Space and The wonders/mysteries of The Universe

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Post by Pettytyrant101 Fri Nov 12, 2021 11:33 am

{{ Stunning Lance, great work. Amazing that we can see all that from down here. Even more amazing when you see it captured as well as this. }}

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Post by halfwise Fri Nov 12, 2021 12:57 pm

Why are 25 images better than one long image? Is it because tracking goes off over such a long period? (may have answered my own question)

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Post by Lancebloke Fri Nov 12, 2021 1:23 pm

The tracking is not a problem when you have the correct set up.

Best to think about it from the end goal. To get all of that detail, you have to heavily process the image because there is just so little light coming from 2.5 million light years away in addition to the local stars which are much brighter objects.

So, when you are doing that kind of enhancement, you are also dealing with lots of problems, like atmospheric conditions changing, the sensor temperature of the camera changing, the temperature of your optics (I.e. lens or telescope) which can impact down to a single pixel.

So, the additional pictures plus a lot of calibration pictures are there to remove the noise caused by all of that stuff.
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Post by halfwise Fri Nov 12, 2021 2:31 pm

Just editing because I missed the major part of your answer: changes in temperature of the camera. So shorter shots are more internally coherent. Do you have special software to combine the shots?

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Post by Lancebloke Fri Nov 12, 2021 3:07 pm

Shorter shots will have plenty of noise in them but yes, inherently they would have less. There are a lot of things that introduce noise from the second the light leaves its source all the way to being registered by the camera sensor.

A lot of cameras dedicates to this kind of thing are cooled to very low temperatures (-40c) to help with this.

And yes, I use a special piece of software for stacking aimed at astrophotography called Deep Sky Stacker. I then use Photoshop for the processing.
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