Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and our Privacy Policy.
OK
Index  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Guest
New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Register to forums    Log in

 
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 06 May 2013 (Monday) 08:07
Search threadPrev/next
sponsored links
(this ad will go away when you log in as a registered member)

7D sensor issue at high ISO

 
sporadic
Senior Member
Avatar
559 posts
Gallery: 55 photos
Likes: 140
Joined May 2008
Location: Charleston, SC
     
May 06, 2013 08:07 |  #1

I was at the local aquarium yesterday taking a few shots and noticed this issue in post. I only noticed the problem in my ISO 3200+ photos. About 3/8 across the frame from the left, there is a vertical line of pixels which aren't exposing properly. The issue is more prevalent in the lower end of the spectrum / underexposed areas and can been seen best above the eagle's head on the tree. This was shot was at ISO3200 in RAW and processed in LR. The camera was purchased from Adorama back in October 2009. Any guesstimates on what Canon would charge me to fix this or what actions I should take?
thanks,
-shelby

IMAGE: http://farm9.staticflickr.com/8543/8714246840_3a81fed7a5_b.jpg

Fuji X-T1 | X-T2 | 35/1.4 | 10-24 | 18-55 | 55-200 | 50-140 | Rokinon 8/2.8II Fisheye | Rokinon 12/2
7D | 300/4 L IS

  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)
aliengin
Goldmember
1,151 posts
Likes: 74
Joined Mar 2011
     
May 06, 2013 08:23 |  #2

Is this what they call banding issue? I am not sure but I think I read something like this before.


Ali Engin Photography (external link)

  
  LOG IN TO REPLY
sporadic
THREAD ­ STARTER
Senior Member
Avatar
559 posts
Gallery: 55 photos
Likes: 140
Joined May 2008
Location: Charleston, SC
     
May 06, 2013 08:32 |  #3

aliengin wrote in post #15902406 (external link)
Is this what they call banding issue? I am not sure but I think I read something like this before.

The banding issue I believe is repetitive vertical bands (when in landscape orientation) in the shaded areas. This is a 1 pixel wide line that stays in the same sensor location.


Fuji X-T1 | X-T2 | 35/1.4 | 10-24 | 18-55 | 55-200 | 50-140 | Rokinon 8/2.8II Fisheye | Rokinon 12/2
7D | 300/4 L IS

  
  LOG IN TO REPLY
MakisM1
Cream of the Crop
Avatar
5,445 posts
Gallery: 10 photos
Likes: 234
Joined Dec 2011
Location: Houston
     
May 06, 2013 08:33 |  #4

May I suggest you post a 100% crop of the photo? If you want to confirm whether it is a line of dead pixels... If you post a downsized photo (to 1024) you are averaging 4 pixel values.


Gerry
Canon 5D MkIII/Canon 60D/Canon EF-S 18-200/Canon EF 24-70L USM II/Canon EF 70-200L 2.8 USM II/Canon EF 50 f1.8 II/Σ 8-16/ 430 EXII
OS: Linux Ubuntu/PostProcessing: Darktable/Image Processing: GIMP

  
  LOG IN TO REPLY
TeamSpeed
01010100 01010011
Avatar
33,383 posts
Gallery: 79 photos
Best ofs: 2
Likes: 3622
Joined May 2002
Location: Northern Indiana
     
May 06, 2013 08:36 |  #5

If you have a row of pixels out, you should see this at all ISOs, and I would think it would be repeatable. Definitely do a 100% crop and post it up though. Have you tried other CF cards?


Past Equipment | My Gallery (external link)

  
  LOG IN TO REPLY
sporadic
THREAD ­ STARTER
Senior Member
Avatar
559 posts
Gallery: 55 photos
Likes: 140
Joined May 2008
Location: Charleston, SC
     
May 06, 2013 08:47 |  #6

I don't have access to the original right now, but will get a 100% crop up tonight when I get home. I'm pretty sure it was 1 pixel wide last night when I processed it though. Actually, this is a newer CF card (around 500 shots so far) but I've only noticed it on ISO3200+ photos. I don't usually go past 1600, but will check my archives tonight to see if I can find evidence from older CF cards and firmware.


