Night Testing. Long Exposure Experiment.

[vikingsail]

Today i took my Yi with me when i'm on my bike.
I went to the river side to watch the conjunction of Venus and Jupiter. Since they are only 0.5° from each other on the sky sphere.
Here are some pictures i took with the Yi camera. No post process at all.




I'm impressed by the 4k image the Yi cam took. Very good quality for a dark situation.

===================================Long Time Exposure Test=====================================
After i got back home, I used some scripts to test the long exposure of the Yi cam.
here are some imagines.








The result shows nothing too good: the noise is regular. as you can see from 4 photos. some noise are always on the same spot. the brighter the image is, the more obvious the noise is.

There is a way around though. By using professional image stacking software like DeepSkyStacker or StarStaX (THEY ARE FREE!!!!!!!!), you can reduce or even erase the regular noise. Just simply take the normal long exposure photos and also take "dark field" exposure photos with the same environment. The stacking will compare the images and erase whatever spot appears on the black image.

Links to the software:
http://www.markus-enzweiler.de/StarStaX/StarStaX.html
http://deepskystacker.free.fr/german/index.html
http://www.startrails.de/html/software.html

HAVE FUN WITH YOUR YI CAMERA!!!

 

[Squeamish]

... Here are some pictures i took with the Yi camera. No post process at all...

What were the exposure times you used and how did you set them?

 

[MonsterVM]

It's beautiful place you got there. Wish I can get out of the city and capture some night image. Another way of reducing noise is using photoshop median method.

 

[Savier]

Hi. Thank you for your post, I am amatour with such photography things but really enjoy results . Also feel sorry that it will be difficult to apply this method to nightlapse with stars -long exposure photo > no noise photo > long exposure etc. But I will test it!

 

[vikingsail]

What were the exposure times you used and how did you set them?

it was 7.9 second. by using the popular autoexec.ash script. it's very easy.

 

[vikingsail]

It's beautiful place you got there. Wish I can get out of the city and capture some night image. Another way of reducing noise is using photoshop median method.

thank you.
I know the Median method. The problem is that only reduces those random noises. The regular ones will get even more obvious if you know what i mean.
What the Median calculation does is, it calculates every pixel of the image and get a average number of each place. then compares each pixel with this number to determine if it's noise or the right exposure.
That explains what i said above.

 

[MonsterVM]

I know what you mean, those noise that are not random right. Maybe I will try the software you mention soon if I find the right place to do timelapse.

 

[pablo ortega]

it was 7.9 second. by using the popular autoexec.ash script. it's very easy.

what ISO did you use?

 

[vikingsail]

what ISO did you use?

it was 200. with 7.9s exposure time.

 

[Jamesetas]

You can set the automatic exposure time of more than 1/2 seconds in time lapse mode?

I use a script that blocks the ISO to 100. In the script the exposure time I have not modified to be automatic, but only keeps the exposure time to 1/2 seconds
Is it possible that the exposure time becomes long? Thanks