7D vertical banding - a "regular fault"?

Panopeeper · 29th of September 2009 (Tue)

A very few copies of the 5D2 exhibited a hardware fault (unbalanced A/D channels). I saw and analyzed raw files of four of such cameras; all have been repaired by Canon in the meantime.

See the thread http://photography-on-the.net/forum/...d.php?t=674155

It appears now, that this kind of fault is present in the 7Ds as well. There are not many raw files around yet, but most of those I analyzed exhibit this fault to different degree; some are probably negligable, while others look worse.

The fault is visible in low-ISO raw images, only in the very shadows. As usual, some posters will say that a Canon camera is not supposed to be defamed by underexposed shots. Those, who believe that the 7D should reproduce details in the deep shadows as well, may be more interested on this issue.

The fault can be shown the easiest on ISO 100 black frame shots. A black frame shot looks normally pretty boring. Example: from the 50D, ISO 200, first the composite color, then the single raw channels (only one of the greens):

Now, let's see the black frame of the 7D, with ISO 100:

The raw files can be analyzed by Rawnalyze, see http://www.cryptobola.com/PhotoBola/Rawnalyze.htm
If someone uploads such raw file(s), I can do that too. It would be interesting to find out, how much this fault affects the converted images. Unfortunately there are not many samples out there with low ISO and very dark patches.

rx7speed · 29th of September 2009 (Tue)

just curious though and while it might not be relevent but still figured I would ak. is it just me or does the 50d show some lines as well that while not any were near as pronounced or frequent they do seem to be there.

AdamLewis · 29th of September 2009 (Tue)

This is why I love POTN

nicksan · 29th of September 2009 (Tue)

I've got a version of that red channel pic hanging on my wall.
What a coincidence!

Agamemnon · 29th of September 2009 (Tue)

Am I supposed to see a vase? Or two faces?

I don't think I'm crossing my eyes enough...

nicksan · 29th of September 2009 (Tue)

Quote:

Originally Posted by Agamemnon

Am I supposed to see a vase? Or two faces?

I don't think I'm crossing my eyes enough...

I think I see a bird shot at ISO1600.

Photon Phil · 29th of September 2009 (Tue)

This is NOT good for the impeccable reputation of the 7D on POTN.

grphx · 29th of September 2009 (Tue)

It's a schooner.

20DNewbie · 29th of September 2009 (Tue)

Quote:

Originally Posted by Agamemnon

Am I supposed to see a vase? Or two faces?

I don't think I'm crossing my eyes enough...

Agamemnon · 29th of September 2009 (Tue)

Quote:

Originally Posted by nicksan

I think I see a bird shot at ISO1600.

Well! So much for the 7D as a good birding camera!

It'll have to be relegated to the likes of the 50D, and other maligned cameras!

Wait...I think I shoot birds with a 50D. Poop!

Bill Roberts · 29th of September 2009 (Tue)

That reminds me of a fault I had with a 1DIIN a couple of years back LINK.

Interesting...

cheers

stsva · 29th of September 2009 (Tue)

I think those are the 3D shots someone was hoping for in another thread - just look at them long enough and a dinosaur pops out.

Rabies · 29th of September 2009 (Tue)

Quote:

Originally Posted by grphx

It's a schooner.

No stupid, it's a sailboat.

OK, just for giggles, I'll shoot the inside of a lens cap tonight (wouldn't be the first time

) and have a look at it to see if the problem is repeatable on a different 7D body.

samueli · 29th of September 2009 (Tue)

Quote:

Originally Posted by AdamLewis

This is why I love POTN

+1

Also, this gives my first reason not to upgrade to the 7D. I take quite a few solid black shots for various assignments, that this is a deal breaker.

grphx · 29th of September 2009 (Tue)

None of my pictures look anything like that.

29th of September 2009 (Tue)	#1
Panopeeper Member Join Date: May 2008 Posts: 774 IMAGE EDITING OK	7D vertical banding - a "regular fault"? A very few copies of the 5D2 exhibited a hardware fault (unbalanced A/D channels). I saw and analyzed raw files of four of such cameras; all have been repaired by Canon in the meantime. See the thread http://photography-on-the.net/forum/...d.php?t=674155 It appears now, that this kind of fault is present in the 7Ds as well. There are not many raw files around yet, but most of those I analyzed exhibit this fault to different degree; some are probably negligable, while others look worse. The fault is visible in low-ISO raw images, only in the very shadows. As usual, some posters will say that a Canon camera is not supposed to be defamed by underexposed shots. Those, who believe that the 7D should reproduce details in the deep shadows as well, may be more interested on this issue. The fault can be shown the easiest on ISO 100 black frame shots. A black frame shot looks normally pretty boring. Example: from the 50D, ISO 200, first the composite color, then the single raw channels (only one of the greens): Now, let's see the black frame of the 7D, with ISO 100: The raw files can be analyzed by Rawnalyze, see http://www.cryptobola.com/PhotoBola/Rawnalyze.htm If someone uploads such raw file(s), I can do that too. It would be interesting to find out, how much this fault affects the converted images. Unfortunately there are not many samples out there with low ISO and very dark patches. __________________ Gabor

