topic Re: Rebel T6I Sky Banding? in EOS DSLR & Mirrorless Cameras

Rebel T6I Sky Banding?

ElectricMuppet — Fri, 10 Feb 2017 21:52:15 GMT

Hello!

I bought a Canon Rebel T6I a few months ago and I just took it outside for a spin. I've noticed in all of my photos outside I have these weird bars. I have no idea why. I figured maybe it could've been the weather since it's been horrendously cold lately, but today I went out to test if it was the bad weather and took a photograph instantly and it's still there. I came here hoping that people who know photography would be able to tell me what this is and what may be causing it? It seems to only happen in they sky of my photos. I've taken indoor photos and they don't seem to be appearent. I have edited these in Lightroom and cropped them in Photoshop so they're more visable. The second image I edited it heavly to show it incase if its not all the visible in the first image. The second image it was snowing when I took it. Sorry for the black mess in it. is it noise banding? I've been feverishly looking online for information but alas I have not been able to find anything that seems close to my issue.

Sorry if something like this has been asked before. I am truely desperate to find out what's going on. I hope its something that I can prevent from happening and not my camera.

I shot these with a Rokinon 14 mm lens if that helps. Thank you's any information would be truley grateful.

Re: Rebel T6I Sky Banding?

kvbarkley — Sat, 11 Feb 2017 00:26:24 GMT

I don't see banding - or any other issues in the top one.

The lower one seems to have some sensor dust and those wierd reflections/artifacts but no banding.

What JPEG setting are you using?

Re: Rebel T6I Sky Banding?

ElectricMuppet — Sat, 11 Feb 2017 00:51:34 GMT

Thank you for the reply kvbarkley!

I am shooting in RAW. Those black lines in the photo are infact snow falling and not dust on my sensor.
I highlighted the falling snow in red. It's the blue box im worried about. Those lines are in all my photos in the daylight but not in my photos at night or indoors. I've used a curves layer to hopefully help you's see the lines better. It's hard to see it in raw until its edited.

I don't know whats causing it. I just went outside and took an image of the snowy street under a street light and everything seems fine in it during night time.

Re: Rebel T6I Sky Banding?

Waddizzle — Sat, 11 Feb 2017 01:05:14 GMT

If you are shooting RAW, then turn off all of the noise reduction settings. You should have a high ISO noise reduction. There should be a long exposure noise reduction. Disable the any auto lighting optimizer. All of those settings, and more, can be realized in post processing, so it is not necessary for the camera to implement them.

Re: Rebel T6I Sky Banding?

Peter — Sat, 11 Feb 2017 09:58:44 GMT

I see 14 lines (7 pairs) in the first one and with exactly same distance to each other. I would say that is is time to send the camera to Canon for a repair if Canon is able to fix it with interpolation or mapping out the lines. It is a known issue with Canon M3, 750D and 760D. If you unmount the lens and take a look at the sensor, you will see 7 lines.

If you check the lines, you will see that you will not have 6 pairs or 8 pairs. You will always get 7 pairs.This is caused due to the Hybrid CMOS AF III system. You can search at google pictures with the keywords Hybrid_CMOS_AF_Generations

I think that if you use Canon Digital Photo Professional 4 the software will mask the problem a little bit.

Re: Rebel T6I Sky Banding?

ElectricMuppet — Sat, 11 Feb 2017 12:47:48 GMT

Thank you Peter for the reply!

That's unfortunetly something I did not want to hear. I just bought the camera two months ago, December 16th to be exact. Kind of lame that I have to send it into Canon already. especially when its not something caused by me haha. is it going to be more money out of my pocket to get my camera fixed? I don't even know where to start to begin such a proccess. I'm gonna try Waddizles advice later on today and post results in sheer hope a miracle happens.

Re: Rebel T6I Sky Banding?

Peter — Sat, 11 Feb 2017 13:50:54 GMT

@ElectricMuppet wrote:
Thank you Peter for the reply!