Fuji X-T1 | X-T2 | 35/1.4 | 10-24 | 18-55 | 55-200 | 50-140 | Rokinon 8/2.8II Fisheye | Rokinon 12/2
7D | 300/4 L IS

  
  LOG IN TO REPLY
sporadic
THREAD ­ STARTER
Senior Member
Avatar
559 posts
Gallery: 55 photos
Likes: 140
Joined May 2008
Location: Charleston, SC
     
May 06, 2013 08:57 |  #7

Here's a higher resolution one on Flickr (external link), however Facebook has already done it damage to it as I pulled it from my page. Will get a full res crop up tonight. Thanks!


Fuji X-T1 | X-T2 | 35/1.4 | 10-24 | 18-55 | 55-200 | 50-140 | Rokinon 8/2.8II Fisheye | Rokinon 12/2
7D | 300/4 L IS

  
  LOG IN TO REPLY
MakisM1
Cream of the Crop
Avatar
5,445 posts
Gallery: 10 photos
Likes: 234
Joined Dec 2011
Location: Houston
     
May 06, 2013 08:58 |  #8

You might wish to take a light photo and a dark one (cap on).


Gerry
Canon 5D MkIII/Canon 60D/Canon EF-S 18-200/Canon EF 24-70L USM II/Canon EF 70-200L 2.8 USM II/Canon EF 50 f1.8 II/Σ 8-16/ 430 EXII
OS: Linux Ubuntu/PostProcessing: Darktable/Image Processing: GIMP

  
  LOG IN TO REPLY
sporadic
THREAD ­ STARTER
Senior Member
Avatar
559 posts
Gallery: 55 photos
Likes: 140
Joined May 2008
Location: Charleston, SC
     
May 06, 2013 17:39 |  #9

Here are two of the eagle. No processing, just cropped 100% and coversion to jpg. Will try other tests later this evening when I get time.

IMAGE: http://farm8.staticflickr.com/7444/8716028708_5414f98e9c_o.jpg

IMAGE: http://farm8.staticflickr.com/7458/8714909155_336fcec243_o.jpg

Fuji X-T1 | X-T2 | 35/1.4 | 10-24 | 18-55 | 55-200 | 50-140 | Rokinon 8/2.8II Fisheye | Rokinon 12/2
7D | 300/4 L IS

  
  LOG IN TO REPLY
CyberDyneSystems
Admin (type T-2000)
Avatar
48,405 posts
Gallery: 84 photos
Likes: 4507
Joined Apr 2003
Location: Rhode Island USA
     
May 06, 2013 17:46 |  #10

That's really weird that it is invisible or non existent in the white feathers.

This is in more than one photo?


GEAR LIST
CDS' HOT LINKS
Jake Hegnauer Photography (external link)

  
  LOG IN TO REPLY
jwcdds
Cream of the Crop
Avatar
14,589 posts
Gallery: 1625 photos
Best ofs: 5
Likes: 4375
Joined Aug 2004
Location: Santa Monica, CA
     
May 06, 2013 18:38 |  #11

Hehe.. I've seen that before.

Your sensor has gone bad. My 1st copy of the 7D was just like this after 2 weeks of usage, when I bought it in 2009. It's as if a row of pixels had died or got stuck.

Adorama send me a replacement. But this is a sensor issue, unfortunately.


Julian
Gear/Feedbacks | SmugMug (external link) | Flickr (external link) | Blog (external link) | Instagram (external link) | YouTube (external link)
My Reviews | "The Mighty One" (external link) | "EF 85mm f/1.4 L IS Review" (external link)
Founding member and President of the BOGUS Photo Club (Blatantly-Over-Geared & Under-Skilled)

  
  LOG IN TO REPLY
sporadic
THREAD ­ STARTER
Senior Member
Avatar
559 posts
Gallery: 55 photos
Likes: 140
Joined May 2008
Location: Charleston, SC
     
May 06, 2013 19:11 |  #12

I just went back through my archives and it looks like it started at ISO6400 back in 2010.... ugh. I would've normally deleted these but good thing for being lazy! I could only find two photos from that year which had it at 6400 and none at 3200. Here's the best example I could find. Same location and very pronounced red. First is processed with the 2003 settings in LR, 2nd with 2012 settings.

