nightfly
Well-known
Was just developing some photos from my m9 in Lightroom and noticed this strange vertical purple line in some photos of twilight horizon (see detail attached)
Anyone know what causes this?
Anyone know what causes this?
willie_901
Veteran
ISO/shutter time/ and aperture please?
While I don't think this is due to an unusually low signal to noise ratio, it's possible the signal (light) level is so low an otherwise irrelevant artifact became visible.
With all digital camera brands one sees all manner of artifacts when the noise/artifacts' level approached the signals' level.
No matter... 30 seconds in PS will repair the problem without consequence.
While I don't think this is due to an unusually low signal to noise ratio, it's possible the signal (light) level is so low an otherwise irrelevant artifact became visible.
With all digital camera brands one sees all manner of artifacts when the noise/artifacts' level approached the signals' level.
No matter... 30 seconds in PS will repair the problem without consequence.
MCTuomey
Veteran
I think the reason this file data is important is that the longer the exposure and the higher the iso level, the more likely excessive heat begins to cause artifacts. But it can also be caused by poor SD card performance.
If the problem is showing up in high(er) iso shots, try reformatting (full, not quick, and external, not in-camera) your SD card and/or try a freshly externally formatted card of another brand. You could be seeing a read/write problem rather than a camera problem.
If the SD reformat doesn't help, and you're bothered by the post-processing solution longer term, a trip to Leica service is next to see whether a simple pixel re-mapping or a sensor/motherboard replacement is needed. Pixel re-mapping is more common for random stuck pixels. Lines usually call for part replacement, as far as I know.
Before someone goes off on Leica for this problem that does seem to surface with the M9, Nikon had a very similar issue with some of their early-mid Dxx series and had to replace sensors for a period of time to address the issue.
Richard G
Veteran
Bad pixel. Leica can remap the sensor and get rid of the lines from low light images affected by a rogue pixel like this.
squirrel$$$bandit
Veteran
Yes, it does look like the sensor defect that affected my M8, years ago. Leica NJ replaced the sensor.