[D7000] - Problems (Bad Pixels) « Nikon Rumors Forum

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[D7000] - Problems (Bad Pixels)

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studio460

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Akosutic said:
After a little experimenting I found something interesting. For those of you who have hot pixel problems: pit on your lens cap, turn on the live view and increase the iso to about 5000 with the shutter at 50. You should now clearly see your dead pixel. Now, while looking at your screen increase the shutter up to around 320 and watch the dead pixel "disappear". At least for me it does.

Interestingly, as I turned the ISO up on my D7000 (at a shutter speed of 1/50th), my single, red, dead pixel completely disappears in the noise. To even see it, I have to use LiveView magnification. Wait . . . I was about to report at what magnification it becomes visible in the 3" LCD, but now I can't find it anymore! What the . . . ?

Posted 2 years ago #
cubivore

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Akosutic said:
After a little experimenting I found something interesting. For those of you who have hot pixel problems: pit on your lens cap, turn on the live view and increase the iso to about 5000 with the shutter at 50. You should now clearly see your dead pixel. Now, while looking at your screen increase the shutter up to around 320 and watch the dead pixel "disappear". At least for me it does.

this trick kinda works, until you need to shoot lower than 320 :( if you go this route then every shot you take has to be well planned out and ambient light must be tested every time.

Posted 2 years ago #
Akosutic

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studio460 said:
Interestingly, as I turned the ISO up on my D7000, my single, red, dead pixel completely disappears in the noise. To even see it, I have to use LiveView magnification. Wait . . . I was about to report at what magnification it becomes visible in the 3" LCD, but now I can't find it! What the?

To see all dead pixels turn the shutter way down to 1/30 and iso as high as it will go.

Posted 2 years ago #
studio460

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Akosutic said:
To see all dead pixels turn the shutter way down to 1/30 and iso as high as it will go.

Duh. Found it. Then I found another one (blue), this time in zone 1 (center), at ISO 3200 at 1/30th. Center not good. Plus, I'll likely use ISO3200 fairly often in D-movie mode.

Okay, now I'm viewing a 1080p24 video clip that I shot last night at ISO250 on a 1080p 52" LCD monitor. I don't see the two dead pixels at all in the picture.

Now, a test at ISO3200 @ 1/30th:

Just shot a clip at ISO3200. I didn't cap the lens--I just shot a darker area of my desk (but still lit) for a more real-world test. The red pixel I saw at first in the lower part of the screen wasn't visible, but the blue one in the center is very visible. Plus, I now see four more. However, the blue one is the worst (largest, and most noticeable).

My guess is that virtually every sensor of this size, and of this density, will have at least one or more dead pixels. The goal is to probably just find one with no dead pixels in the center (zone 1).

Posted 2 years ago #
cubivore

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the red and green one go away fairly easily, but like yours the blue is the most stuck and most obnoxious, especially since mine is also in the center zone

Posted 2 years ago #
Drab

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cubivore said:
is there any way to fix this in post? it's obviously way easier to correct in pix, but for video?

Yes, this would be easy to fix in post. But you'd need to reencode the video...

EDIT:

I think an easy way to do it for all videos would be to create an image with black pixels where the hot pixels are.
Use avisynth to do an overlay with the overlay filter, set the background of the image to the alpha channel, and adjust the transparency of the overlay to taste. Using the subtract option will darken the hot pixels on the video, running with my assumption that a gray dead pixel is less noticeable than a coloured one.

A more robust, and near perfect solution is again to setup an avisynth filter using the UnDot plugin. It was designed for removing consistent dot noise from film transfers. "It clips each pixel value to stay within min and max of its eight surrounding neigbors" This would do a very intelligent desaturate on the hot pixels and create nearly perfect output.

The basic problem here, though, is that all these steps require reencoding already low-bitrate lossy video. Then again, most serious post production will require the same. Hopefully I'm wrong and Nikon has padded the bitrate enough to reasonably survive one transcode, but I doubt it. You get what you pay for.

