blazer_workz
Senior Member
wow..cool!:thumbsup: Thank you for answering for thread starter..
chrisyo said:Hi everyone,
Sorry that I have no time to craft a more detailed explanation, but for the time being, I'm sure these websites will be very informative:
Virtual Equatorial Imaging:
http://astrosurf.com/vdesnoux/virtualeq/virtualeq.htm
Dan Heller's Tutorial Series:
[SIZE=+3]Photographing Star Trails[/SIZE]
http://www.danheller.com/star-trails.html
Thanks Weixing for helping answer some questions. Will try to share more tonight.
Cheers,
Chris
We confirm are inside the Milky Way, but we still can shoot the (bigger part) of milky way "in front" of our view, the "smaller part" is at our back is not so obvious and we seldom notice.Qazwer said:Just few questions ... Isn't our Solar System part of the Milky Way?
If yes, we have to come out of the Milky Way to view it so that we can get the entire (full) view of it. There is not way of viewing it from the Earth, right ... Unless Earth is at the edge of Milky Way. Who justify that? :think:
If no, which galaxy are we in? So, is Milky Way just beside our galaxy? :dunno:
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Yes. Our solar system is located in the outer edge (in the Orion Arm) of the our galaxy... which is called Milky Way Galaxy.Just few questions ... Isn't our Solar System part of the Milky Way?
That's right... we can't see our galaxy face on. We always see the cross section view of the Milky Way. By some deductive exercise and by measuring the stars and nebula in our galaxy and compare with other galaxy that we can see.If yes, we have to come out of the Milky Way to view it so that we can get the entire (full) view of it. There is not way of viewing it from the Earth, right ... Unless Earth is at the edge of Milky Way. Who justify that?
Hi,Qazwer said:Thanks zcf & weixing for explaining.
But how do you know that we are facing the correct side of MW when Earth is obiting around the Sun. Since we are at the edge of MW, there are possibilty that we would face the other side of MW eventhough when it's night. :think:
Excuse me for my ignorance. :sweatsm:
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chrisyo said:I borrowed a friend's 350D to take this image using an 18mm lens and a tripod. You'll need the dark skies of Malaysia for this. 4x 30sec shots were taken and then stacked and processed.
Astrophotography with a tripod is actually really easy but involves some software processing. Our bright skies is another limiting factor too. I'll share some photos taken in Singapore if anyone is interested.
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www.singastro.org
I think the most importance "secret" is a place far from light pollution on a clear moonless night...AReality said:Can share the secret settings?
ISO, aperture, shutter, etc...
.
Hosea said:Hi Chrisyo, would you hv 3x more than the amount of stars trail (30sec lenght) you actually see on site when u stack 4 exp to create one pix?
Would your software take care of the fg & bg of the photo. Your case is a galaxy pix without fg & bg.
I am curious![]()
Yes. If you can see star trail in a single 30s exposure on your image, you'll get 4x more star trail if you stack 4 different image of 30s exposure. This is a digital star trail method that can be use to "beat" the light pollution and reduce noise.would you hv 3x more than the amount of stars trail (30sec lenght) you actually see on site when u stack 4 exp to create one pix?
Hmm... :think: I never try this on the software before, so not sure how the software will react. But since star is in different position in each image, but the foreground object remain at the same position in each image... So if your wide field (non star trail) image contain non-stellar object, such as tree, the non-stellar object will be blur after the software align the star (if the software able to perform with the alignment) and stack. Unless you used a very wide angle lens and the time different that you took the first image and last image is short enough, so that the star didn't drift much, then you may still be able to get a image with nice foreground object.Would your software take care of the fg & bg of the photo. Your case is a galaxy pix without fg & bg.
Hi Weixing, appreciate your reply to my question.. it helps to clear some of my doubts.weixing said:Hi,
Yes. If you can see star trail in a single 30s exposure on your image, you'll get 4x more star trail if you stack 4 different image of 30s exposure. This is a digital star trail method that can be use to "beat" the light pollution and reduce noise.
Hmm... :think: I never try this on the software before, so not sure how the software will react. But since star is in different position in each image, but the foreground object remain at the same position in each image... So if your wide field (non star trail) image contain non-stellar object, such as tree, the non-stellar object will be blur after the software align the star (if the software able to perform with the alignment) and stack. Unless you used a very wide angle lens and the time different that you took the first image and last image is short enough, so that the star didn't drift much, then you may still be able to get a image with nice foreground object.
You won't have this problem if you are taking a star trail image, since no alignment on star is done.
Have a nice day.
You are welcome...Hosea said:Hi Weixing, appreciate your reply to my question.. it helps to clear some of my doubts.
As for the fg & bg question. I asked coz IIRC, there was mentioning that the stacking come
with rotation of pix.. this meant if I hv a fg or bg objects.. i would surely hv problem.
Thanks!!
redstone said:SOrry, what settings did you use for that picture?
Any suggestion on reducing noise (to avoid confusion with real stars)?
My camera
1/1000s to Bulb
f2.8 - 8
ISO 80 - 400
Thanks in advance