Negative images - M8

[MSmelik]

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In Solms the heart attack rate must have dramaticaly risen lately.

C'm on this can't be real.

I'm working on a documentary covering the Dutch elections at the moment, using my MP and a Nikon DSLR, the Leica beats the Nikon on every aspect exept the postprocessing.

So much I hoped to have the solution in my hands with the M8, and now I feel so disappointed seeing these images. Purchase doesn't seems to be an option.

Sometimes I wonder whether it's not all just a bad dream.

Waking up one morning and finding out it all wasn't true will most probably not happen.

Oh dear, what misery

 

 

What a coincedence, our production company is working on exactly the same topic, but have disregarded the M8 as an alternative for the stills, this due to the known problems. The stills guy uses his 5D and even sony r-1 instead. Now personally I havent a clue about quality issues, but I can asure you that my stills guy is an absolute pro and does know what he'se talking about.

 

Me, personally, I'm just continuing to use my M8 I'm happy with the images it supplies me, and I will patiently await how leica will solve this. But then my images are not used to make money with.....

 

Just thought I'd mention this incoherence of facts----

[rob_x2004]

probably badly underexposed. I have another similar shot which is fine at 1/60s, but this one was shot at 1/750s.

 

Yea I saw the Exif, and figured this whole thing was a wind up. Peter, who can read a manual explains the multiple exposure. I guess this camera is just no damned good if you want to use it for photos massively underexposed. Leave it to you guys. Whatever.

[brucek]

Read the manual about long exposures and pictures in low light. Camera re-reads the "Dark " sensor. If you arn't careful you can indeed double expose etc.

 

Peter:

 

How can this result in a double exposure?

 

What the manual is referring to is called a dark frame, where the CCD is "exposed" to the closed shutter for the same amount of time as the normal image was exposed. The camera then subtracts the dark frame noise from the image to reduce the amount of noise in the image. In no way should a double exposure be possible when this is done. Ths shutter should remain closed.

 

Bruce

[chetccox]

I have seen this happen before on canon dslr cameras, and no I don't think it is possible to get a double exposure because of the dark frame subtraction. The faulty images were caused by faulty writes to the sd card. This can be caused by the camera but is most likely the card itself. I would suggest you put in a different brand sd card and see if it happens again.

[roblumba]

It shure looks like it could be a SD card write problem, however, I think it's very strange that the image is so strangely manipulated. Usually, when I have card writing issues, the file does not open at all, or there is a portion of the image completely missing. However, that is with RAW format. I don't know how a corrupt file would behave in DNG or JPEG format. I suppose if one or more channels (R,B,G) of informaiton where missing, you could get something funny.

 

It's also possible this is a corner case issue where the user found a rare combinations of circumstances that caused the hardware or firmware to malfunction. This would be dependent on a variety of variables. Such as taking many successive shots, filling the buffer, then changing the ISO and taking a shot, viewing a photo, deleting a picture, taking another shot, on and on.

 

I work at Toshiba as an ASIC hardware verification engineer and todays chips are extremely difficult to verify all the possible "corner cases". In fact, the industry is moving away from depending on primarly hand written or randomized testing techniques to using more mathmatically intensive formal verification techniques which more intelligent hit these corner cases. However, it's a slow and difficult move in techniques that requires dedicated resources, expensive tools, difficult to lean experience, and lots of time. Few companies are doing this, I would not be suprised if we found one here.

[chetccox]

I have had no problems with the M8, but I had similar pictures (always the raw files, never the jpg). This occured on a canon dslr, and most recently on a sony R1. All of the files were similar to what has been presented here, with negative and double exposure combined. It was definitely the sd card.

[edlbell]

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I have had no problems with the M8, but I had similar pictures (always the raw files, never the jpg). This occured on a canon dslr, and most recently on a sony R1. All of the files were similar to what has been presented here, with negative and double exposure combined. It was definitely the sd card.

 

Lets hope it is the SD card. The card was one that was borrowed while at the store. The only issues I have had since using MY SD cards is the DNG files that appear to be partially written. It is always the last shot before I turn off the camera, so I can only assume that the camera is in the process of writing the file when I turn off the camera as it stops writing.

 

I only posted the file to increase awareness of real world issues happening with the M8, with the hope that these issues can be worked on by Leica.

 

Ed

 

Don't I look like a very happy customer in that photo.

[carstenw]

Yea I saw the Exif, and figured this whole thing was a wind up. Peter, who can read a manual explains the multiple exposure. I guess this camera is just no damned good if you want to use it for photos massively underexposed. Leave it to you guys. Whatever.

Honestly, I am not concerned. I don't plan on massively under- or over-exposing my shots, although I do feel that it ought to behave "normally" when I do, and not invert the image. The SD card I used was a cheapo 1GB SanDisk blue card. Meanwhile, my Extreme III 2GB card has arrived, so we'll see if it ever happens again.

[wparsonsgisnet]

I have seen this happen before on canon dslr cameras, and no I don't think it is possible to get a double exposure because of the dark frame subtraction. The faulty images were caused by faulty writes to the sd card. This can be caused by the camera but is most likely the card itself. I would suggest you put in a different brand sd card and see if it happens again.

 

Ed, if your "double exposure" was caused by the SD card, it might not have been a faulty card.

 

If you have not read materials on handling your SD card, it is usually recommended to do the following:

 

1. Copy your images to the computer and also to a backup medium (whatever the sort) as soon as possible.

2. Format the card -- IN THE CAMERA .

3. Do NOT do any file manipulation FROM THE COMPUTER with the Sd card, such as erasing some or all of the files .

4. It is recommended to reformat the card each time you "erase" files.

 

5. (optional) Since these data cards are brittle and sensitive, use multiple cards when you are capturing important material. Then, if you have problems with a card, at least you will have the images on the other card.

 

What a great image. Regards,