Frank Black Posted January 1, 2014 Share #1 Posted January 1, 2014 Advertisement (gone after registration) I want to buy a M8, 2 years after i sold mine.... Could not resist temptation, I found one, in good condition, shutter replaced 3000 actuactions ago and CLA and new sensor,3 years ago... Also it come from a seller from which a i have a very good vibe... I ask him to take some shots Most are a beauty....i missed the M8 files... one has a vertical line, with iso 1250... But the white wall test confuses me.... This is a jpg, auto wb on ligh room Any ideas? 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/219400-m8-sensor-problem/?do=findComment&comment=2499552'>More sharing options...
Advertisement Posted January 1, 2014 Posted January 1, 2014 Hi Frank Black, Take a look here M8 Sensor problem?. I'm sure you'll find what you were looking for!
lct Posted January 1, 2014 Share #2 Posted January 1, 2014 I just see the wall here. 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/219400-m8-sensor-problem/?do=findComment&comment=2499680'>More sharing options...
Frank Black Posted January 1, 2014 Author Share #3 Posted January 1, 2014 Really lct? so you do not see the smear on the right side of the photo? and the colour diference? did you read that i wrote WHITE wall? no need to help but spare me ... Link to post Share on other sites More sharing options...
wda Posted January 1, 2014 Share #4 Posted January 1, 2014 The smearing could be somewhat careless sensor cleaning. Examination with an illuminated loupe should show you what is there. Better than a partially in focus wall, regardless of colour or lighting WB. Link to post Share on other sites More sharing options...
lct Posted January 1, 2014 Share #5 Posted January 1, 2014 Really lct?so you do not see the smear on the right side of the photo? and the colour diference? did you read that i wrote WHITE wall?... Sure but i expected a vertical line that i don't see here. Could you put your DNG file in a Dropbox for upload? Link to post Share on other sites More sharing options...
koray Posted January 1, 2014 Share #6 Posted January 1, 2014 How can you be sure that the wall is perfectly flat and evenly illuminated? K. Link to post Share on other sites More sharing options...
250swb Posted January 2, 2014 Share #7 Posted January 2, 2014 Advertisement (gone after registration) To me the picture looks like an out of focus and under exposed old plastered wall lit by something like a table lamp. If it isn't you may have a big problem, if it is what else were you expecting? If it is a 'test' it doesn't look like a proper exposure was made of the white wall, compensating as you must for the meter wanting to make an exposure for medium grey, so the wall needs to have + compensation added (over expose ). Under exposure and out of focus and artificial light of an unknown colour temperature and not many Auto White Balance readings will be accurate. The under exposure, and possibly being out of focus, will exaggerate textures in the wall and make any meaningful analysis impossible. If however it is a fully exposed perfectly flat and perfectly white (no tint) wall lit by a perfectly even light source from a considerable distance then there is something awry with the camera, but get any one element wrong and the test itself is faulty. Steve Link to post Share on other sites More sharing options...
Frank Black Posted January 2, 2014 Author Share #8 Posted January 2, 2014 The smearing could be somewhat careless sensor cleaning. Examination with an illuminated loupe should show you what is there. Better than a partially in focus wall, regardless of colour or lighting WB. Yes i asked the seller to check that also, White balance was correct when i made the shot and i could clearly see on my screen that something was there, The auto white balance on light room i just used to enhance what i saw, The out of focus i did it on purpose, Quote from photonet... For a test shot, I intentionally over-exposed (around +1 stop) a mostly out-of-focus shot of a clear, off-white wall (in my office), popped the shot into Lightroom, did a 1:1 exam, and I cannot find a single spot. I looked several times. It appears to be perfectly clean now! I was looking for dirt spots on the sensor...not expecting what it come out... so nothing wrong with the test... Thanks anyway for the straight forward answer Link to post Share on other sites More sharing options...
