jaapv Posted December 8, 2013 Share #21 Posted December 8, 2013 Advertisement (gone after registration) My understanding (which may be incorrect) of the way this works is that for some reason a single bad pixel can cause a cascade effect in all the pixels below it, which then produces the vertical lines noted above. In most cases identifying the bad pixel, and then preventing that bad pixel from providing an output (or discarding or ignoring its output), would result in the elimination of the one bad pixel from the resulting image, and not in the elimination of a whole line of pixels. I will speculate that pretty much the same signal processing method is already occurring in the maestro processor with dark frame image processing to reduce or eliminate thermal sensor noise from long exposure time images taken at high ISOs under dark or nighttime conditions. Pixels that have high levels of thermal noise are eliminated from the resulting image through Leica's dark frame image processing techniques. Such high thermal noise pixels occur on a fairly random basis in almost all camera sensors, as do bad or hot pixels. Dark frame image processing is also a standard digital signal processing technique employed in just about all modern digital cameras. Another way to attack the problem might be to prevent or inhibit the bad pixel cascading effect, which might be possible in firmware (as opposed to identifying bad pixels and then preventing their outputs from affecting resulting images). Whatever the case, it seems pretty evident that the bad pixel problem is begging for a quick firmware solution from Leica.Quick?…. Link to post Share on other sites More sharing options...
Advertisement Posted December 8, 2013 Posted December 8, 2013 Hi jaapv, Take a look here ISO 640 / jpg, Sensor issues!! HELP!. I'm sure you'll find what you were looking for!
Marac Posted December 8, 2013 Author Share #22 Posted December 8, 2013 A friend techy kinda guy informed me that he fixed a dead pixel on a Canon 5D by doing a very long exposure with the body cap on? Does this make any sense to anyone? I know its a different beast but worth a try? Link to post Share on other sites More sharing options...
Daniel Beacock Posted December 8, 2013 Share #23 Posted December 8, 2013 I had the same problem as you and Berlinman and I know of at least one other user who also had it. It seems to definitely be a weakness on the CMOSIS sensor at 640 ISO. Mine was remapped and it works fine now, after a month round trip to Solms and back to London. Like you I thought about just not using 640 but was surprised at how many shots I had at 640. It would also make auto ISO useless of course. Link to post Share on other sites More sharing options...
suneohair Posted December 8, 2013 Share #24 Posted December 8, 2013 A friend techy kinda guy informed me that he fixed a dead pixel on a Canon 5D by doing a very long exposure with the body cap on? Does this make any sense to anyone? I know its a different beast but worth a try? It does make sense. A common fix for LCDs is cycling through the primary colors rapidly. This sometimes forces them to become "unstuck". So the same theory may apply to sensors. Link to post Share on other sites More sharing options...
Marac Posted December 9, 2013 Author Share #25 Posted December 9, 2013 This really is the last straw!!! I have just used a blower to clean the sensor before a shoot tomorrow (at ISO 200) and a lump of coating just fell off the sensor leaving a 3-4mm chunk that is showing up BIGTIME on every shot … WTF! I am seriously lost for words, I have no idea what to do next, this has really put a dent in my passion to shoot with the M240. I cannot sleep, will call the store in the morning and see what they suggest. I am now worried that Solms may think that I have caused the damage myself. I was going to live with the ISO 640 problem until new year and simply shoot avoiding 640, now I cannot use the camera at all I am devastated, deflated, and honestly at a loss ….. I also feel a little angry. Really. Link to post Share on other sites More sharing options...
tundraline Posted December 9, 2013 Share #26 Posted December 9, 2013 Quick?…. By quick I mean the sooner Leica fixes this problem, the better for them and users of M240 cameras. While any fix is likely to be complicated and time-consuming, that doesn't mean a fix shouldn't be pursued with all possible haste. This problem appears to be quite serious. Ignoring the problem and/or dealing with it by fixing cameras on a one-off basis seem to be bad ideas. It also begs the question of whether Leica/CMOSIS sensor quality control is adequate in view of recurring reports of M240 users experiencing exactly the same problem. Link to post Share on other sites More sharing options...
