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Gear Talk => Technical Support => Topic started by: PixelReaper on January 25, 2012, 01:16:44 AM

Title: Hot / stuck pixels on new 5d II
Post by: PixelReaper on January 25, 2012, 01:16:44 AM
Hi all,

I am new to posting on CR but have enjoyed and learned a lot from reading all of your post, so thanks!

I bought the 5d2 / 24-105 kit over Christmas and have been really loving it!! I also added the 35L to my nifty fifty and am very satisfied withy current kit. I would love to add a tele zoom, but that will be another post.

Today I started noticing some hot pixels showing as either solid red, white or blue. I did a shot of lens cap at both high and low ISO and counted a total of about 7 stuck pixels on the LCD on the camera. I also tried the manual sensor cleaning trick, but had no luck. I am still in my amazon return period and I am thinking about just sending it back for a new one.

Does anyone have experience with this issue and have any adivice?

Thanks in advance for your help!
Title: Re: Hot / stuck pixels on new 5d II
Post by: jstn on January 25, 2012, 01:50:10 AM
My 7D has a very large green/red (depending on aperture?) hot pixel that is pretty darn evident when shooting video, especially in low light. I've never really seen it pop up in any of my still images, so since I don't do much video it wasn't of much concern. I could definitely live without it though.

If you can see 6-7 of them on a still image, through the small lcd, I would definitely get that thing replaced. If you don't and start shooting video in the future, you will be very angry with yourself. I know it sucks having to send back your new pride and joy, but sometimes you need to demand what your paid for.
Title: Re: Hot / stuck pixels on new 5d II
Post by: Michael_pfh on January 25, 2012, 02:28:27 AM
Send it back as long as you are within the return period!
Title: Re: Hot / stuck pixels on new 5d II
Post by: Tan on January 25, 2012, 02:55:41 AM
Agreed! Send it back! I had to go through two 7Ds before I got a decent one, and it *still* has a couple of hot pixels! But they are only evident on extremely long exposures (or video) so I can live with them.
Nevertheless, it does make you concerned about the Canon quality control...  :(
Title: Re: Hot / stuck pixels on new 5d II
Post by: PixelReaper on January 25, 2012, 06:57:46 AM
Thanks for the direction. Like you said, I hate to send my baby back but at least I caught it with a few days to spare. Thank you both for your replys.
 ;D
Title: Re: Hot / stuck pixels on new 5d II
Post by: Mt Spokane Photography on January 25, 2012, 12:28:45 PM
Hot pixels on the LCD will only get worse with time.  I'd exchange it for a different one.  I've had many digital cameras and never had hot LCD pixels, so it is somethinng out of the ordinary, and a Quality issue.
Title: Re: Hot / stuck pixels on new 5d II
Post by: bvukich on January 25, 2012, 01:29:24 PM
I'd return it for sure.

But just to make sure we're all talking about the same thing...  Is this hot pixels on the sensor, that you can see when reviewing on the LCD, or is this pixels on the LCD that are stuck on?

On an LCD of that size, there is no excuse for a stuck on pixel.  Stuck on is significantly more distracting than stuck off, and it is obviously defective.

On a sensor, there will always be a few hot pixels, and will usually get worse as sensor temp increases (video, long exposure, live view).  You just have to determine if the number present on your sensor are acceptable to you.  If you are asking the question, then it probably isn't.

Like I said at the top, return it.
Title: Re: Hot / stuck pixels on new 5d II
Post by: sb on January 25, 2012, 02:31:41 PM
Hot pixels on the sensor are quite normal, there is no need to exchange the camera because you will get them over and over again no matter how many cameras you go through. It's not a problem with quality control, unless you're talking about scores of pixels every time you take a picture of a black backdrop.

Number of hot pixels goes up with longer exposures, and are more noticeable when your background is black. The lens cap test you did is the perfect example of this. Take exposures of different durations and compare the results on the screen. BTW, on the computer screen you will notice many more pixels than you do on the LCD on the camera :-) I can tell you that my 5Dmk2 behaves exactly the same, and so do all my other bodies. It's just a fact of life.