29th of September 2009 (Tue)	#2
rx7speed Member Join Date: Jun 2008 Location: caldwell, idaho Posts: 663 IMAGE EDITING OK	Re: 7D vertical banding - a "regular fault"? just curious though and while it might not be relevent but still figured I would ak. is it just me or does the 50d show some lines as well that while not any were near as pronounced or frequent they do seem to be there. __________________ digital: 7d, XSI 18-55, 55-250, 70-200L 2.8 IS MKII, 17-55 2.8 IS sunpak 383, sigma 530 DG super, and a china studioish strobe Film: A1 - 70-210 f/4 black and white only. www.flickr.com/rx7speed

29th of September 2009 (Tue)	#3
AdamLewis Goldmember Join Date: Oct 2005 Location: Louisville, KY Posts: 4,031	Re: 7D vertical banding - a "regular fault"? This is why I love POTN __________________

29th of September 2009 (Tue)	#4
nicksan Man I Like to Fart Join Date: Oct 2006 Location: Friggin' NYC Posts: 16,081 IMAGE EDITING OK	Re: 7D vertical banding - a "regular fault"? I've got a version of that red channel pic hanging on my wall. What a coincidence! __________________ NYC Wedding Photographer \| Blog \| facebook \| Zenfolio \| Flickr \| Gear List

29th of September 2009 (Tue)	#5
Agamemnon Member Join Date: Sep 2006 Location: Ottawa, ON, Canada Posts: 262 IMAGE EDITING OK	Re: 7D vertical banding - a "regular fault"? Am I supposed to see a vase? Or two faces? I don't think I'm crossing my eyes enough... __________________ Ryan Website: http://www.ryanlindseyphoto.com Gear: My Gear

29th of September 2009 (Tue)	#7
Photon Phil Senior Member Join Date: Jan 2006 Location: Capturing Photons in Wisconsin Posts: 1,540 IMAGE EDITING OK	Re: 7D vertical banding - a "regular fault"? This is NOT good for the impeccable reputation of the 7D on POTN. __________________ Bodies: 1D Mark I / 40D / 20D / Pentax K100D / Nikon D70 (18-55VR, 55-200) Primes: Canon 35 f2 --Lights: AB800 / AB400 & Cybersyncs-- Zooms: Canon 17-85IS / Tamron 28-75 f2.8 / Canon 70-210 f4 / Sigma 18-200 OS Classics: Pentax Super Takumars 50 f1.4 / Pentax SMC 50 f1.4,f1.7,f2.0 / Yashinon 50 f1.4,f1.7

29th of September 2009 (Tue)	#8
grphx Member Join Date: Oct 2006 Posts: 605 IMAGE EDITING OK	Re: 7D vertical banding - a "regular fault"? It's a schooner. __________________ Canon 50D, Canon Digital Rebel XT, Canon 18-55mm kit lens, Sigma 10-20mm Canon 50mm lens Canon 430ex Canon 70-200mm F/4 L Canon 28-135 IS USM

29th of September 2009 (Tue)	#11
Bill Roberts revolting peasant Join Date: Apr 2006 Location: Barnoldswick - North West UK Posts: 2,035 IMAGE EDITING OK	Re: 7D vertical banding - a "regular fault"? That reminds me of a fault I had with a 1DIIN a couple of years back LINK. Interesting... cheers __________________ BiLL

29th of September 2009 (Tue)	#12
stsva Goldmember Join Date: Mar 2009 Location: Northern Virginia Posts: 2,571 IMAGE EDITING OK	Re: 7D vertical banding - a "regular fault"? I think those are the 3D shots someone was hoping for in another thread - just look at them long enough and a dinosaur pops out. __________________ Some Canon stuff with a pinch of Sigma. http://www.pbase.com/stsva/profile Member of the GIYF™ Club and HAMSTTR© Breeders Club http://photography-on-the.net/forum/...hlight=hamsttr Join today!

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