I noticed some hot pixels on my D700. They are very visible on the LCD, but seem to disappear when I look at them in CS2 (after converting to DNG). You can see them in Adobe RAW until the image finishes loading (when the ! symbol disappears) then they magically vanish.
I'm sure they are not on the LCD, because shooting vertical and horizontal yields the same hot pixel in the same spot.
Adobe Bridge loads the embedded JPEG (generated by your D700) and then replaces it with it's own quick conversion of the RAW data to JPEG. Adobe and some other converters (but not NX) map out hot pixels automatically. Hot pixels come and go, whereas dead or stuck pixels are permanent. You probably have some hot pixels and if they are not affecting your images because you are using Adobe to do the conversions, then there's nothing to be concerned about. Just keep an eye on them and if they persist then in a few months you might go ahead and send the camera to Nikon to have them mapped out -- just make sure that the pixels are in the same location and not just randomly occurring before you send the camera to Nikon to have the problem addressed.
Zoom in on the spots in Photoshop (at least 200%). And, as mentioned already, look at multiple images at the same pixels. From my experience, they're usually red, white, or blue. Make sure you also note the pixel coordinates in PS. Nikon's more likely to believe the hot pixel story if you include them. Also, some forms of post processing and iso levels bring them out more than others. On my D200, anything above ISO400 brought out those hot pixels quite frequently, as well as anything that boosted highlights.
If you do send it in to Nikon, make sure you do it before your warranty expires. They charged me ~$200 to remap my D200 out of warranty.
I have one particularly bad hot pixel that gets redder the higher the ISO, but I can see them even at ISO 100. I really don't want to be out of my camera for a while, but I shoot JPG and this is really pissing me off.
Depending on how bad and persistent they are, I wouldn`t even bother.
I felt silly after I returning a camera several years ago because of one hot pixel out of several millions. especially if they dissapear after uploading to a computer.
However it`s up to you, good luck.
This worked for me on a D300 that had 3 hot pixels. I set the menu to give me immediate access to the sensor cleaning, than placed the camera in BULB mode, pushed down the shutter for at least 20 seconds, then as soon as I released the shutter immediately went into sensor cleaning mode twice in a row. Strangely enough this mapped out the dead pixels....they were flat gone and not seen again. It's worth a try. Thus far I haven't seen any dead pixels on my D700.
Just about every Nikon DSLR coming out of the factory has dead or hot pixels. If you are under warranty send it to Nikon repair and they will map them out for you (or replace the sensor if there are too many). It's a shame that Nikon doesn't perform this service during the manufacturing process. If you use Photoshop and shoot raw it will remove them automatically. My brand new out of the box D200 has about 10 hot pixels and Nikon service replaced the CCD and mapped out all bad pixels. Unfortunately this won't last and most likely more hot pixels will show up over time.
traveler wrote:
This worked for me on a D300 that had 3 hot pixels. I set the menu to give me immediate access to the sensor cleaning, than placed the camera in BULB mode, pushed down the shutter for at least 20 seconds, then as soon as I released the shutter immediately went into sensor cleaning mode twice in a row. Strangely enough this mapped out the dead pixels....they were flat gone and not seen again. It's worth a try. Thus far I haven't seen any dead pixels on my D700.
That's pretty incredible. Where did you hear about that?
Oh, it was quite a while back I found a link from some folks over in Europe that found out this was one way to map out dead pixels. It like so many operational things was not a documented procedure by Nikon. Makes me wonder what procedure they use at the factory themselves. Perhaps much the same. The extended time holding the shutter down allows the circuit to detect the hot pixels, and I suppose by dovetailing the sensor cleaning directly afterward allows the removal of same. All I can say is it worked for me (as apparently it also worked for many on this site I read it on as well.) Give it a try. It costs you nothing.....
traveler wrote:
Oh, it was quite a while back I found a link from some folks over in Europe that found out this was one way to map out dead pixels. It like so many operational things was not a documented procedure by Nikon. Makes me wonder what procedure they use at the factory themselves. Perhaps much the same. The extended time holding the shutter down allows the circuit to detect the hot pixels, and I suppose by dovetailing the sensor cleaning directly afterward allows the removal of same. All I can say is it worked for me (as apparently it also worked for many on this site I read it on as well.) Give it a try. It costs you nothing........Show more →
I don't have any, so can't fuss with it. But, I gotta say that if this procedure worked and was used by nikon service centers, I can't imagine why in the hell it wouldn't be in the book.... They don't make money by spending tech time servicing stuff, they lose money. Something as easy as this would certainly be announced and utilized, cuz unlike the lens adjustment feature, you can't hardly screw it up.
It doesn't make much sense to me though. The sensor and the cleaning system shouldn't even be linked together electronically. There is no logical reason for linking them. The cleaning system sends sonic booms down the glass AA filter, not the sensor. The sensor doesn't care if the AA filter or sonic boomer are even there.
My guess would be that if it worked, it worked simply because the long shutter time caused stuck pixels to unstick.
In modern (the past 3 or 4 years) cameras, the ability to have the pixels mapped is not even a thought for most converters to 'fix'. ACR simply over writes them with 'good' information.
traveler wrote:
Oh, it was quite a while back I found a link from some folks over in Europe that found out this was one way to map out dead pixels. It like so many operational things was not a documented procedure by Nikon. Makes me wonder what procedure they use at the factory themselves. Perhaps much the same. The extended time holding the shutter down allows the circuit to detect the hot pixels, and I suppose by dovetailing the sensor cleaning directly afterward allows the removal of same. All I can say is it worked for me (as apparently it also worked for many on this site I read it on as well.) Give it a try. It costs you nothing........Show more →
I could hug you.
Your tip just eliminated the nasty green hot pixel I had.
I had two hot pixels on my D300 last week. I did a sensor clean. Then set the camera to 6400 iso and with the lens cap on took three 10sec exposure photos. The hot pixels disappeared!!!
Much quicker and cheaper option than sending back to Nikon
Now somebody do it without the sensor cleaning step just to prove that it's due to powering the sensor for such a long time and nothing to do with an irrelevant filter-shaking step that has nothing to do with pixels!
