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What can cause changes in luminosity in astro-images?

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#1 jfredolay

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Posted 22 October 2018 - 09:43 AM

Usually, when I've taken a collection of photos of a particular DSO, I've noticed that the brightness of the images changes or jumps. This is usually seen as the histogram moving to the left and then back to its starting place as I cycle through the images. Does this happen to anyone else? What might cause this phenomenon? 

 

Equipment:

Canon T5; modified with a light pollution filter

Orion 8" astrograph

Atlas EQ6

Guiding setup


Edited by jfredolay, 22 October 2018 - 07:04 PM.


#2 ManuelJ

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Posted 22 October 2018 - 09:47 AM

Clouds. Welcome to the club.


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#3 APshooter

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Posted 22 October 2018 - 04:24 PM

That, or light pollution as the image tracks across the sky.



#4 Jon Rista

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Posted 22 October 2018 - 04:57 PM

Light pollution itself can change. Even with a cloudless sky, LP changes at certain times...for example, as people get off the roads, LP from car headlights will fade out. As people go to bed, LP from home lighting will peter off. If there is any kind of event in the evening, you may find that LP increases while people drive to the event, then fades, then increases again after the event and people drive home (depends on how many people fit the event, sports games often result in quite a few additional cars on the road). Sports field lights can also have an impact during sports events. I usually find that my background sky levels are higher earlier in the evening, and peter off until about midnight or so, then they level off until early morning when both increased traffic for early AM risers as well as the encroaching twilight brighten things again.


Edited by Jon Rista, 22 October 2018 - 07:28 PM.

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#5 Alex McConahay

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Posted 22 October 2018 - 06:02 PM

Temperature might also have an effect. 

Alex



#6 pfile

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Posted 22 October 2018 - 09:29 PM

and of course your friend and mine, the moon, can cause this as well...

 

rob


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