Actually I did... some said it was common. But I also found it to be present at ISO 100 which brought up my curiosity. I also bought this used and wasn't sure if that was something that is commonly divulged and should I be upset about it.
Most threads were about people that had the issue... not bought the camera 2nd hand blah blah blah.
You could have Canon map them out. I sent my 5D in for "the mirror fix" last month and it came back with most of the hot pixels mapped out. I didn't ask for it, they just did it and also cleaned the CMOS and focusing screen (actually made it dirtier!). The pixels didn't bother me these past 3 years but I'll be selling soon and now the buyer won't be able to complain about any stuck pixels!
Nieuport N28 wrote:
so the question remains.......have you tried the sensor cleaning mode yet to see if it goes away.
if that's the only one you see at ISO 3200, then you have nothing to comlain about.........and i'll bet it won't show in a print.
I haven't yet... My body cap is on the wife's Elan II right now in the closet... I have a body cap that I ordered from ebay, thought it would be in the mail today but it wasn't.
I can work around it for sure... it is RED so it does show up pretty bad depending on the shot... but nothing a little PS can't fix... I've fixed MUCH worse!
Found this in another post a week or two ago I don't know if it works but might not hurt to try
1. Remove lend
2. Install camera body cap and power up
3. Make sure battery is fully charged
4. Place the camera in manual sensor clean mode for 5 minutes. Make sure the camera body cap remains in place for the full 5 minutes
5. Turn camera power off
6. Reinstall lens and test at high ISO
7. Problem solved
Gilligan8 wrote:
So this is pretty normal and I shouldn't feel upset with the guy that sold it to me?
I think it's normal. I played with a friend's 5DII for a few days and this thing was peppered with hot pixels. I did this "manual clean" trick and it visibly helped. I also upgraded the firmware, so maybe this helped too.
We talking about a dead pixel that is in the same place everytime at every ISO and shutter speed? Or are we talking about a stuck pixels at long exposures and high iso? There is a difference.
Pavel wrote:
I know for example that canon will not consider a stuck pixel something as warrantied.
Not true... Canon has mapped stuck pixels on my cams under warranty.
You can't remove stuck pixels (x) with the sensor cleaning routine... only hot pixels. And I am not sure if it works on all Canon bodies. Stuck pixels are always noticeble, regrdless of ISO. Hot pixels may be too, but it they usually will be visible at higher ISO's.
EB-1 wrote:
I'm 99% sure that Canon performs the same process mentioned above. They have done that for me a few times at no extra charge.EBH
Mapping out stuck pixels is a little more complicated than that, because they have to localize the pixels first in order to map them out. They will connect it to a computer for that. It takes a while.
Doing things like club photography and stuff at ISO 1600/ISO 3200 has meant that defective pixels is a major issue for me. 1 defective pixel means hours of cloning EVERY shot to get rid of a green mark on someone's face or whatnot. It's not a trivial issue at all, unless you predominately use ISO 100 or something.
As Daan has said, Canon maps out the defective pixels, free under warranty. It IS a manufacturing defect. Sensors cannot be economically made with 0 defective pixels. Every sensor has a defective pixels but they are mapped out ("sensor is calibrated") during the production stage. More unfortunately appear later in the sensor's life, particularly during the first few weeks/months when the defects start appearing (just like how cameras and lenses show any inherent problems present at production earlier in their lifespan)
Red, Green, Blue Pixels are not "Dead Pixels", they are classed as "Defective" Pixels according to Canon. Dead Pixels are black.
They can be removed with a CMOS recalibration (the Canon name for a pixel remap). This is definitely covered by warranty.
The 5D Mark II has a weird phenomenon of White Pixels that form a X or + symbol. Those I am not sure whether they are hot or defective pixels.
Dawei Ye wrote:
The 5D Mark II has a weird phenomenon of White Pixels that form a X or + symbol. Those I am not sure whether they are hot or defective pixels.
Many sensors have those hot white cross pixels, not just the 5D MK II.
stuck pixels = stuck at 255 value regardless of exposure/ISO (white pixels - looks like a white cross when unzoomed)
dead pixels = stuck at 0 value regardless of exposure/ISO (black pixels)
hot pixels = depending on the exposure, but usually at higher ISO's (red, blue and/or green pixels)
.