the Registax, nor AutoStakkert apps to work stacking photos, nor video.
I used DeepSkyStacker for the following stack, which seems to work pretty good I think.
Especially, for not knowing what I'm doing!

Panasonic GH4, Canon 100-400L @ 400, Metabones T Speedbooster 0.64XL

IMAGE: http://www.cornbread.com/~buggz/OrionNebula-resized.jpg

5DMkII, 40D w/ grip, lenses, flashes, more stuff.

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Pagman
I just hold the thing :-)
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Joined Dec 2011
Mar 19, 2016 22:05 |  #1887

buggz wrote in post #17941269 (external link)
Okay, I tried again on another clear night.
MUCH better focus this time, as I took my time.
Took MANY burst shots, and several video clips.
Unfortunately, I could not get the Registax, nor AutoStakkert apps to work stacking photos, nor video.
I used DeepSkyStacker for the following stack, which seems to work pretty good I think.
Especially, for not knowing what I'm doing!

Panasonic GH4, Canon 100-400L @ 400, Metabones T Speedbooster 0.64XL

QUOTED IMAGE


Very nice image our Panasonics sure create decent pictures with a little bit of our intervention;-)a:-)

P.


Nikon D7100, Nikkor 300 f4 IF ED :-)

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TCampbell
Senior Member
Joined Apr 2012
Mar 20, 2016 00:22 |  #1888

buggz wrote in post #17941269 (external link)
Okay, I tried again on another clear night.
MUCH better focus this time, as I took my time.
Took MANY burst shots, and several video clips.
Unfortunately, I could not get the Registax, nor AutoStakkert apps to work stacking photos, nor video.
I used DeepSkyStacker for the following stack, which seems to work pretty good I think.
Especially, for not knowing what I'm doing!

Panasonic GH4, Canon 100-400L @ 400, Metabones T Speedbooster 0.64XL

QUOTED IMAGE

Very nice image!

BTW, with regard to Registax, AutoStakkert, and Deep-Sky Stacker...

Deep-Sky Stacker (and other programs that are used to stack deep-sky images) use the positions of stars identified in the frame to align (register the positions) of the frames to a master frame so that they will all stack correctly.

Planetary images (including the moon) the images are very short -- so short that normally stars won't show up in the image (unless the planet happens to be near a particularly bright stars). That means reliance of stars to register the frames won't work... so those programs rely on the "disk" of the planet shape to register the alignment.

This is why Deep-Sky Stacker worked for this image (you have stars it can use to register the alignment of each frame), but Registax and AutoStakkert did not work (they're looking for the round "disk" shape of a planet or moon to align the frames and you don't have one of those in this image.)




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buggz
Senior Member
780 posts
Joined Dec 2007
Mar 20, 2016 09:48 |  #1889

Thanks for this explaination.
I wasted a LOT of time trying to get those programs to work, I really wanted them to work!
*8^)
Now I know, thanks again!

TCampbell wrote in post #17941376 (external link)
Very nice image!

BTW, with regard to Registax, AutoStakkert, and Deep-Sky Stacker...

Deep-Sky Stacker (and other programs that are used to stack deep-sky images) use the positions of stars identified in the frame to align (register the positions) of the frames to a master frame so that they will all stack correctly.

Planetary images (including the moon) the images are very short -- so short that normally stars won't show up in the image (unless the planet happens to be near a particularly bright stars). That means reliance of stars to register the frames won't work... so those programs rely on the "disk" of the planet shape to register the alignment.

This is why Deep-Sky Stacker worked for this image (you have stars it can use to register the alignment of each frame), but Registax and AutoStakkert did not work (they're looking for the round "disk" shape of a planet or moon to align the frames and you don't have one of those in this image.)


5DMkII, 40D w/ grip, lenses, flashes, more stuff.

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buggz
Senior Member
780 posts
Joined Dec 2007
Mar 20, 2016 10:08 |  #1890

I also find that I have 3 nice frames of "a shooting star" along with the nebula.
I am wondering how to process for a simple .GIF animated sequence.
This would be cool, my niece and nephew liked those frame sequences.


5DMkII, 40D w/ grip, lenses, flashes, more stuff.

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