IMAGE: http://farm8.staticflickr.com/7408/8715108103_7c64fb9352_b.jpg
IMAGE LINK: http://www.flickr.com …3/sizes/l/in/ph​otostream/  (external link)

IMAGE: http://farm8.staticflickr.com/7307/8715107803_33ea2ffc80_b.jpg
IMAGE LINK: http://www.flickr.com …3/sizes/l/in/ph​otostream/  (external link)

Fuji X-T1 | X-T2 | 35/1.4 | 10-24 | 18-55 | 55-200 | 50-140 | Rokinon 8/2.8II Fisheye | Rokinon 12/2
7D | 300/4 L IS

  
  LOG IN TO REPLY
sporadic
THREAD ­ STARTER
Senior Member
Avatar
559 posts
Gallery: 55 photos
Likes: 140
Joined May 2008
Location: Charleston, SC
     
May 06, 2013 19:18 |  #13

Just checked my 2012 photos as well. Highest ISO that year was 3200 with 100 photos, all of which are properly exposed and don't exhibit the issue. Seems constrained to underexposed areas of the photo and only at high ISO 3200+. Not a single hint of issues in any of my ISO1600 shots, even in the underexposed areas. I'll try some cap tests when I get a chance. Thanks for the feedback.


Fuji X-T1 | X-T2 | 35/1.4 | 10-24 | 18-55 | 55-200 | 50-140 | Rokinon 8/2.8II Fisheye | Rokinon 12/2
7D | 300/4 L IS

  
  LOG IN TO REPLY
MakisM1
Cream of the Crop
Avatar
5,445 posts
Gallery: 10 photos
Likes: 234
Joined Dec 2011
Location: Houston
     
May 06, 2013 19:31 |  #14

Normally you would see either dead pixels (black) or stuck pixels (bright). I guess there is no reason why they wouldn't get 'stuck' in an intermediate value and 'wake up' above a certain threshold...

Just thinking aloud...


Gerry
Canon 5D MkIII/Canon 60D/Canon EF-S 18-200/Canon EF 24-70L USM II/Canon EF 70-200L 2.8 USM II/Canon EF 50 f1.8 II/Σ 8-16/ 430 EXII
OS: Linux Ubuntu/PostProcessing: Darktable/Image Processing: GIMP

  
  LOG IN TO REPLY
sporadic
THREAD ­ STARTER
Senior Member
Avatar
559 posts
Gallery: 55 photos
Likes: 140
Joined May 2008
Location: Charleston, SC
     
May 06, 2013 19:53 |  #15

Just snapped a dozen dark cap shots at ISO3200 and 6400. Only showed on a few at 6400 this time. The rest you could barely tell. Below is the best example. Click for the full size orignal.

IMAGE: http://farm8.staticflickr.com/7315/8716320494_dddd132592_b.jpg
IMAGE LINK: http://www.flickr.com …4/sizes/l/in/ph​otostream/  (external link)

Fuji X-T1 | X-T2 | 35/1.4 | 10-24 | 18-55 | 55-200 | 50-140 | Rokinon 8/2.8II Fisheye | Rokinon 12/2
7D | 300/4 L IS

  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)

2,340 views & 0 likes for this thread
7D sensor issue at high ISO
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
AAA
x 1600
y 1600

Jump to forum...   •  Rules   •  Index   •  New posts   •  RTAT   •  'Best of'   •  Gallery   •  Gear   •  Reviews   •  Member list   •  Polls   •  Image rules   •  Search   •  Password reset

Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!


COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and to our privacy policy.
Privacy policy and cookie usage info.


POWERED BY AMASS forum software 2.1forum software
version 2.1 /
code and design
by Pekka Saarinen ©
for photography-on-the.net

Latest registered member is Guy Berridge
878 guests, 359 members online
Simultaneous users record so far is 6430, that happened on Dec 03, 2017

Photography-on-the.net Digital Photography Forums is the website for photographers and all who love great photos, camera and post processing techniques, gear talk, discussion and sharing. Professionals, hobbyists, newbies and those who don't even own a camera -- all are welcome regardless of skill, favourite brand, gear, gender or age. Registering and usage is free.