That's unfortunetly something I did not want to hear. I just bought the camera two months ago, December 16th to be exact. Kind of lame that I have to send it into Canon already. especially when its not something caused by me haha. is it going to be more money out of my pocket to get my camera fixed? I don't even know where to start to begin such a proccess. I'm gonna try Waddizles advice later on today and post results in sheer hope a miracle happens.

Warranty, and shouldn´t cost you anything if Canon is able to map out the lines. Call Canon in your country and ask. Also try Canon Photo Professional 4 if you shoot in raw.

Anyway, check your PM because I sent you a message there.

Re: Rebel T6I Sky Banding?

StanNH — Sat, 11 Feb 2017 13:57:47 GMT

I bought my T6S in December also, and it has no trace of banding even with heavy cropping. I was not aware of a sensor defect.

If you can't resolve the issue with the in camera settings, my suggestion would be to call Canon support and arrange for a warranty return and service. It will cost you nothing but the shipping.

Re: Rebel T6I Sky Banding?

ebiggs1 — Sat, 11 Feb 2017 14:18:12 GMT

Peter is correct except this isn't going to be something that can be "mapped out". You need to have Canon evaluate your camera as I think they will get you another one. This shouldn't, won't, cost you anything but time.

But before you send it in, buy a new high quality SD card and re-try. Get a name brand SD card never use off brand or cheap SD cards. They can do exactly what you are seeing.

Re: Rebel T6I Sky Banding?

Peter — Sat, 11 Feb 2017 14:30:53 GMT

@StanNH wrote:
I bought my T6S in December also, and it has no trace of banding even with heavy cropping. I was not aware of a sensor defect.

If you can't resolve the issue with the in camera settings, my suggestion would be to call Canon support and arrange for a warranty return and service. It will cost you nothing but the shipping.

A quote from Canon:

Canon is able to reproduce the stripes. The stripes will appear in those areas where the pixels for the AF are located. This is causing a lower density of image pixels in those areas. This not a lack of quality, since the effect will be seen only if heavy post-processing is applied. If applied PP is on a normal level, the effect will not be visible

Re: Rebel T6I Sky Banding?

StanNH — Sat, 11 Feb 2017 14:45:05 GMT

Peter, thanks for the sensor information. I apparently have not yet reached that threshold in my post processing ... even in what I think are fairly heavily processed pictures, I haven't seen that artifact. Is this only seen with AF? Are manual focus and single point focus also effected?

How many models use this same processor with the same potential for these artifacts?

Re: Rebel T6I Sky Banding?

Peter — Sat, 11 Feb 2017 14:50:28 GMT

@StanNH wrote:
Peter, thanks for the sensor information. I apparently have not yet reached that threshold in my post processing ... even in what I think are fairly heavily processed pictures, I haven't seen that artifact.

How many models use this same processor with the same potential for these artifacts?

What I know: 750D, 760D and M3. Other cameras use other pattern.

Re: Rebel T6I Sky Banding?

ElectricMuppet — Sat, 11 Feb 2017 15:15:46 GMT

ebiggs1 I am using a Sony Class 10 128 GB SD card in my camera. I'm afraid I do not have another SD card on me. I'd rather pay the 20 bucks or whatever it will cost for shipping and get them to look at the camera than buy another SD card to be safe.

To everyone else I'm gonna call Canon support on Monday and see what are my options. I'll keep yea's updated.

Re: Rebel T6I Sky Banding?

Peter — Sat, 11 Feb 2017 15:47:56 GMT

@ebiggs1 wrote:
Peter is correct except this isn't going to be something that can be "mapped out". You need to have Canon evaluate your camera as I think they will get you another one. This shouldn't, won't, cost you anything but time.

But before you send it in, buy a new high quality SD card and re-try. Get a name brand SD card never use off brand or cheap SD cards. They can do exactly what you are seeing.

The lines are visible for the eye. Just use a flash light and you will see them.

It also seems like it is possible to use dcraw in post to get the lines mapped out. It works with other cameras that use other pattern.

@ElectricMuppet wrote:

ebiggs1 I am using a Sony Class 10 128 GB SD card in my camera. I'm afraid I do not have another SD card on me. I'd rather pay the 20 bucks or whatever it will cost for shipping and get them to look at the camera than buy another SD card to be safe.