Marac Posted December 9, 2013 Author Share #27 Posted December 9, 2013 Advertisement (gone after registration) So the saga continues .. I checked the shutter count using a Hex/Decimal converter, remember this is a new replacement for my sensor damaged M240, 33,121 that seems a bit high to me for a new camera? I am at a total loss how this kind of damage can occur from a hand blower, it seriously looks to me like someone attacked it with a screw driver, however I can swear on a stack of Bibles I certainly did not go anywhere near the sensor at all, I have sent this to Leica and dread their reply.. Opinions? Seriously this could happen to anyone (had to be me though) so please be very careful 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! 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/218042-iso-640-jpg-sensor-issues-help/?do=findComment&comment=2483486'>More sharing options...
jip Posted December 9, 2013 Share #28 Posted December 9, 2013 So the saga continues .. I checked the shutter count using a Hex/Decimal converter' date=' remember this is a new replacement for my sensor damaged M240, 33,121 that seems a bit high to me for a new camera? [/quote'] The HEX to DEC converter no longer works on the M240, since they changed the unique number algorithm. Every picture you take will show a totally different number. Link to post Share on other sites More sharing options...
jip Posted December 9, 2013 Share #29 Posted December 9, 2013 Nice Flickr photo album' date=' Jip. Thank you. My family and I used to live in Maastricht. We miss the Netherlands.[/quote'] Thanks!! Although I am currently located in Belgium mostly Link to post Share on other sites More sharing options...
Marac Posted December 9, 2013 Author Share #30 Posted December 9, 2013 Just spoke with a very nice lady at Mayfair Leica centre and she was AMZING! The camera is fully covered by my Passport (only had it a month) and they are going to loan me an M9 until it has been repaired on the 5 day service. FREE OF CHARGE. Now THAT is what I call good service and after sales care. I will keep you all informed of cause but what seemed like the end of the world last night has turned into a small matter of waiting a week or 2 and having the torturous problem of using an M9 in the meantime. Link to post Share on other sites More sharing options...
tundraline Posted December 9, 2013 Share #31 Posted December 9, 2013 Thanks!! Although I am currently located in Belgium mostly We used to go for weekend hikes from Maastricht mostly in Belgium, Germany and Luxembourg -- lots fewer people. The Hurtgen Forest was one of our favorites, as was the area around Vianden and Bitburg. Beautiful places. Link to post Share on other sites More sharing options...
Marac Posted December 9, 2013 Author Share #32 Posted December 9, 2013 You guys may find this hard to believe, The technician at Leica Mayfair certainly was gobsmacked. Took my M240 down to them today and picked up, not an M9, but another M240 they had there as a loan camera while mine is away being repaired, Many Thanks. So just for a laugh Im explaining to the guys & ladies there how I have had 2 M240's both with lines on the sensor at ISO640, so I stick a lens on, in store and shoot a pic of my bag on the table at ISO 640 … anyone fancy guessing what happened next? Nervous laughter filled the room, I broke the timid half silence with "That's a hatrick for me". I expressed my concern to the technician and asked that he have Leica in Solms check my camera at ISO 640 AFTER they have fixed it ….. just, in case, you know … well, it is possible after all. 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! 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/218042-iso-640-jpg-sensor-issues-help/?do=findComment&comment=2484002'>More sharing options...
jaapv Posted December 10, 2013 Share #33 Posted December 10, 2013 Well, you certainly had me checking my camera @ 640... Fortunately the score remains at 3-0. Link to post Share on other sites More sharing options...
