Long exposure D7100: normal amount of hot pixels

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Olaf Marzocchi
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Long exposure D7100: normal amount of hot pixels
5 months ago

Hello, I tried a 6400 ISO exposure outside (7°C), on a tripod, with cap on the lens and cap on the eyepiece, NR off (I was simulating astrophotography conditions).

This is it:

https://dl.dropboxusercontent.com/u/5445378/DSC_0763.jpg

Or, smaller, here (i downsampled 2x, therefore all hot pixels appear white, check the image on Dropbox for more information):

And, just for your entertainment, I did the same indoor, 20°C air temperature. The display was at 25°C because I had a long series of long exposure before and the temperature was therefore stable on the highest value (the camera was vertical, laying on the front of the lens and with the display therefore horizontal, so also bad cooling):

https://dl.dropboxusercontent.com/u/5445378/DSC_0618.jpg

You can see that the number of hot pixels (even at 7°C) is huge. Is it normal?

According to my tests, they appear after 1-10 seconds (depending on the ISO). Unless you plan long series of long shots with your dark frames, always keep NR on!!

 Olaf Marzocchi's gear list:Olaf Marzocchi's gear list
Nikon D7100 Nikon AF-S DX Nikkor 55-200mm f/4-5.6G VR Nikon AF-S DX Nikkor 35mm f/1.8G Sigma 17-50mm F2.8 EX DC OS HSM +1 more
Nikon D7100
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