topic Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u in EOS DSLR & Mirrorless Cameras

I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are under

JSewell — Thu, 14 Aug 2014 14:49:48 GMT

I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are under exposed only. Can anyone help me figure out why it is doing this?

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

cale_kat — Thu, 14 Aug 2014 17:44:48 GMT

It isn't that uncommon to have banding in scenes which have high contrast content, difficult lighting (such as shooting into the sun), the degree of enlargement, and/or the shooting environment. The circlular shapes points to a lens derived effect.

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

JSewell — Thu, 14 Aug 2014 17:51:11 GMT

Thanks for the response. What about this example..? More subtle, but the effect is popping up seemingly randomly (commonly on underexposed photos) and on various lenses.

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

cale_kat — Thu, 14 Aug 2014 17:55:14 GMT

A damaged sensor, struck by a laser reflection that left a pattern? I'm grasping at straws. Sorry.

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

Mykolas — Sun, 17 Aug 2014 14:59:18 GMT

JSewell,

Does this happen when you shoot indoors out of the sunlight?
Do you have any filters attached to your lenses?

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

ebiggs1 — Sun, 17 Aug 2014 15:42:57 GMT

Stray light.

Are you using your lens' hood's? You should always use the hood unless you have a direct reason to not.

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

RobertTheFat — Sun, 17 Aug 2014 17:57:16 GMT

@JSewell wrote:
Thanks for the response. What about this example..? More subtle, but the effect is popping up seemingly randomly (commonly on underexposed photos) and on various lenses.

That picture is certainly not underexposed. It's not obvious that the phenomenon, whatever it is, is exposure-dependent. It could be that the lines, being fairly bright, are simply more prominent against a darker image.

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

cale_kat — Sun, 17 Aug 2014 19:45:17 GMT

@RobertTheFat wrote:
@JSewell wrote:
Thanks for the response. What about this example..? More subtle, but the effect is popping up seemingly randomly (commonly on underexposed photos) and on various lenses.
That picture is certainly not underexposed. It's not obvious that the phenomenon, whatever it is, is exposure-dependent. It could be that the lines, being fairly bright, are simply more prominent against a darker image.

I think the degree to which it is noticeable is exposure dependent but it appears, at least from the two samples shown, that it never goes away.

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

TCampbell — Sun, 17 Aug 2014 22:14:56 GMT

Everything on the sensor is going to be organized in rows and columns. You can get a bad pixel or a column of bad pixels... or perhaps even a block ... but not a curve. If you're seeing a curve then certainly there must be something else causing this.

The camera does have two internal filters in front of the sensor, but those are flat and would probably not be the source of a curved reflection.

If you are confident this happens with more than one lens, then I might remove the lens and use the menu system to put the camera into manual "sensor cleaning" mode. This really just causes the mirror to swing clear (to the roof the chamber) and also causes the shutter door to open and expose the sensor (although the sensor is actually powered down when in "cleaning" mode). This would allow you to visually check to make sure nothing is hanging in the light path.

I would normally suspect the problem is caused either by the lens or possibly by a filter mounted on the front of the lens (do you use any type of UV filter or other filter when this happens?) The lens itself is curved glass... but since a "filter" would be flat glass in front of the curved glass, a reflection off the curved glass can bounce back off the filter and into the camera. Many "ghosting" problems are caused by the use of filters (and these can be eliminated by removing the filter or reduced by using filters with anti-reflective coatings.)

Hopefully you can the solution -- but I would probably be looking at the optics as I suspect this is not related to the camera body.

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

ebiggs1 — Sun, 17 Aug 2014 23:06:01 GMT

"... but I would probably be looking at the optics ..."

As would I.

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

JSewell — Sun, 17 Aug 2014 23:14:25 GMT

1. I am almost always using a filter (in these examples I know was)

2. I never use filters attached to my lenses.

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

JSewell — Sun, 17 Aug 2014 23:18:23 GMT

Thanks for the response. I do manually clean my sensors and have never noticed anything visible. I shoot with two cameras (same bodies) and only one body is doing this. I have not noticed it an any indoor photos, even the underexposed ones. I am not using filters and I always use hoods.

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

ebiggs1 — Sun, 17 Aug 2014 23:21:32 GMT

Ditch the filters and all will be right.

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

JSewell — Sun, 17 Aug 2014 23:55:36 GMT

I am not using any filters.

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

RobertTheFat — Mon, 18 Aug 2014 01:32:53 GMT

@JSewell wrote:
I am not using any filters.

We're confused because earlier you said:

1. I am almost always using a filter (in these examples I know was)

2. I never use filters attached to my lenses.

In any case, are you fairly certain you've never exposed the camera to a strong magnetic field? Magnetic fields can have peculiar effects on electronic equipment.

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

JSewell — Mon, 18 Aug 2014 01:54:28 GMT

So sorry I typed that too fast. I meant to say :

1. I almost always use lens hoods

2. I never use filters.

I can't think if a time being exposed to a magnetic feild, but these cameras have been through a lot. Can you think of a real world example of a magnetic feild?

Also I guess the big question is would Canon would be able to repair something like this..?

Re: I am using a 5D Mark II and I am getting a series of three curved lines on the photos that are u

cale_kat — Mon, 18 Aug 2014 02:48:36 GMT

An example of where you might find a strong magnetic field could be an industrial setting where exposed electric motors are in operation. A medical area, in proximity to a MRI machine. (You would never be allowed close enough with your camera. BIG magnets!) Your kids have super magnet toys... Sound systems (speakers) sometimes have really big magnets.

It looks as though the damage has caused an incorrect response by the sensors in these zones. The "zones" are overly sensitive to light which is in evidence by their lighter shade than the surrounding areas.

So, the question is, what would cause a series of zones to be damaged in this way? I believe I mentioned before that strong reflections might generate enough energy to damage a camera sensor. Of course this is pure conjecture and you are probably going to send in your camera for service, barring any big developments. Here's a note about laser damage, http://www.laserist.org/camera-sensor-damage.htm