Just make sure you're not getting too many hot pixels during shorter exposures though (i.e. shorter than 1 sec)
Title: Re: Hot / stuck pixels on new 5d II
Post by: motorhead on January 25, 2012, 02:38:47 PM
Sorry to say as pixel counts go ever higher, so do the number of hot/dead pixels. It's a fact of life.

Unless they impinge on a print they get ignored, even if I need to clone one out during post processing its such a simple job I often don't realise I've done it.
Title: Re: Hot / stuck pixels on new 5d II
Post by: PixelReaper on January 25, 2012, 02:50:44 PM
I am referring to hot pixels on the sensor, not the LCD. If it were happening only after prolonged sensor usage or only at very high ISO, I would be more understanding, but in this case they show up right away and at very low(200) ISO settings/relatively low shutter speeds (1/10).

So I just ordered a new 5dII / 24-105 kit from amazon, still at $2799 and sending the first kit back. I know I might just be pixel peeping, but hopefully the new body doesn't exhibit the same issue ? 

I will have to remove the giottos LCD screen protector off the one I'm sending back.  I have read you have to use a hair dryer to loosen the adhesive.  Does any one know if it can then be reapplied to another LCD?

Thanks again to all that have posted.
+1 CR community!!
Title: Re: Hot / stuck pixels on new 5d II
Post by: well_dunno on January 25, 2012, 03:06:07 PM
To my knowledge, hot pixels on the sensor is normal and something we need to live with - as it was mentioned earlier in the thread, their number would increase with longer exposures...

I also recall reading individual pixels might be "hot" for some time and then stop being hot (even at the same level of exposure). Nothing regular I imagine... I have been trying to avoid looking at images at 100% so no first hand experience on that.

I do not think a hot pixel on the sensor could be visible on the LCD though. Can anyone confirm?

Cheers!
Title: Re: Hot / stuck pixels on new 5d II
Post by: PixelReaper on January 25, 2012, 03:17:54 PM
To my knowledge, hot pixels on the sensor is normal and something we need to live with - as it was mentioned earlier in the thread, their number would increase with longer exposures...

I also recall reading individual pixels might be "hot" for some time and then stop being hot (even at the same level of exposure). Nothing regular I imagine... I have been trying to avoid looking at images at 100% so no first hand experience on that.

I do not think a hot pixel on the sensor could be visible on the LCD though. Can anyone confirm?

Cheers!

They show up on the same spot on the frame/image every time. I am not sure what % of full magnification the LCD preview provides compared to viewing at 100% on the computer, but they can definatley be seen on the LCD preview.

I also spoke to Canon support and they said the sensor can be fixed by turning those pixels off (remapped sensor?) but when I mentioned I was still in the return period, I was surprised that the canon rep seemed to encourage replacing the camera vs sending it in for repair under warranty.
Title: Re: Hot / stuck pixels on new 5d II
Post by: well_dunno on January 25, 2012, 03:28:41 PM
I'd get it replaced! After all, if those pixels are attracting your attention and the cam is still in return period, why not?..

Title: Re: Hot / stuck pixels on new 5d II
Post by: sb on January 25, 2012, 03:38:45 PM
Manufacturing variations will cause certain pixels to exhibit more leakage than others. This is why you always see the same pixels light up - because they are "inferior" compared to the rest and give out (leak charge) sooner.

When you get your new camera you'll see that different pixels will light up , but you will ALWAYS have this problem to a certain degree (even if you jump to Nikon :-))

Remapping will remove the problem because your camera will simply stop using those "weak" pixels (instead it will clone the data from a surrounding pixel), but if you then attempt an longer exposure, you will notice that some other new pixels are starting to light up. It comes down to what you can live with. You will become more lenient with time, trust me :-)
Title: Re: Hot / stuck pixels on new 5d II
Post by: PixelReaper on January 25, 2012, 03:55:25 PM
Manufacturing variations will cause certain pixels to exhibit more leakage than others. This is why you always see the same pixels light up - because they are "inferior" compared to the rest and give out (leak charge) sooner.

