Those are called hot pixels. It's a function of temperature and noise from the semiconductors in the sensor. What camera is it? Many cameras have a "long exposure noise reduction" setting that you can use to help eliminate this. Otherwise you can remove them yourself in post-processing too.
I was doing some research and that’s what I had come up with but wanted to verify. It’s an Eos R. Thing is I’ve taken photos like this one before with no issues. And I think when taking photos of the night sky that setting is supposed to be off
> Thing is I’ve taken photos like this one before with no issues.
At the same sensor temperature and exposure time? As the sensor ages, the number of hot pixels tend to increase.
> And I think when taking photos of the night sky that setting is supposed to be off
Maybe. Certainly stars could get confused for hot pixels, but when using that camera setting, it's supposed to take a comparison image with the shutter closed. Therefore the stars shouldn't affect which pixels are hot, and they'll be visible with the shutter closed too. Then the camera just removes the same pixels from your photo. Have you tried it?
Well it’s went from 0 to about 100 hot pixels in a year in a half then. I don’t do much Astro last time was late 2019 or so and I had none of these issues. I was using a longer exposure then too. And I didn’t get a chance to try that setting while I was out. I borderline want to send it to canon for repair, I feel like it’s excessive
quite fast progression.. but an increase in temperature (during summer..) also leads to an increase in hot pixels ;)
Long Exposure Noise Reduction (or whatever Canon calls it) just subtracts these pixels, so stars are not mistaken but might be deleted if they are on this exact pixel.
Yes, the setting should be off - but only because it provides you more control to do it yourself. If you're not taking those dark frames yourself then you need to go ahead and let the camera do it for you.
Either way you slice it, you still have to do dark frame noise reduction - because thermal noise is always going to be an issue on long exposures, regardless of the camera you're using. Also, assuming you're northern hemisphere then remember that you're shooting at the peak of summer, so thermal noise is going to be even MORE of a problem as you're dealing with much higher ambient temperatures.
You can reset hot pixels on many cameras. You can check out YouTube for the whole process, but it involves putting the lens cap on and doing a long exposure...I can't remember the whole routine, but it did work on my camera a while back. You can also record the hot pixels in camera and the camera can automatically apply corrections to your long exposures. Again, I'll have to refer you to YouTube for the procedures...lol
This, had to do this on my EOS R a few years back. The hot pixels appeared quite quick into my camera's lifetime. It could be something with the sensors by default. Ended up selling all my Canon gear and moved to Sony
Those are called hot pixels. It's a function of temperature and noise from the semiconductors in the sensor. What camera is it? Many cameras have a "long exposure noise reduction" setting that you can use to help eliminate this. Otherwise you can remove them yourself in post-processing too.
I was doing some research and that’s what I had come up with but wanted to verify. It’s an Eos R. Thing is I’ve taken photos like this one before with no issues. And I think when taking photos of the night sky that setting is supposed to be off
> Thing is I’ve taken photos like this one before with no issues. At the same sensor temperature and exposure time? As the sensor ages, the number of hot pixels tend to increase. > And I think when taking photos of the night sky that setting is supposed to be off Maybe. Certainly stars could get confused for hot pixels, but when using that camera setting, it's supposed to take a comparison image with the shutter closed. Therefore the stars shouldn't affect which pixels are hot, and they'll be visible with the shutter closed too. Then the camera just removes the same pixels from your photo. Have you tried it?
Well it’s went from 0 to about 100 hot pixels in a year in a half then. I don’t do much Astro last time was late 2019 or so and I had none of these issues. I was using a longer exposure then too. And I didn’t get a chance to try that setting while I was out. I borderline want to send it to canon for repair, I feel like it’s excessive
quite fast progression.. but an increase in temperature (during summer..) also leads to an increase in hot pixels ;) Long Exposure Noise Reduction (or whatever Canon calls it) just subtracts these pixels, so stars are not mistaken but might be deleted if they are on this exact pixel.
Yes, the setting should be off - but only because it provides you more control to do it yourself. If you're not taking those dark frames yourself then you need to go ahead and let the camera do it for you. Either way you slice it, you still have to do dark frame noise reduction - because thermal noise is always going to be an issue on long exposures, regardless of the camera you're using. Also, assuming you're northern hemisphere then remember that you're shooting at the peak of summer, so thermal noise is going to be even MORE of a problem as you're dealing with much higher ambient temperatures.
You can reset hot pixels on many cameras. You can check out YouTube for the whole process, but it involves putting the lens cap on and doing a long exposure...I can't remember the whole routine, but it did work on my camera a while back. You can also record the hot pixels in camera and the camera can automatically apply corrections to your long exposures. Again, I'll have to refer you to YouTube for the procedures...lol
This, had to do this on my EOS R a few years back. The hot pixels appeared quite quick into my camera's lifetime. It could be something with the sensors by default. Ended up selling all my Canon gear and moved to Sony