Marac Posted December 10, 2013 Author Share #34 Posted December 10, 2013 I have always liked the 'tone' and 'look' of images from a leica at ISO 640 (digital) so I use it a lot. The Tech said that maybe most users do not use 640 as religiously as I do and so not many even realise there is an issue. He stated that he would definitely be letting Solms know about it. Hopefully everyone who reads this will check their own at 640, surely I am not the only one.. I shall be visiting a Priest if I am.. Link to post Share on other sites More sharing options...
lethbrp Posted December 10, 2013 Share #35 Posted December 10, 2013 I have always liked the 'tone' and 'look' of images from a leica at ISO 640 (digital) so I use it a lot. The Tech said that maybe most users do not use 640 as religiously as I do and so not many even realise there is an issue. He stated that he would definitely be letting Solms know about it. Hopefully everyone who reads this will check their own at 640, surely I am not the only one.. I shall be visiting a Priest if I am.. Are you shooting RAW or JPG, does it happen on both file formats at 640? Link to post Share on other sites More sharing options...
Marac Posted December 10, 2013 Author Share #36 Posted December 10, 2013 In all cases it happened in the DNG and in the JPG yes. Link to post Share on other sites More sharing options...
woopie Posted December 10, 2013 Share #37 Posted December 10, 2013 I have always liked the 'tone' and 'look' of images from a leica at ISO 640 (digital) so I use it a lot. The Tech said that maybe most users do not use 640 as religiously as I do and so not many even realise there is an issue. He stated that he would definitely be letting Solms know about it. Hopefully everyone who reads this will check their own at 640, surely I am not the only one.. I shall be visiting a Priest if I am.. An exorcist would be better...;-) Sent from my iPad using Tapatalk Link to post Share on other sites More sharing options...
Daniel Beacock Posted December 10, 2013 Share #38 Posted December 10, 2013 I have always liked the 'tone' and 'look' of images from a leica at ISO 640 (digital) so I use it a lot. The Tech said that maybe most users do not use 640 as religiously as I do and so not many even realise there is an issue. He stated that he would definitely be letting Solms know about it. Hopefully everyone who reads this will check their own at 640, surely I am not the only one.. I shall be visiting a Priest if I am.. No, you're not the only one, we are an exclusive club, but I fear our ranks are swelling! Was it David at Mayfair, or the guy in the white lab coat and glasses? David was the guy I dealt with and he was very helpful. That's at least three they've had with that fault at the same store! Surely Solms must track fault reporting and be aware that there is an issue here? Link to post Share on other sites More sharing options...
Marac Posted December 11, 2013 Author Share #39 Posted December 11, 2013 I was seen by an array of gorgeous young ladies dressed in black bearing gifts of hot chocolate and mince pies. The tech I saw was indeed the gentleman with the white coat and glasses …. Exclusive club you say? …. T-shirts all round I say Link to post Share on other sites More sharing options...
leica1215 Posted January 12, 2014 Share #40 Posted January 12, 2014 You guys may find this hard to believe, The technician at Leica Mayfair certainly was gobsmacked. Took my M240 down to them today and picked up, not an M9, but another M240 they had there as a loan camera while mine is away being repaired, Many Thanks. So just for a laugh Im explaining to the guys & ladies there how I have had 2 M240's both with lines on the sensor at ISO640, so I stick a lens on, in store and shoot a pic of my bag on the table at ISO 640 … anyone fancy guessing what happened next? Nervous laughter filled the room, I broke the timid half silence with "That's a hatrick for me". I expressed my concern to the technician and asked that he have Leica in Solms check my camera at ISO 640 AFTER they have fixed it ….. just, in case, you know … well, it is possible after all. I have had the similar issue by one vertical column color slight different so I updated the firmware 2.0.0.12, it does help my problem somehow, after I updated the latest firmware, my image has one vertical lines like you have, I wonder if firmware update has mapping function in it, if so, can I re update my firmware again, hoping it will mapping again and save my trip to Solms Link to post Share on other sites More sharing options...
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