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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 04 Oct 2016 (Tuesday) 08:59
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Can a failing sensor cause yellow casts?

 
Colin ­ Glover
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Oct 04, 2016 08:59 |  #1

My stepson bought his 500D in 2012. He says he's done 500k clicks. I say he's done less. His last two home studio sessions have produced photos with a yellow cast. Not severe, and I think it's a lighting issue. He says correct WB was used. My take is that if sensor was failing it would be a severe cast. I can't post pics without his permission so ill just have to ask your opinion as to what could cause it.


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mfturner
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Oct 04, 2016 09:21 |  #2

Others with more experience may correct me, but as someone approaching 30 years in the semiconductor industry, I'd worry much more about mechanical shutter failure if he has even half those clicks with a camera that young. Have him try custom WB if it is available on that model, my money is on the lighting.




  
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gjl711
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Oct 04, 2016 09:26 |  #3

Need a sample pic to be able to guess with any confidence.


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mfturner
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Oct 04, 2016 10:01 |  #4

Another thought, I have a 60's era Zuiko 50f1.4 that gives a noticeable yellow cast, so he might try changing lenses to rule that out. Even my EF lenses have subtle color differences if you look for them. A quick picture outdoors with daylight WB might be interesting. Without seeing a sample, I'm just guessing. An electronic HW problem is hard to imagine, it might be stark, missing the whole blue channel, or have horizontal banding like with ML dual ISO. Does he use Magic Lantern?




  
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Colorblinded
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Oct 04, 2016 10:30 |  #5

We'd really need to see a sample image and the EXIF information.


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Oct 04, 2016 10:36 |  #6

Compact fluorescents typically give a strong yellow cast to pics.

Take some shots outside. :-)


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Colin ­ Glover
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Oct 04, 2016 11:51 as a reply to  @ mfturner's post |  #7

James doesn't use ML. I agree if it was HW issue then it would be stark. My 70D is in for repair at the moment and is stark with banding. I'll try and post FB page link but privacy settings might not allow.


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Colin ­ Glover
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Oct 04, 2016 12:04 |  #8

https://m.facebook.com …lse%26ftid%3Du_​o_16&mdf=1 (external link) though be aware it might not be available due to privacy settings. When I clicked it went to my profile.


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tzalman
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Oct 04, 2016 16:49 |  #9

A uniform yellow cast with its origin in the sensor would mean the uniform failure of every fourth sensel - those with the blue microfilters - or a simultaneous color degradation in all the blue filters 3,750,000 in number. Of course it is not unlikely that the electrons they have generated have to be integrated into a fluctuating blue channel at some point in their journey to the ADC, an opportunity for mishap, or the algorithms for the assignment of blue channel digital values in the ADC itself may have changed - but I would consider that a last ditch line of inquiry. I would look into the studio illumination first and the WB second.


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Mathmans
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Oct 07, 2016 04:31 as a reply to  @ tzalman's post |  #10

If he wants help (your stepson), he will share a photo with all exif data on it.
I just don't get it - people wants help but don't want to show pictures.


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Bassat
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Oct 07, 2016 04:38 |  #11

I agree that it is NOT a sensor problem. There is very little likelihood of 15 million of anything going bad all at once. This is a WB issue. By 'correct' does he mean he selected the right WB Icon? They are mostly a waste of time. AWB is good for daytime sunshine. FLASH is good for flash. The rest are a complete waste of time. If AWB or FLASH aren't what you need, use CUSTOM WB. It takes 2 seconds, less with experience, and it is reliable. If using CUSTOM, shoot raw. You'll love the latitude.




  
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Colin ­ Glover
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Oct 08, 2016 11:12 |  #12

Agreed. I shoot raw myself, James shoots JPeg. I fully agree with everyone. It's just James thinks it's not. Thanks for replying.


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tzalman
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Oct 08, 2016 15:17 |  #13

Sounds like James is trying to justify getting a new camera.


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Colin ­ Glover
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Oct 11, 2016 11:58 |  #14

Got it in one. His wife, however, with an 18 mth old son has better uses for the cash. Sadly, she is so misguided.


Canon EOS 70D, Canon EOS 600D, EF-S 18-55 ii, EF 55-200 USM ii, EF-S 75-300 iii, Tamron 28-80, Sigma 70-210. Pentax 50mm, Pentax 135mm, EF-S 55-250, Raynox Macro adapter, Neewer filters (CPL, UV, FLD & ND4), Fuji HS20 EXR (30X zoom ) & cable release, Yongnuo 560 iii & Luxon 9800A manual flashguns for the Fuji, Hama Star 63 tripod, Hongdek RC-6 remote control, Velbon DF 40 www.point-n-shoot.co.uk website.

  
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Oct 11, 2016 19:24 |  #15

Colin Glover wrote in post #18154175 (external link)
Got it in one. His wife, however, with an 18 mth old son has better uses for the cash. Sadly, she is so misguided.

Guns and cameras, the correct number to own is N+1, where N= Number already owned. There is no such thing as too much ammunition/memory cards/film! Oh it probably applies to motorbikes too, but I can't ride those anymore :(.

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Can a failing sensor cause yellow casts?
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