IS your KM7D showing banding on the left side of the sensor at high iso?

Hello everybody,

I'm new to KM DSLR as I've recently got a used KM7D.

Few ago I was revising some snapshots I took to my tow daughters inside our apartment: the light was low so I had to crack up the ISO to 3200.

To my surprise I've discovered that the camera how visible banding in low light conditions when the ISO values is set to 1600 or above.

AS I cannot post the original images, I've replicated the phenomena by shooting the same subject to ISO 800, 1600 and 3200: you will notice that the images at iso 1600 and 3200 shows a visible banding on the left side which increases along with the ISO value.

I'm wondering: is this a known weakness of the KM7D CCD sensor or is just mine that is showing this phenomena?

Thanks a lot to whom who can provide some feedback.

Ciao.

No banding on the left side at 800 ISO

Moderate banding on the left side at 1600 ISO

Stronger banding on the left side at 3200 ISO

Joseph Balson wrote:

I don't see banding here.

Maybe the higher shutter speed caught the flickering of your LED lights?

Hi, if you focus your attention to the leftmost vertical lines of the images you will see that above 800 iso there is a slightalteration of the colors toward reddish. Unfortunately here cannot be seen clearly. I'll post some image where the problem is much more pronounced.

The flickering would have interested the whole image, I presume, with multi path lines: here the problem interest just one portion of the sensor.

Kind regards

I can't see any banding either .

I like my Dynax 7d as well and still use it occasionally , however you need manage your expectations with 19 year old technology .

Sensors have come on a long way since them , and ISO's of 1600 were very high then , 3200 should only be used for extreme cases . I don't use the d7d above ISO 400 .

My Sony a100 from 2006 was the same .

ISO 100 to 200 were great . 400 was the usual maximum . 800-1600 gave poor results and 3200 needed to be converted to black and white and coarser than Ilford 3200 film !

I think it's just the usual high ISO noise your looking at and perhaps your eyes are joining the dots ?

If I stare at the last image long enough I can see what appears to be a faint "Y" written on the wall in red crayon .

So it's hard to say what your seeing .

This is a crop of an image where you you can see the shift of the colors to red/violet on the vertical leftmost stripe of the image.

I hope that now the problem is more evident thah with the previous post.

Cheers.

neilt3 wrote:

I can't see any banding either .

I like my Dynax 7d as well and still use it occasionally , however you need manage your expectations with 19 year old technology .

Sensors have come on a long way since them , and ISO's of 1600 were very high then , 3200 should only be used for extreme cases . I don't use the d7d above ISO 400 .

My Sony a100 from 2006 was the same .

ISO 100 to 200 were great . 400 was the usual maximum . 800-1600 gave poor results and 3200 needed to be converted to black and white and coarser than Ilford 3200 film !

I think it's just the usual high ISO noise your looking at and perhaps your eyes are joining the dots ?

If I stare at the last image long enough I can see what appears to be a faint "Y" written on the wall in red crayon .

So it's hard to say what your seeing .

I know, I know, I normally use the KM7D in Daylight at low ISO however you may be amazed by the results, even at high iso, when ones process the RAW files through DXO Photolab and apply the basic noise reduction (I have an old version fo this software, so I haven't tried the Prime Noise reduction which seems to give even much better results).

Furthermore the grain of the images produced by the KM7D at high ISO isquite pleasing and aplies very well to Black and White and Retro look color style so I'm open to this possibilities., that's why I've raised the question about this phenomena which I discovered only yesterday.

Regards.

Joseph Balson wrote:

oh ok, now I see what you mean. I still don't think it is banding, but it also is defnitely not LED flickering (which does not always affects all the frame, but can create something that can look like banding in the photo).
I have to try to reproduce this with my 7D.

That would be useful to understand if the problem is only with my KM7D or if it is general.

Thanks a lot.

Is this happening all the time ( at high ISO etc ) or is just happening after you've taken quite a few shots or with long exposures ?

I remember with some Sony DSLR's a part of the camera ( processing chip perhaps ?) Warmed up and would cause a pink/purple glow in the corner of the frame .

Just a thought .

I'll see if I can replicate the band with my camera , but I can't say I've ever seen it before .

neilt3 wrote:

Is this happening all the time ( at high ISO etc ) or is just happening after you've taken quite a few shots or with long exposures ?

I remember with some Sony DSLR's a part of the camera ( processing chip perhaps ?) Warmed up and would cause a pink/purple glow in the corner of the frame .

Just a thought .

I'll see if I can replicate the band with my camera , but I can't say I've ever seen it before .

To be honest I realized about this issue only last night, but take into consideration that I have the camera from one and half a month and I seldom use it. When I discovered about Thai problem the camera was not under intense use so it was not hot nor even warmed.

I'll try to reproduce the symptoms as soon as possible and I'll post my findings here.

Cheers.