Posted 2 years ago #
Doodly

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Dou guys still recommend the D7000 even though it has all the problems? I can't decide >.< its bothering me:(

Posted 2 years ago #
studio460

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Doodly said:
Dou guys still recommend the D7000 even though it has all the problems? I can't decide >.< its bothering me:(

As a still camera, absolutely! Without any statistical knowledge of the frequency of hot pixels on other V-DSLRs, it's hard to say what's average or "acceptable." As I said, I imagine that virtually all sensors of this size and density have a least one or more dead pixels. In pro video cameras, we mostly don't shoot at equivalent ISO values as high as V-DSLRs can go, so they're often not noticed, or aren't as objectionable. High-ISO, V-DSLRs just make these issues more prominent. Again, I don't think it's an issue specific to the D7000. I would guess that it remains an issue with all high-megapixel V-DSLRs.

Posted 2 years ago #
Funduro

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I have serviced digital mammography detectors. Yup we use pixel mapping software to rid of negative and positive contrast pixels. 16 million pixels and the darn Radiologist can pick them one out that is NG. If you expect the sensor to be flawless over it's life you might be overreaching for perfection that doesn't exist. I bet Nikon has a mapping file that can be updated. Having access to it is another story. My 2 cents. BTW I will adopt your D7000 body, I will provide a warm, dry and clean home. No need to give it to your next door neighbor, who would sell it on eBay and buy a PnS.

Posted 2 years ago #
Doodly

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Does/did the D90 also have hot or burnt pixels? because if not i think i'd prefer that over the D7k plus it saves me a lot of $$ :)

Posted 2 years ago #
lightsaver

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Doodly said:
Does/did the D90 also have hot or burnt pixels? because if not i think i'd prefer that over the D7k plus it saves me a lot of $$ :)

Grab a D90 or D5000 (just discontinued) when they go on clearance--you'll get a great deal.

Posted 2 years ago #
Doodly

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lightsaver said:
Grab a D90 or D5000 (just discontinued) when they go on clearance--you'll get a great deal.

I'm just worried it'll all sell out and i wont be able to -.-" lol thats one of the reasons i dont want to wait until clearance :S

Posted 2 years ago #
blckcat

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Just got my D7000 and I tried live view and record video using the same setting that you guys are having problem with and I wasn't able to get any hot pixels nor blue dots. I think its not entire D7000 but some have it.

Posted 2 years ago #
cubivore

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blckcat said:
Just got my D7000 and I tried live view and record video using the same setting that you guys are having problem with and I wasn't able to get any hot pixels nor blue dots. I think its not entire D7000 but some have it.

try setting movie mode to auto and set the mode dial to auto too, then put on the lens cap. turn on live mode and it should go to LO shutter and maybe HI1 or 2, and then reveal something. i hope you don't have any though cos that gives me hope that an exchange might prove favorable! :)

Posted 2 years ago #
jonnyapple

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Doodly said:
Does/did the D90 also have hot or burnt pixels? because if not i think i'd prefer that over the D7k plus it saves me a lot of $$ :)

Yes, my D90 had a noticeable stuck pixel very near the center (~20% down the frame from dead center). It was never an issue for me with stills as lightroom automatically removes them if you shoot raw. I never shot really serious video with my D90, but I can see how that would be annoying.

My D300 had four or five that would show up at higher ISO settings, and my D100 had a -lot-, some of which were there at base ISO.

I have heard that Nikon will map stuck pixels for you if you send it in for servicing. I've never done it myself.

Posted 2 years ago #
Michael DeRose

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just found one hot pixel to the far left. I think i lucked out. It is rather close to the edge.

Posted 2 years ago #
MCucuzza

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New problem with my D7000...

My D7K will not recognize non af-s lenses. In fact if you install a non-AF-s lens it will not turn on, no buttons will react at all.

The lens that I am trying to use is a 24-70mm sigma non hsm. If I connect it with the camera already turned on it doesn't recognize that anything has changed and all camera buttons go inoperable. If I connect it with the camera turned off and then turn it on the camera is completely unresponsive...

Does anyone have any suggestions. Is there a setting that I need to change.

The lens works fine on my d80 and d90, but does nothing on the D7000?

Posted 2 years ago #
jasnfunman

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I have been using my D7K for 3 days now and am finding action sequences very hit or miss in AF. Shots that I normally can capture with far lesser equipment are coming up not in sharp focus...ie kids running through waves etc. Im approx 1000 shots in and am wondering if anyone else is having this issue? I honestly was hoping it was close to the Canon 7D based on all of the press...but Im wondering if this camera just cant do it. Anyone else having speed focus issues? PS - Stills are amazing.

