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Sensor dust on moon shots?
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Jan 21, 2019 17:43:08   #
Longshadow Loc: Audubon, PA, United States
 
larryepage wrote:
Dust on the sensor should appear as dark spots where the particles have blocked light from reaching the sensor. Dust on the lens or filter should either be invisible at your focal length or very fuzzily out of focus. I'm thinking that they are most likely "hot pixels." Keep watching for them in low key images and see if they are always in the same place. If that's what they are, all sensors have a few of them....either now or down the road. You'll just have to process them out if they are objectionable to you.
Dust on the sensor should appear as dark spots whe... (show quote)


I agree. Sensor dust will yield gray or black spots, these look like hot pixels.

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Jan 21, 2019 22:30:44   #
wbchinook Loc: Everson WA
 
Thank you everyone. I am going to take a couple of pictures tonight and see if I can find a pattern of bright spots. That would mean some some hot pixels are present. If I find any new information, I will let everyone know.

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Jan 22, 2019 06:54:11   #
AirWalter Loc: Tipp City, Ohio
 
Bill_de wrote:
When you said dark background I didn't realize you were talking about the subject. My bad.

The moon really has a lot of bright spots, not just in you photos. Check this out. Scroll to the 4th picture.

https://www.syfy.com/syfywire/a-bright-spot-on-the-moon



Holy cow - - - when I got to the third picture I immediately thought there was a tiger laying there. Our eyes and minds play tricks on us.






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Jan 22, 2019 06:57:23   #
Longshadow Loc: Audubon, PA, United States
 
wbchinook wrote:
Thank you everyone. I am going to take a couple of pictures tonight and see if I can find a pattern of bright spots. That would mean some some hot pixels are present. If I find any new information, I will let everyone know.


Please do, as many people do not.

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Jan 22, 2019 07:20:13   #
Blaster34 Loc: Florida Treasure Coast
 
wbchinook wrote:
I stepped outside and was surprised to see the moon here in the Pacific Northwest. I grabbed my Panasonic G9 and took a few hand held shots with the Pano 100-400mm lens at 400mm. This is of course the equivalent of a 800mm FOV in a FF camera. I have mixed emotions on the results of my endeavor.

My question pertains to the bright dots that are visible against the dark background. Would dust on the sensor show up this way?
I don't believe there are any stars between the earth and the moon LOL.

Thank you for your insight.

Wayne
I stepped outside and was surprised to see the moo... (show quote)



I see a few white dots but when expanded, many more....Stars?

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Jan 22, 2019 07:28:05   #
Longshadow Loc: Audubon, PA, United States
 
Blaster34 wrote:
Stars?


No, if you zoom in on the moon there are white dots on the moon.

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Jan 22, 2019 07:37:35   #
Blaster34 Loc: Florida Treasure Coast
 
Longshadow wrote:
No, if you zoom in on the moon there are white dots on the moon.



Thanks LS, I just did and saw that one bright spot at the 1 o'clock position. The photo I took of the Blood Moon the other evening has the stars all over it.

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Jan 22, 2019 07:43:02   #
billnikon Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont
 
wbchinook wrote:
I stepped outside and was surprised to see the moon here in the Pacific Northwest. I grabbed my Panasonic G9 and took a few hand held shots with the Pano 100-400mm lens at 400mm. This is of course the equivalent of a 800mm FOV in a FF camera. I have mixed emotions on the results of my endeavor.

My question pertains to the bright dots that are visible against the dark background. Would dust on the sensor show up this way?
I don't believe there are any stars between the earth and the moon LOL.

Thank you for your insight.

Wayne
I stepped outside and was surprised to see the moo... (show quote)


Those are actually reflections from military equipment left on the moon from a secret war that has been raging on the moon for territory to be claimed by Russia, China, and the US.
NO, really, that is dust that can be removed in post.

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Jan 22, 2019 07:53:12   #
AirWalter Loc: Tipp City, Ohio
 
Blaster34 wrote:
Thanks LS, I just did and saw that one bright spot at the 1 o'clock position. The photo I took of the Blood Moon the other evening has the stars all over it.


Well then You have the same problem whatever it is, but it isn't stars.


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Jan 22, 2019 08:12:27   #
jerryc41 Loc: Catskill Mts of NY
 
How about hot pixels? Probably not.

https://kenrockwell.com/tech/hot-pixels/index.htm
https://www.premiumbeat.com/blog/what-is-a-hot-pixel-and-how-can-you-remove-one/
https://photographylife.com/dead-vs-stuck-vs-hot-pixels
https://www.nikonimgsupport.com/ni/NI_article?articleNo=000001233&configured=1&lang=en_US

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Jan 22, 2019 08:19:04   #
Longshadow Loc: Audubon, PA, United States
 


Okay, stuck pixels then to be technically correct?
But I think most people know to what is being referred.

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Jan 22, 2019 08:44:07   #
R.G. Loc: Scotland
 
The ones that look like #1 on magnification are stuck pixels. The ones that look like #2 (or something similar) on magnification are stars.

PS - Taking an exposure with the lens cap on will show up the hot pixels.

-

#1 - Stuck pixel.
#1 - Stuck pixel....

#2 - Star.
#2 - Star....

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Jan 22, 2019 09:24:11   #
Blaster34 Loc: Florida Treasure Coast
 
AirWalter wrote:
Well then You have the same problem whatever it is, but it isn't stars.




Same problem? A month old camera, sure hope not...I don't see any spots in front of the moon..However, could be wrong, please comment, thanks.


(Download)

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Jan 22, 2019 09:35:41   #
DirtFarmer Loc: Escaped from the NYC area, back to MA
 
The bright spots showing on the moon in the second image are due to neutrinos passing through the moon and interacting with your sensor. Some of the other bright spots outside the moon are also due to neutrinos but you can't distinguish them from normal star images.

And while I'm posting here, would anyone like to buy a nice bridge?

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Jan 22, 2019 09:36:09   #
jerryc41 Loc: Catskill Mts of NY
 
Blaster34 wrote:
Same problem? A month old camera, sure hope not...


Don't sweat it.

"So, what do you do with dead/stuck/hot pixels if you have them? If you only have one or two dead pixels on your LCD, don’t worry about them – dead pixels are a normal fact of life. Think of it this way – a typical 3 inch LCD from Nikon contains 920,000 pixels. A single dead pixel means 0.0001% failure rate with 99.9999% of good pixels. Unless you have more than 2-3 dead pixels and they are close to each other, I would not worry about them. Plus, those dead pixels on the camera LCD will never show up in your images anyway! The same goes for stuck pixels on the camera LCD – don’t worry about them unless you have too many."

https://photographylife.com/dead-vs-stuck-vs-hot-pixels

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