5D MK I - different noise pattern on low ISO

I noticed on few of my images that they have somehow weird noise pattern, i never seen anything like this before, it appeared only on images with two ladies on picture.. it is like from ghost stories, ghost interfering my camera sensor... really odd.

Has anyone ever encountered something like this? I´am worried about camera sensor.


Thanks a lot!


Full image and crop :

Sorry, but I don't see anything.

I looked really closely and have no clue what you are referring to, unless of course those two ladies were not there when you pressed the shutter.
That would certainly be weird.

I can't see anything unusual either, it looks like a perfectly normal photo. What are we supposed to be seeing?

Time to calibrate you monitor OP

It was probably really hard to see on some monitors i tried myself to check this. Sorry.
i pushed the image from shadows to make noise pattern more visible.

I used ISO 100.

This is a different crop than the two ladies. I don't get how we are supposed to compare. I still don't see anything.

OK, I do see some (a lot) of color noise. That is from raising the exposure; it has nothing to do with ghosts, and it is in an irrelevant, underexposed part of the shot. What does shadow-boosted color noise have to do with the ladies?

Any digital photo will show noise if/when you lift the shadows enough. Jeez, underexpose in bright daylight and boost in post, you'll get lots of noise.

I know how color banding looks like, but this looks different .. All images here are actual crops from the same image.

raising the exposure only made the noise pattern more visible (i did it for demonstration purposes), but it is there even without any exposure changes. It is NOT present on other images i have from this day.

SAMPLE RAW FILES HERE :

http://temp.lukaskrasa​.com/no_colorbanding.C​R2 - same day, ISO 100, no issues with noise pattern in shadows even after exposure changes.

http://temp.lukaskrasa​.com/colorbanding.CR2 - ISO100, RAW file of image above, ugly noise pattern in shadows visible even without any exposure changes.


Thanks again, i know it´s like hunting the ghost, but it troubles me a lot.

Downloaded the cr2s. I'll have a look.

I had a look at the raw files. I see it now. It seems to affect the entire frame in the 'ladies' shot, light and dark areas alike. I see no evidence of it in the 'statue' shot, even in the darkest shadows. Sorry, but I have no idea what it is. Bad card? Corrupted on import? It would annoy me, too.

EDIT: FWIW, I played with the 'noise' in LR5.7. With the Luma NR shut off, I can take Color NR all the way to 100, and the color is gone, but the banding is still there. I have to add enough Luma NR to kill detail to get rid of the banding. Color NR @ 100 & Luma @ 90 kills the banding, and the rest of the photo. I've never seen anything like this.

2nd EDIT: I had a good look at the statue shot. If I boost the exposure 1 stop - nothing. 2 stops - the banding shows up in darker areas. 3 stops - banding just like the 'ladies' shot shows up. And it is NOT normal noise; it looks brushed on, just like the 'ladies' shot.

Just reporting. I have no idea what it means.

Thank you for taking your time.
I don´t see the same noise color banding in statue shot, the noise is apparent, but it doesn´t appear in such ugly patterns across the frame like the shot with ladies.

Have you thought about electrical noise, for example from a tram? This body is supposed to be prone to it.

I never saw electrical noise from trams affect my 5D. But we no longer have the old type with a pole that jumps away from the wire. Those used to cause problems with modems.

Thank you, it could be electrical noise, but no trams were near me or other similar object except lot of people, i was searching some other examples of other sensor issues and nothing was close... :/¨¨

The original 5D was somewhat vulnerable to electrical interference. As far as I remember using certain lenses in AI Servo would cause similar banding due to some electrical interference. Maybe something similar is going on, not necessarily from an AI Servo lens but from from somewhere in Prague.

Thank you, Gabe! Huge relief!

i googled myself and found some examples that even certain radio flash triggers could cause something like this.

I´am gonna test the camera intensively with AI Servo on all of my lenses.


Thank you again!