To everyone else I'm gonna call Canon support on Monday and see what are my options. I'll keep yea's updated.

Don´t forget to read the private message I sent you.

Re: Rebel T6I Sky Banding?

Peter — Sat, 11 Feb 2017 16:50:30 GMT

I got your raw file now. One thing I'm thinking about is your lens that your camera can't read some data from.

Canon makes raw files with wide apertures a little bit brighter, from f/2,8-f/0 I suppose. What I say is that a raw file is never 100% untouched.

Your lens tells the camera f/0. Do you own a Canon lens or can you borrow one and try? I ask because I downloaded raw files from M3, 750D and 760D and tried tonemapping them all to see if I found some issues. I think I could see two lines from the M3 but not from the others. Your raw file on the other hand was easy to see the lines.

Another person with the same problem (astro photo) didn't use a canon lens and also the aperture was f/0.

Re: Rebel T6I Sky Banding?

ElectricMuppet — Sat, 11 Feb 2017 16:50:05 GMT

A quote from Canon:

Canon is able to reproduce the stripes. The stripes will appear in those areas where the pixels for the AF are located. This is causing a lower density of image pixels in those areas. This not a lack of quality, since the effect will be seen only if heavy post-processing is applied. If applied PP is on a normal level, the effect will not be visible

Yea, it has to be something wrong with my sensor then because I can see it in my images without any post processing if i look hard enough.

Re: Rebel T6I Sky Banding?

ElectricMuppet — Sat, 11 Feb 2017 16:52:19 GMT

@Peter wrote:
I got your raw file now. One thing I'm thinking about is your lens that your camera can't read some data from.

Canon makes raw files with wide apertures a little bit brighter, from f/2,8-f/0 I suppose. What I say is that a raw file is never 100% untouched.

Your lens tells the camera f/0. Do you own a Canon lens or can you borrow one and try? I ask because I downloaded raw files from M3, 750D and 760D and tried tonemapping them all to see if I found some issues. I think I could see two lines from the M3 but not from the others. Your raw file on the other hand was easy to see the lines.

Another person with the same problem (astro photo) didn't use a canon lens and also the aperture was f/0.

I can go outside with my kit lens and take a photo of the sky if you need it. I also have a canon 1.8 50 mm lens. the nifty fifty one

Re: Rebel T6I Sky Banding?

Peter — Sat, 11 Feb 2017 16:56:42 GMT

@ElectricMuppet wrote:
@Peter wrote:
I got your raw file now. One thing I'm thinking about is your lens that your camera can't read some data from.

Canon makes raw files with wide apertures a little bit brighter, from f/2,8-f/0 I suppose. What I say is that a raw file is never 100% untouched.

Your lens tells the camera f/0. Do you own a Canon lens or can you borrow one and try? I ask because I downloaded raw files from M3, 750D and 760D and tried tonemapping them all to see if I found some issues. I think I could see two lines from the M3 but not from the others. Your raw file on the other hand was easy to see the lines.

Another person with the same problem (astro photo) didn't use a canon lens and also the aperture was f/0.
I can go outside with my kit lens and take a photo of the sky if you need it. I also have a canon 1.8 50 mm lens. the nifty fifty one

Please do so. Try different appertures and take a few of the sky with your Canon lenses and with your third part lens. I will be back in a couple of hours.

Re: Rebel T6I Sky Banding?

ElectricMuppet — Sat, 11 Feb 2017 16:59:45 GMT

Alright, I'll be about 10-20 minutes. I need to let my battery charge a bit. I'll post the processed photos here and send you the raw's via email again.

What I was shooting from was a Rokinon 14mm 2.8 UMC lens without an AE chip.

Re: Rebel T6I Sky Banding?

Peter — Sat, 11 Feb 2017 17:07:48 GMT

@ElectricMuppet wrote:
Alright, I'll be about 10-20 minutes. I need to let my battery charge a bit. I'll post the processed photos here and send you the raw's via email again.

What I was shooting from was a Rokinon 14mm 2.8 UMC lens without an AE chip.

Digital Photo Professional 4 didn't help either with your raw file.