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Super Contributor
Posts: 140
Registered: ‎12-03-2016

Re: Rebel T6I Sky Banding?

[ Edited ]

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?

Reputable Contributor
Posts: 729
Registered: ‎11-14-2012

Re: Rebel T6I Sky Banding?

[ Edited ]

@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.

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M5, 7D, 6D, D30, 300D, 30D, 1000D IR, EOS DCS 3c, EOS D2000, 16-35/4L IS, 100/2,8 Macro, 70-200/2,8L IS II, 24-105/4L, 85/1,8, 50/1,4, 24/1,4L II, 300/2,8L IS, Helios 58/2

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Frequent Contributor
Posts: 27
Registered: ‎02-10-2017

Re: Rebel T6I Sky Banding?

[ Edited ]


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.

Reputable Contributor
Posts: 729
Registered: ‎11-14-2012

Re: Rebel T6I Sky Banding?

[ Edited ]

@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.

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My Swedish blog

M5, 7D, 6D, D30, 300D, 30D, 1000D IR, EOS DCS 3c, EOS D2000, 16-35/4L IS, 100/2,8 Macro, 70-200/2,8L IS II, 24-105/4L, 85/1,8, 50/1,4, 24/1,4L II, 300/2,8L IS, Helios 58/2

Darktable, RawTherapee, Photomatix, Luminance HDR, GIMP 2.10.6.
Reputable Contributor
Posts: 729
Registered: ‎11-14-2012

Re: Rebel T6I Sky Banding?

[ Edited ]

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.

---------------------------------------------------------
My Swedish blog

M5, 7D, 6D, D30, 300D, 30D, 1000D IR, EOS DCS 3c, EOS D2000, 16-35/4L IS, 100/2,8 Macro, 70-200/2,8L IS II, 24-105/4L, 85/1,8, 50/1,4, 24/1,4L II, 300/2,8L IS, Helios 58/2

Darktable, RawTherapee, Photomatix, Luminance HDR, GIMP 2.10.6.
Frequent Contributor
Posts: 27
Registered: ‎02-10-2017

Re: Rebel T6I Sky Banding?



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. 

IMG_2255.png

Frequent Contributor
Posts: 27
Registered: ‎02-10-2017

Re: Rebel T6I Sky Banding?


@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

Reputable Contributor
Posts: 729
Registered: ‎11-14-2012

Re: Rebel T6I Sky Banding?

[ Edited ]

@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.

---------------------------------------------------------
My Swedish blog

M5, 7D, 6D, D30, 300D, 30D, 1000D IR, EOS DCS 3c, EOS D2000, 16-35/4L IS, 100/2,8 Macro, 70-200/2,8L IS II, 24-105/4L, 85/1,8, 50/1,4, 24/1,4L II, 300/2,8L IS, Helios 58/2

Darktable, RawTherapee, Photomatix, Luminance HDR, GIMP 2.10.6.
Frequent Contributor
Posts: 27
Registered: ‎02-10-2017

Re: Rebel T6I Sky Banding?

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.

Reputable Contributor
Posts: 729
Registered: ‎11-14-2012

Re: Rebel T6I Sky Banding?


@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.

---------------------------------------------------------
My Swedish blog

M5, 7D, 6D, D30, 300D, 30D, 1000D IR, EOS DCS 3c, EOS D2000, 16-35/4L IS, 100/2,8 Macro, 70-200/2,8L IS II, 24-105/4L, 85/1,8, 50/1,4, 24/1,4L II, 300/2,8L IS, Helios 58/2

Darktable, RawTherapee, Photomatix, Luminance HDR, GIMP 2.10.6.
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