New Items

Canon T6 Sensor Issue

Published April 30, 2015

NOTE: As of May 8th, Canon has issued a recall of affected units. My hat is off to them for superb Customer Care. I didn’t dream it could be done this quickly. 



Every once in a while we notice something, because of the large quantities of cameras and lenses we buy, that we think people should be aware of. This particular issue won’t affect our renters; we’ve sent the affected cameras back. It may not affect very many people at all, since this is from a relatively small sample size. But I still think it worth mentioning.

The bottom line is that 4 of the Canon T6s and 2 of the T6i cameras we received had to be sent back because of a defect in the sensor stack (the layers of filter glass over the sensor). This is out about 10 copies of each; the others were absolutely perfect.

The affected cameras all had a dramatic pattern that at first we thought was oil or dust on top of the sensor glass.


Affected Canon T6s sensor, 2015


But when the techs couldn’t clean the ‘dust’ off, they alerted us. Closer examination with a 10X microscope show the spots are inside, within the stack and under the top layer of glass. I would assume it’s a defect in the adhesives used to put the layers of glass together, but I don’t know for certain. One person has suggested there may have been dust on the glass when the adhesive was applied, which seems logical, but again, I have no real knowledge of how it happens.

The affected cameras all looked exactly the same, so I won’t bore you with more images. It’s quite easy to see, even without a sensor loupe, so don’t make yourself crazy trying to find it on your camera; if it’s there, you’ll notice it. Actually it’s easier to see without a sensor loupe. Angled light seems to show it up very clearly, lights shining directly down on the sensor not quite as much. The other cameras had no signs of this at all, so it was either a ‘yes’ or ‘no’ situation. We didn’t see any cameras with just a few dots.

We took a number of images to see how much they would show up on an actual photograph. In wider aperture shots, as you’d expect, they don’t show up at all. At about f/11 to f/16, taking pictures of sky, clouds, or a well-lit white wall, they do become apparent, but they aren’t as bad as I would have expected.

They’re also have a very different appearance than dust on the sensor does. These have have a ringed, or target appearance rather than the dark blob that sensor dust has. Below is a 100% crop from the corner of the camera with the sensor pictured above. Remember, this is an f/16 image of a clear sky. In a regular photograph at wider apertures I doubt you’d notice it.


f/16 sky image from affected camera. Lens, 2015


Here’s another image that is contrast boosted quite a bit, showing the bulls eye pattern a bit more clearly.


Contrast enhanced f/16 photo showing the pattern is very different than dust on the sensor. Lens rentals, 2015


All of the cameras we received had early serial numbers, and there is not going to be a direct serial number correlation with the problem. For example, we had 7 cameras in the SN 0220310007X range. Cameras with the last digit of 2 and 4 were affected, but 3 and 6 were not. That’s not surprising, really, since sensors would be manufactured somewhere else and then placed into the camera during assembly.

I’ve talked to people at Canon about this issue and they are aggressively looking into it. It will take some time for them to figure out what the issue is, where it occurred, and what cameras might be affected. They’re actively looking into the situation. They are NOT telling me, as some manufacturers do, that there is no problem.

My guess, and it’s just a guess, is that a bad batch of sensors were made, quality control missed this, and they got put into cameras. How big is a batch? I have no clue. Maybe it’s just a few hundred and we happened to get a lot (all of the cameras we’ve received have been pretty close in serial number). Maybe it’s thousands. Time will tell and I’m comfortable the problem is being addressed.

Oh, and for those of you who want to bash Canon quality control over this, well it’s appropriate, I won’t stand in your way. But I can’t because when I looked at these cameras myself the first time, I missed two of the ones with bad sensors. Like I mentioned earlier, direct light through a sensor loupe didn’t reveal it nearly as well as an angled spot light did. It’s possible the inspection of the sensors after assembly is done using a direct light, or some other automated equipment that isn’t capable of seeing this.

So I’m not throwing any stones out of my glass house. And having dealt with many manufacturers concerning many issues over the years, I’m just pleased that this issue is being taken seriously and investigated immediately. That’s not always the case.

In the meantime, check your new T6 when you get it, return it if you need to.

Roger Cicala and Aaron Closz

April, 2015


Addendum: I originally speculated that the problem might be in the adhesives used between layers of glass in the sensor stack. Several people, at least one of whom is an engineer in the industry, have emailed to tell me it appears much more likely this is a defect in the sputtering process used to coat the glass in the stack. Assuming this is the case, the problem would be visible immediately, it’s not something that would show up later after originally appearing normal.



Author: Roger Cicala

I’m Roger and I am the founder of Hailed as one of the optic nerds here, I enjoy shooting collimated light through 30X microscope objectives in my spare time. When I do take real pictures I like using something different: a Medium format, or Pentax K1, or a Sony RX1R.

Posted in New Items
  • Leonid

    I have a problem with my Canon 760d. I have bought a camera in Hong Kong in June 2015. Later, when I discovered that problem (dots on the sensor), I called to a dealer in Hong Kong. They advised me to contact with a local service center (now I’m in Ukraine). I have send my camera to the official Canon service center. They assured me that the problem will be solved (recall or sensor replacement) but now it is more then 7 monthes of waiting. I have made some requests already here but still – no responce! I am shocked with the Canon service!

  • Roger Cicala

    Chris, it is under the top layer of glass, but I can’t tell specifically which layer. I have been told by several people that this resulted from a defective sputtering of the glass during manufacturing and is not something that would develop over time. It either is or is not.

  • Roger,

    You describe this phenomenon as being under the top layer of glass. Can you elaborate on this a little? Is it on the LPS 1 or 2? I will be modifying one for Astro use, and removing both of these block layers to open up the spectrum for HA sensitivity. There is some conjecture out there that if you have a unit that is not currently affected, that this problem could develop over time. Depending on where this problem is situate on the sensor, it may be a factor for my situation. Of course, I will be voiding the warranty so it is particularly interesting to me. Thanks for all the work you do!

  • bob buckley

    Interesting Situation… I have a 3 or 4 year old 1Ds MK3.and at about 10,000 shots I noticed very similar spots through the upper right 1/4 of my sensor. I’ve had CPS Factory Service clean it 3 times – but there-after. every time I shoot the right conditions (like F-11 on a blue sky)the exact same spots are there. I advised Canon of this on my service orders 2 time asking if there’s something on my sensor… and have yet to get any response. Wondering if????

  • Dave M
  • My guess would be that the problem developed after QA check. It is hard to believe something like that would escape an even cursory look. I’d guess there is something wrong in the glueing of the filter stack, maybe a contaminated adhesive, maybe applied too thin/thick. Tiny bubbles of air expanding when the surrounding air pressure dropped during airplane shipment?

  • Ferrij Lumoring

    I’m surprised reading this news.
    I remembered, last month (5th April 2015) I noticed similar marks in my photo taken using Nikon D5300 with 18-300mm lens, into the dark blue afternoon sky, with f=16, ISO=200, 20 seconds.
    It shows around 11 (visible after enhancement) darker dots in that photo.
    Can somebody confirmed this is the same problem ?
    My Photo can be seen in this URL.

Follow on Feedly