Can You Replicate this Problem?

[jbf]

Hi guys/gals/friendlypeoples,

I am having a problem with my x100 and I was hoping you guys would be able to try this out with your camera and tell me if you get similar results.


If you can, sit in a dark-ish room with a dim light source. For me, I tried this at my work desk (we work in the dark with only a lamp and light coming from two computer monitors). If I set my camera to 3200 RAW with a F stop of 2 and a shutter speed of 1/4th of a second and take a picture of say my legs or an area that has light but also dark areas in the image, I notice considerable banding in the image.


Can you do the same for me and take photos/post to let me know if I can see the same thing?


I havnt seen this problem in others pictures so far, and no reviews have mentioned the banding at high iso's and many here report the ability to use the camera in very dark light even up to 6400 ISO with no problem. This is quite contrary to what I have ntoiced. Images in dim light with a shutter speed of 1/15, 1/8, 1/4 I see large amounts of what looks like feedback loop (not just chroma noise but banding) in the images.


Any help would be greatly appreciated.

 

[Spyro]

I think noise depends largely on the quality of light not just the quantity.
I haven't done any scientific testing but in my experience mixed artificial light with varying temperatures is pretty much the worst. Can you try the same with another digital camera to compare?

 

[willie_901]

Please repeat this in a room with only incandescent (tungsten) light.

Slight banding was reported in early March at ISO 6400.

You may want to consider that the actual X100 ISO is never greater 1600. At ISOs higher than 1600 the in-camera processing just boosts the exposure using firmware. This is true for both jpeg and raw modes. The best way to obtain results at ISO 6400 would be to shoot in raw at ISO 1600 and simply increase the exposure slider by 2 stops during post processing. The result will be essentially similar to what the X100 does in-camera. However you will have much more control over the final result compared to automatic in-camera processing.

There is a X100 in-camera raw mode where you can create a set of jpegs with different processing parameters from a single RAW file. This is done entirely in-camera using the X100 menus. You turn the raw data into a jpeg and store it on the internal memory card. I never record jpegs with my X100, so I have no idea if you can increase the exposure by 2 stops in-camera. You may wish to try this at ISO 1600 too.

 

[bigeye]

Yah, sounds like it's the light source...

 

[jbf]

The lighting is tungsten lighting with only extra light coming from two incredibly high end HP dreamcolor LCD panels.


I will try shooting at 1600 and pushing exposure two stops in lightroom/camera raw however.



Can you guys please post your own examples of taking images in low-contrast subdued lighting at iso 3200 with shutter speeds of 1/8, 1/4, 1/15 please?