Posted 2 years ago #
MCucuzza

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I am not having that issue. I also only have one hot pixel (dull red in the lower left quadrant consistent through all iso and exposure settings).

Have you tried using non af-s lenses with the camera? Was there any set up (in the settings) involved or just like the D90 etc. just attach and shoot?

Posted 2 years ago #
Krevlin

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I think I've lucked out (knocks on wood) So far I have not had any issues what so ever with my D7000.

Took my Tokina 16-50mm off of my D90 and put it on my D7000 and hit the ground running.

Haven't noticed any hot pixels but they don't really bother me anyway.

Posted 2 years ago #
Drab

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jasnfunman said:
I have been using my D7K for 3 days now and am finding action sequences very hit or miss in AF. Shots that I normally can capture with far lesser equipment are coming up not in sharp focus...ie kids running through waves etc.

Which focus-point selection mode are you in?

Posted 2 years ago #
jasnfunman

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Drab said:
Which focus-point selection mode are you in?

I tried each mode. Oddly the ONLY clear action sequence came from when I utilized the "Pre-Set" sports mode. I found that incredibly odd. I also find it seeking for selection points more than I think it should.

Posted 2 years ago #
Mike Gunter

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studio460 said:
It's not "out-of-range"--it's a defect in one of the pixels on the sensor. On high-resolution sensors, finding two or three dead pixels on a sensor is fairly common.

Hi Studio,

In my lessor video camcorders, from $6000 to 15000, I don't get this - and less I'm being misunderstood, I'm not being snide. I think Studio is referring to extremely-end ARRI/Panavision $250K models.

My point is that a 'dead pixel' is a dead pixel - _if that is what it is_. It should show up on stills, movies whatever. It's not going away regardless of what happens if you change ISO or the light changes.

Dead is dead. Resurrection is saved by few. ;-)

My guess is that something else is afoot. Likely a manifestation of noise that the internal processing is trying to make sense of in dealing with the nothingness of black, or absence of enough light to process.

Just a guess.

My best,

Mike

Posted 2 years ago #
Drab

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Or stuck pixels are mapped in the photo pipeline but not in the video pipeline.

There are all sorts of possibilities, but while the evidence collected so far does not prove they are truly stuck pixels, there has been no counter-evidence (signs of said pixels moving) and the "stuck pixel model" is valid enough to point to existing procedures to deal with them until that point in time Nikon acts and (possibly) invalidates the model.

Posted 2 years ago #
The Man From Mandrem

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I'm still waiting my camera so curious if there is a growing concensus already from those who got theirs on the issues and benefits.

Let me summarize what is posted on internet, solicit feedback:

Issues on AF and lense compatibility which I assume would either be a learning issue or a firmware fix.
Comments about dead pixels but searching internet, that seems to just imply that D7000 is a DSLR (They all seem to have these issues).
There are comments about Birds in Flight photography not being easy, but posted images of good shots of birds by other, so again seems like a learning issue or a firmware fix.
There are comments about lack of sharpness but then very sharp images posted in other places, though default sharpness seems to be set low possibly because the scale goes to 9 but you can't really go above 6 practically?
Contrast there are some comments on, but other images and videos look good. Is this a default setting issue, a non-issue or is there really something going on?
More diffraction with higher resolution sensor which apparently is intrinsic in higher pixel density and just shows less than 1 stop smaller aperture earlier than in previous models.
Mushy button according to a couple reviews. This one I am curious about. I think my N70 is pretty mushy until you get close to where you trigger the shutter. Is that what they are talking about? D90 was stiffer to that point or just the pro models were?
High ISO performance --> So far not seeing anything contadicting the much improved ISO other than few posts talking about more noise?
Video: Seems to be noisy AF for some people, way less jello (same comment also came from Chase Jarvis site). There is image comparing to 7D trying to show image is washed out on internet. Curious about this one. Looked like a 7D love fest site, but again image was posted so looking for some thoughts.

For me, the key reasons to get camera vs previous model are the higher ISO, less jello. I need to read up on diffraction to understand how to manage that. I don't really do high speed AF much. Mainly the comments on contrast and sharpness were things that kind of scared me, but on the sharpness there are enough sharp images I am less concerned. On the contrast, as well, only couple comments and many images that seem to disagree but no direct comparisons.

Please advise.

Posted 2 years ago #