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Weird splotch in the middle of my final images

Astrophotography Imaging
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#1 Dangerous_Space

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Posted 09 December 2023 - 06:53 PM

I seem to notice this foggy splotch in the middle of my pictures (see picture) and i never really notice it until after ive stacked and started my stretching. I have a feeling its dew and while I dont have a dew heater (rather i have a hand warmer tacked on to the edge of my kit lens with painter's tape) I never really see or notice dew when i go outside to check or take in my stuff. In case it may be for other reasons and not dew. I shoot from bortle 5-6 skies, this specific picture was on a moonless night, and my subs were 2min with a 55mm-250mm kit lens (set to 200mm) at f/5.6. Please help cause this is the second time this has happened and the last time was when i drove 3 hrs to a dark site and i didnt even get to see the result. Thank you and i apologize if this is the wrong forum as i am new. (first post woohoo!)

https://drive.google...iew?usp=sharing

I tried making the file small enough to show here but it was still sto big so i just sent it through drive but its still very lowquality.

OH! If you know what is causing this or how to fix it when shooting/post processing, please let me know!



#2 Tulloch

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Posted 09 December 2023 - 06:56 PM

I can't see the image due to permissions on your google drive, but it's probably a dust bunny. Just post a low resolution jpg below, that will help.


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#3 Dangerous_Space

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Posted 09 December 2023 - 07:16 PM

I can't see the image due to permissions on your google drive, but it's probably a dust bunny. Just post a low resolution jpg below, that will help.

I cant seem to get the picture uner 500kb so i updated the sharing preferences, can you see if it has worked?



#4 Tulloch

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Posted 09 December 2023 - 07:55 PM

I cant seem to get the picture uner 500kb so i updated the sharing preferences, can you see if it has worked?

Aaah. Hmmm. Yes I can see it now. I don't know what's causing that, but I made a smaller version so you can display it here. Hopefully someone else can help...

 

DEMONSTRATIONFILE small.jpg


Edited by Tulloch, 09 December 2023 - 07:56 PM.

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#5 Dangerous_Space

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Posted 09 December 2023 - 11:10 PM

Aaah. Hmmm. Yes I can see it now. I don't know what's causing that, but I made a smaller version so you can display it here. Hopefully someone else can help...

 

attachicon.gif DEMONSTRATIONFILE small.jpg

Thank you, this is the heart nebula and its only 50 or so frames but i plan over the next month to grab as much data as i can to create a better, less noisy picture. i only have so many clear nights til christmas so i hope i can get it done before then as i plan to print it out as a gift. whenever this happens though it sets me back an entire day.



#6 arbit

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Posted 09 December 2023 - 11:37 PM

Quick check - is the stack calibrated?

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#7 Dangerous_Space

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Posted 10 December 2023 - 04:13 AM

Quick check - is the stack calibrated?

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Yes it is, i should have specified so my bad, i have flats, darkflats, darks, and biases



#8 Tapio

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Posted 10 December 2023 - 05:27 AM

Don't know if it will cure your problem but you have dark flats and bias.
One of them is too much and if it's DSLR you're having then I would lose dark flats.
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#9 Dangerous_Space

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Posted 10 December 2023 - 09:22 PM

Don't know if it will cure your problem but you have dark flats and bias.
One of them is too much and if it's DSLR you're having then I would lose dark flats.

so restack without darkflats?



#10 Tapio

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Posted 11 December 2023 - 12:18 AM

so restack without darkflats?


Yes. I'm not sure if it helps, but you should not use both for calibration.

#11 Dangerous_Space

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Posted 11 December 2023 - 01:05 AM

Yes. I'm not sure if it helps, but you should not use both for calibration.

it didnt work, i didnt notice a difference but ive never rlly noticed it playing a role with any other picture ive taken



#12 Dangerous_Space

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Posted 11 December 2023 - 01:33 AM

Yes. I'm not sure if it helps, but you should not use both for calibration.

you think it might be too long of an exposure time? never had this issue until i started shooting at 2 minutes, my raw files are abt over half way on the histo




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