When you get your new camera you'll see that different pixels will light up , but you will ALWAYS have this problem to a certain degree (even if you jump to Nikon :-))

Remapping will remove the problem because your camera will simply stop using those "weak" pixels (instead it will clone the data from a surrounding pixel), but if you then attempt an longer exposure, you will notice that some other new pixels are starting to light up. It comes down to what you can live with. You will become more lenient with time, trust me :-)

Thanks sb. I am sure you are right on both the body and the leniency over time.  I have been shooting as an amateur for about 7 yrs, I started with a 350d. This was my first upgrade other than buying a 50 1.8 to replace the kit on the 350d. As you can tell from the small fortune I have spent in the last 2 months on new equipment, I have clearly fallen deep down the rabbit hole!! I will say the 5DII and L glass IQ has really moved me to learn more about how to be a better photographer from both a tech  and artistic / composition standpoint
Title: Re: Hot / stuck pixels on new 5d II
Post by: Canonmobile on January 25, 2012, 08:18:33 PM
My input is not a solution but an illustration of hot pixels.
I took my 5dm2 to the beach last summer in July (Virginia Beach). My friend and I were doing some experiments in long exposures at night and the temperature was around 90-degrees.
The evening's experiments started out fine, but the longer we were there and the longer we set our exposures the more hot pixels we had.
By the end of the evening, I bet there were a hundred hot pixels. Our experiment failed, but our education about hot pixels was interesting.
The hot pixels were gone and have never come back....they weren't there before either. The ambient temperature and the long exposures were the culprit. As stated above....you have to learn to live with occasional hot pixels. Of course, if they are there in optimum circumstances...you might want to have them checked out and remapped during the warranty period.
Title: This quick and easy fix has worked for me and lots of others...
Post by: WillShootPhotos on January 27, 2012, 04:58:57 PM
...no need to send the camera back, just do this fix. Found this back in 2008 for a 40D but has worked on other bodies since...


Can read more here - but the fix is above...
http://blog.willshootphotography.com/2008/10/canon-50d-hot-p.html (http://blog.willshootphotography.com/2008/10/canon-50d-hot-p.html)

Good luck!

- Will
Title: Re: This quick and easy fix has worked for me and lots of others...
Post by: Tijn on January 28, 2012, 06:12:23 PM
...no need to send the camera back, just do this fix. Found this back in 2008 for a 40D but has worked on other bodies since...

  • Remove the lens and put the body cap in place on the camera
  • Put the camera in to "manual sensor cleaning mode". It is the same for both the 40D and 50D - Press the "Menu" button, then select the middle "yellow wrench" tab, then "Sensor Cleaning" then "Clean Manually".
  • You will hear the click of the mirror coming up (so you *could* be using a swab on the sensor - but don't do that - leave the body cap in place).
  • Leave the camera in this mode for 30-60 seconds, I kept it this way for closer to 60 seconds.
  • Power off the camera off - you should hear another click as the mirror drops down into place

Can read more here - but the fix is above...
http://blog.willshootphotography.com/2008/10/canon-50d-hot-p.html (http://blog.willshootphotography.com/2008/10/canon-50d-hot-p.html)

Good luck!

- Will
Hurray indeed. I just got a new 60D camera, also a hot pixel in it, quite visible in video and some pictures. Did this thing (for me, I kept the mirror up for closer to 35 seconds), powered off, mirror moved back into place. Powering back up, hot pixel gone. Lovely :-)
Probably want to block the viewfinder as well while doing this though, to prevent any stray light coming in.
Title: Re: Hot / stuck pixels on new 5d II
Post by: christodoulidesd on December 08, 2012, 05:17:47 PM
Wow! Can't thank you enough! Have a brand new 7d and had a white dead pixel ontop of the videos (1080p) on the left and it disappeared! Here's what i did:

Like i read above:

Put the camera in manual mode.
Set iso to 1600-3200, let it warm up for 2-3min (only first time)
Remove lens and put body cap on.
Turn off the camera.
Remove battery and put it back in.

