topic Re: 6D and light leak? in EOS DSLR & Mirrorless Cameras

6D and light leak?

Peter — Sun, 10 Mar 2013 05:13:29 GMT

I took some pictures at ISO >25600 and found a lightspot down in the right corner. I am wondering why just one corner? It is not like the 5DIII:s light leak, because this will appeare in a dark room and always in the same corner. Is it warmer in that corner and results in more noise?

http://imageshack.us/photo/my-images/233/img0605rr.jpg/

It is not a real problem, but I am curious.

Re: 6D and light leak?

Mykolas — Wed, 13 Mar 2013 10:29:12 GMT

Hi Peter,

I would like to ask a few questions about this if you do not mind.

Was this shot taken with the lens cap on?
Was this shot taken with the camera on a tripod?
Were you looking through the viewfinder at the time?
Was the viewfinder completely covered when you took this shot?

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Re: 6D and light leak?

Peter — Wed, 13 Mar 2013 11:00:50 GMT

Was this shot taken with the lens cap on? Yes, but even without there will be a light leak.
Was this shot taken with the camera on a tripod? No
Were you looking through the viewfinder at the time? Yes
Was the viewfinder completely covered when you took this shot? No.

I am just wondering why just one corner will light up. I will try some new shots.

Re: 6D and light leak?

Peter — Wed, 13 Mar 2013 11:29:41 GMT

Okey, here we go:

Was this shot taken with the lens cap on? Yes, in a dark room
Was this shot taken with the camera on a tripod? No
Were you looking through the viewfinder at the time? No, but live view was not used.
Was the viewfinder completely covered when you took this shot? yes.

Raw image you find here: http://kameratrollet.se/allt/6d.CR2

I tried 4 seconds at different ISO. Only at H1 and H2 the light in the right corner appears. I suppose the sensor is warmer in that corner than in other places, so my question is why?

I don´t think I will use H1 and H2 at all, but I am curious.

http://kameratrollet.se/allt/6d2.CR2 shows a picture that is taken at H2 and 1/800 seconds. the right corner is lighted up.

Noise reduction for long expsure will remove the lighted corner, but only for pictures with longer exposure than 1-4 seconds.

Re: 6D and light leak?

hsbn — Mon, 12 Aug 2013 16:37:40 GMT

I did some night shot over the weekend and experienced the same problem with ISO6400 and 30s exposure also.

Re: 6D and light leak?

Peter — Mon, 10 Feb 2014 19:15:39 GMT

Then I assume many more of 6D have the same light leak.

Re: 6D and light leak?

TCampbell — Mon, 10 Feb 2014 20:21:14 GMT

It may not be a "leak" at all.

When you crank the ISO really high, you get a lot of noise in the image -- you already knew that. But there is a relationship between the physical temperature of the chip and the amount of "noise". You also notice the pattern noise (and that's normal -- all sensors do it). If you were to chill the camera by being outside with it an hour or so, then repeat the same test and compare the images, you'd notice that the images taken wtih a very cold sensor have noticeably less noise than the images taken with a warm sensor. The opposite is also true -- if the camera is used in very hot temperatures then it will have a lot more noise in the image.

I'm wondering if your sensor wasn't simply "physically" warmer in that corner, making it have more noise.

Re: 6D and light leak?

Peter — Tue, 11 Feb 2014 09:18:00 GMT

Maybe it is. The only question I have left is why we haven't seen the same thing from other models from Canon.

Re: 6D and light leak?

ddyourself — Tue, 11 Feb 2014 14:55:36 GMT

The only explanation is Canon rushed to build a cheap full frame to compete with D600. They squeezed every corner and saved every penny on quality control.