jaechong Posted June 4, 2014 Share #1 Posted June 4, 2014 Advertisement (gone after registration) I purchased a M 240 at Samy's in LA. I noticed several dead pixels at certain iso range so I exchanged with the new one today. I carefully examined some images(donno why I did that) and found one dead pixel visible when magnified 100%. I understand that there is no perfect sensor and am trying to ignore it because it doesn't show up once the dng file is processed. Hope Leica includes a remapping software in the next firmware update. Quote Link to post Share on other sites More sharing options...
Advertisement Posted June 4, 2014 Posted June 4, 2014 Hi jaechong, Take a look here dead pixel on M 240. I'm sure you'll find what you were looking for!
Berlinman Posted June 4, 2014 Share #2 Posted June 4, 2014 Check it at ISO640. Some dead pixels cause a dead line at that ISO. Must then be fixed by Leica. 1 Quote Link to post Share on other sites More sharing options...
jaapv Posted June 4, 2014 Share #3 Posted June 4, 2014 Lines are a problem, single pixels not, as ACR will do the remapping on DNG conversion. 1 Quote Link to post Share on other sites More sharing options...
jaechong Posted June 5, 2014 Author Share #4 Posted June 5, 2014 Thanks guys. Leica services in NJ suggested that I should get it fixed so I'm sending it to NJ . Quote Link to post Share on other sites More sharing options...
mmradman Posted July 29, 2014 Share #5 Posted July 29, 2014 Check it at ISO640. Some dead pixels cause a dead line at that ISO. Must then be fixed by Leica. Just noticed dead column, got the impression it happens randomly but at closer examination it appears regularly at ISO 640. OK, know now how to avoid it but does anyone can provide explanation why at one specific ISO setting & is it going to get worse. So, remedy is trip to Wetzlar, it is going to be slow with holiday season in full swing, it seems auto ISO will have to wait until this is fixed. Quote Link to post Share on other sites More sharing options...
bocaburger Posted July 29, 2014 Share #6 Posted July 29, 2014 Is there a specific way to shoot the test image? Because here's what I found: I took 2 shots @ ISO 640, jpeg-fine. One with the lens cap on at 1 sec. Another of an off-white wall, 50/1.4 @ 1.4 on A. In the lens cap on image, when I zoomed all the way on the camera's LCD it was a bright blue screen flashing, and there were tons of little black dots scattered everywhere (some in a vertical row but not a continouous line). When I imported that image into LR and viewed it at 100% I scanned it all over and could find nothing, it was totally black. With the shot of the door, in LR @ 100% I found one light-blue dot over to the left. So am I not doing it right or do I have just that one lone dead pixel? Quote Link to post Share on other sites More sharing options...
mmradman Posted July 30, 2014 Share #7 Posted July 30, 2014 Advertisement (gone after registration) I shoot DNG and 6Mp jpg files; jpg was clean, only showed on DNG file in ACR. I don't think rear LCD is any good to spot such anomalies. Quote Link to post Share on other sites More sharing options...
Daniel Beacock Posted July 30, 2014 Share #8 Posted July 30, 2014 Is there a specific way to shoot the test image? Because here's what I found: I took 2 shots @ ISO 640, jpeg-fine. One with the lens cap on at 1 sec. Another of an off-white wall, 50/1.4 @ 1.4 on A. In the lens cap on image, when I zoomed all the way on the camera's LCD it was a bright blue screen flashing, and there were tons of little black dots scattered everywhere (some in a vertical row but not a continouous line). When I imported that image into LR and viewed it at 100% I scanned it all over and could find nothing, it was totally black. With the shot of the door, in LR @ 100% I found one light-blue dot over to the left. So am I not doing it right or do I have just that one lone dead pixel? Try just taking a slightly underexposed shot of a plain blue sky. That worked for me and easily showed up a dead line at ISO640. I shot in RAW + JPEG but I'm guessing JPEG fine would work too. Also I wouldn't bother reviewing it on the LCD, it is identifiable but only if you zoom right in and track left to right until you come across it. It's so much easier to check it in Lightroom where you will see it in an instant. Quote Link to post Share on other sites More sharing options...
Daniel Beacock Posted July 30, 2014 Share #9 Posted July 30, 2014 Sorry, just realised you are looking for individual dead pixels. Yep, that's harder obviously, but again the principle is the same: plain homogenous background and review on Lightroom. Sounds like you may only have 1 dead pixel if the rest appears clear. Quote Link to post Share on other sites More sharing options...
bocaburger Posted July 30, 2014 Share #10 Posted July 30, 2014 (edited) I was looking for any pixel issues that might be significant enough to warrant repair. I shot the homogenous off-white door in "A" so naturally it was underexposed about 1-1.5 stops. So I guess that one pixel is it so far. The reason I shot jpeg to test was because I keep reading LR automatically maps out dead pixels from DNG's. But I recall something about testing for pixels by taking a shot with the lens cap on. Maybe that's for hot/stuck pixels, not dead ones. That would make sense I guess. Edited July 30, 2014 by bocaburger Quote Link to post Share on other sites More sharing options...
bocaburger Posted July 31, 2014 Share #11 Posted July 31, 2014 Well I tried the same shot again in DNG and there was no dead pixel to be found, so evidently LR maps it out in preview...unless there's a way to turn the function off???? Quote Link to post Share on other sites More sharing options...