1.keep the body cap on
2.set your camera to manual sensor cleaning
3.keep it on for 10 to 20 sec. (I left it for about 20 seconds)
4.turn it off

DONE! Can't thank you enough!
Title: Re: Hot / stuck pixels on new 5d II
Post by: extremeinstability on December 08, 2012, 06:49:04 PM
May wind up wishing you could trade back for this only 7 hot pixel one.  7 sounds great lol.
Title: Re: Hot / stuck pixels on new 5d II
Post by: city_zen on December 08, 2012, 09:41:08 PM
A few months ago I was trying to fix some hot pixels on my humble EOS 550D (actually a Rebel T2i, since it was bought in the USA). I had discovered those hot pixels while shooting video, where they are more evident than on stills.
While searching for solutions, I came across  an old but still working little utility that's ideal for testing your camera's sensor for hot and dead pixels:

Dead Pixel Test (http://www.starzen.com/imaging/deadpixeltest.htm)

It's simple, small and free. Above all, it works

I used to test for hot and dead pixels before and after trying one of the manual sensor cleaning tricks described above.
Title: Re: Hot / stuck pixels on new 5d II
Post by: netoaimar on March 06, 2013, 07:22:26 PM
I'm new here, and I've been looking for a solution to my problem when I found this forum.

Last october I bought a new Mark II and was very happy with it. I use it for work, filming everything from tv ads to weddings.

This last week something came up on my screen. Some purple dots appeared on the center top of my images. It is visible not only in my photos or videos, but also when you turn on the camera on live view. And it appears with any lens I use.

Is this what you guys call hot/stuck pixel?

Here's a photo for you to see.
At first they look like black dots of smudge, but if you zoom in to its original size or more, you can see they're purple/reddish.
http://s23.postimage.org/y8z7ndo4p/camera01.jpg (http://s23.postimage.org/y8z7ndo4p/camera01.jpg)

 I read about laser damage to the cmos, but all images I found are very diferent from what I have.
I tried the sensor cleaning option on the camera, but it didn't do anything for me. Do stuck/hot pixels only appears after the photo is shot or is it already visible in the lcd in live view mode?

Can anyone help me? I'm going crazy here...
Title: Re: Hot / stuck pixels on new 5d II
Post by: Mt Spokane Photography on March 06, 2013, 09:10:49 PM
I'm new here, and I've been looking for a solution to my problem when I found this forum.

Last october I bought a new Mark II and was very happy with it. I use it for work, filming everything from tv ads to weddings.

This last week something came up on my screen. Some purple dots appeared on the center top of my images. It is visible not only in my photos or videos, but also when you turn on the camera on live view. And it appears with any lens I use.

Is this what you guys call hot/stuck pixel?

Here's a photo for you to see.
At first they look like black dots of smudge, but if you zoom in to its original size or more, you can see they're purple/reddish.
http://s23.postimage.org/y8z7ndo4p/camera01.jpg (http://s23.postimage.org/y8z7ndo4p/camera01.jpg)

 I read about laser damage to the cmos, but all images I found are very diferent from what I have.
I tried the sensor cleaning option on the camera, but it didn't do anything for me. Do stuck/hot pixels only appears after the photo is shot or is it already visible in the lcd in live view mode?

Can anyone help me? I'm going crazy here...
You can ask Canon to fix the camera.  They will merely map out the bad pixels so they no longer show up.  As time goes on, its possible that more will appear.  Its not a big issue for still images, since noise reduction removes them easily, but it is a problem for video.