High iso images with horizontal lines. Leica T (701)

[marco febbrari]

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Good evening everyone, I need your experience. I recently bought a Leica T (701). In ambient light up to ISO 800 is perfect, from ISO 1600 up to 6400, horizontal lines appear throughout the image. Fine lines that I can only attenuate in post production. The T has installed firmware v. 1.9 and use it with R lenses with manual focus. I thought that maybe the frequency of the LED lights could affect the performance in high ISO conditions ... Or am I wrong when I expose ?. Have any of you had the same problem with the Leica T? 

Thank you all 

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[marco febbrari]

I forgot to write that I also get horizontal lines on the DNG!

Thanks

Marco

[jaapv]

You are right on both suppositions.
High ISO and underexposing will produce banding, especially on older cameras with lower high-ISO capability, like your T. Try exposing more liberally. A shot like you are showing with a strong falloff in light is particularly difficult, as you don't want to overexpose the foreground and still be able to lift the shadows, yet the high ISO setting has severely limited your dynamic range.
In post-processing you can combat noise and banding in a program like Topaz DeNoise AI.

LED banding is normally more pronounced and mostly seen in indoor shots, however a LED light source could of course have impact outside, attenuated by other light sources. I doubt that this is the case on the image you show, as your banding is more pronounced in the dark areas.

The best solution here would be to blend an image exposed for the foreground with an image exposed for the background in post-processing, but you will be using HDR techniques then - and it will only work on static subjects, unless you are willing to spend a lot of time in Photoshop.

[marco febbrari]

Thanks Jaapv, I thought the Leica T had a problem. It actually churns out very beautiful files for me. Reminds me of the Leica M8.

[jaapv]

Which was not very good at high ISO either