Frank Black Posted January 2, 2014 Author Share #9 Posted January 2, 2014 Sure but i expected a vertical line that i don't see here.Could you put your DNG file in a Dropbox for upload? Hi lct, i apologise,i think i did not explain well on my opening post, The vertical line is not on this one, I can post it here,on jpg... I can live with the vertical line on high iso...just not sure if that can lead to other problems... So...one photo on iso 1250 has a vertical line... the posted photo above has this strange effect.. I can send you the dng, if you would like to help,i would be thankfull for your help... I just wanted to start on this one and then go to the vertical line issue, to keep it under control here... Link to post Share on other sites More sharing options...
Frank Black Posted January 2, 2014 Author Share #10 Posted January 2, 2014 How can you be sure that the wall is perfectly flat and evenly illuminated? K. Because i made the shot myself.... One light source, difuse sun light, Wall was flat enough, and if not the out of focus would have taken care of it... Link to post Share on other sites More sharing options...
Frank Black Posted January 2, 2014 Author Share #11 Posted January 2, 2014 To me the picture looks like an out of focus and under exposed old plastered wall lit by something like a table lamp. If it isn't you may have a big problem, if it is what else were you expecting? If it is a 'test' it doesn't look like a proper exposure was made of the white wall, compensating as you must for the meter wanting to make an exposure for medium grey, so the wall needs to have + compensation added (over expose ). Under exposure and out of focus and artificial light of an unknown colour temperature and not many Auto White Balance readings will be accurate. The under exposure, and possibly being out of focus, will exaggerate textures in the wall and make any meaningful analysis impossible. If however it is a fully exposed perfectly flat and perfectly white (no tint) wall lit by a perfectly even light source from a considerable distance then there is something awry with the camera, but get any one element wrong and the test itself is faulty. Steve Steve not a 'test'... Its checking simple things out....test is just a fancy word that we like to use when we speak about this stuff on the internet, . You are right...photo is slightly out of focus...i already explained why i did that,surprised that it can be a point, its not underexposed, i did that when converting to jpg so it was easy to see the strange effect, White balance was 5000 kelvin,time of the day was 15 hour, overcast day, which should give in the area where i live around 6000 to 8000 outside, and around 5000 to 6000 inside without any artificial light source, Even if there was any interference ,from artificial light source, it should never be redish or purple...the smear comes from the side close to the window, so if anything it could give a blueish tint... And in Kelvin,the ''latitude'' with high temperatures is wide... Mostly you will get problems with colours beneath 3500K... out of focus does exagerates textures, depending on the distance to the subject,in this case the wall, Out of focus in this case was intended to check the ''oil spots'' and dirt on the sensor, The effect i mention and try to find a explaination has nothing to do with it... What i mean, is that i did everything as i should, Conclusion is till now... Sensor can be dirty ? Something wrong with sensor? i asked the seller to perform same test and we will see, Thanks Link to post Share on other sites More sharing options...
250swb Posted January 2, 2014 Share #12 Posted January 2, 2014 Have you got a normal photo that looks like that? If not what does it say about the 'test'? Go and photograph a garden, and look for the artefacts then. All I can see is the camera being tortured for no good reason. The point about having an image in focus is to try and differentiate between the textures of the wall and any sensor problems that won't be in focus. But it shouldn't be a textured wall in the first place. Steve Link to post Share on other sites More sharing options...
Frank Black Posted January 2, 2014 Author Share #13 Posted January 2, 2014 Have you got a normal photo that looks like that? If not what does it say about the 'test'? Go and photograph a garden, and look for the artefacts then. All I can see is the camera being tortured for no good reason. The point about having an image in focus is to try and differentiate between the textures of the wall and any sensor problems that won't be in focus. But it shouldn't be a textured wall in the first place. Steve Im not torturing the camera as you say, what do you even mean by that? pfff I just had a doubt without any panic or fear,that i wanted to see if anyone could help ... i think you do not get the ''picture'' and you have a way of writing that i find hard to cope with... the camera has a problem, now i know that for sure...but thanks for trying,even if you could not.... better days will come where you can share your 'wisdom' Link to post Share on other sites More sharing options...
lct Posted January 2, 2014 Share #14 Posted January 2, 2014 Show us your pic Frank. Just put your dng file or your original jpeg in a dropbox as suggested above if you want us to help you. Link to post Share on other sites More sharing options...
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