BerndReini Posted July 31, 2014 Share #12 Posted July 31, 2014 If Lightroom maps it out, then just don't worry about it. When you get the blue line prone\blem, send in your camera. You will drive yourself nuts, if you worry about pixels that get corrected automatically. Quote Link to post Share on other sites More sharing options...
bocaburger Posted July 31, 2014 Share #13 Posted July 31, 2014 If Lightroom maps it out, then just don't worry about it. When you get the blue line prone\blem, send in your camera. You will drive yourself nuts, if you worry about pixels that get corrected automatically. Lightroom only maps out pixels if I shoot DNG, which I prefer not to do. So far the M240's jpgs have been remarkably pleasing. However the one dead pixel I was able to find is off in the lower left, about 10% up from the bottom and 20% in. In the rare instance it might actually impact a photo, it ought to be simple to clone it out in one click. And the reason I was testing is because my camera is <30 days and if it had a dead line I would press the dealer to collect it and exchange it rather than send it off @ my expense for Leica to take who knows how long repairing it. Quote Link to post Share on other sites More sharing options...
mirekti Posted August 2, 2014 Share #14 Posted August 2, 2014 (edited) I just quick examined mine, and found one. I am afraid what it will look like tomorrow when I get the blue sky available. :-) I didn't notice it before as I wasn't aware LR was automatically correcting it. As I started to use C1, the feature is gone so I'd like some fw option from Leica too, yet don't see it in any near future. The only problem is the pixel is close to the center of the frame. The photo is 11:1, but I can also see it on 1:2 on my 27" monitor. ...I found four more. The funny thing is two were blue, one white, and one kind of beige. Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Edited August 2, 2014 by mirekti Found more Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/228310-dead-pixel-on-m-240/?do=findComment&comment=2641594'>More sharing options...
mirekti Posted June 17, 2016 Share #15 Posted June 17, 2016 (edited) Well, it's been some time since the last post In the mean time I let the LR do its job in hot pixel removal, but few days back I found another issue. This time LR does not help as I'd presume this is not a hot pixel but something else. If you check the image you can see that the burned out area looks like a bit of dust not like a single square pixel. Does anyone have an idea what this might be? UPDATE: I did the same test as in 2014 by increasing it to 11:1. It seems as a bunch of hot pixels. Is there a way to tell LR which pixels are dead or do some trick to fix this automatically during the import? Option 2: Would it be possible to send a DNG with the lens cap on to Leica and they provide me with a file (similar to FW) which would do the remapping of these pixels or the camera would have to hit the road for this to be fixed? Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Edited June 17, 2016 by mirekti Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/228310-dead-pixel-on-m-240/?do=findComment&comment=3062919'>More sharing options...
jdlaing Posted June 17, 2016 Share #16 Posted June 17, 2016 When you import the photo are the hot pixels there? Quote Link to post Share on other sites More sharing options...
Exodies Posted June 17, 2016 Share #17 Posted June 17, 2016 I suppose it's an LCD artefact; otherwise why would mirekti show us shots of the screen? Quote Link to post Share on other sites More sharing options...
jaapv Posted June 17, 2016 Share #18 Posted June 17, 2016 Leica will tell you to send the camera in. This looks like it needs a new sensor. Quote Link to post Share on other sites More sharing options...
mirekti Posted June 17, 2016 Share #19 Posted June 17, 2016 (edited) Well, I will not send a three year old camera for a repair. Certainly not for a sensor which is a thing that was outdated even before it was released in the camera (in general, not only with Leica). I can live with it. If you check the whole picture it's not so huge, but it would be great if Leica provided an online service for pixel remapping/fix. I don't understand why this would need to go for a repair service. ...unless they want to charge something extra for it (even then it should be possible to fix it online). Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Edited June 17, 2016 by mirekti Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/228310-dead-pixel-on-m-240/?do=findComment&comment=3063475'>More sharing options...
jaapv Posted June 17, 2016 Share #20 Posted June 17, 2016 Why not? There is a good chance that it will be fixed for free. For a new sensor there is always a number of pixels mapped out. If the number of pixels to be mapped out reaches a certain value the sensor will be replaced - that goes for all brands of camera. Quote Link to post Share on other sites More sharing options...
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