Dead / Stuck pixel on M240?

Merelyok

Merelyok

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Oct 2, 2008
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I've got an M240 that's about a month old, and i just realized that there seems to be a persistent white speck on the LCD.

It's on about 50% of the shots and always in the same position.

When i zoom in all the way on the LCD, it just looks like a whited-out pixel.

However, when i open up the DNG files in Bridge, that particular speck is not visible in every single shot.

I've only done some minor cleaning to the sensor so far (i.e. blowing of air via air blower (Not compressed air) and light cleaning with an arctic butterfly.

I guess i shouldnt be that bothered if it doesnt end up affecting the end product, but i'm just wondering how in the world it got there!
 
Cosmic radiation - Neutron hit….
ACR will automatically remove it -most of the time. Leica can map it out for you.
 
I see that I have to trot out the scientific papers once more, if I find the time. A Nwutrino would never have the energetic impact to disturb the silicon matrix of the sensor.
 
oh well.

such is my luck.

I believe i had the same issue with the M9 (a single red speck).

Barely into a month's usage with the M240 and it has struck!

:rolleyes:
 
So, I just returned from my local service centre. Confirmed 2 dead pixels. Unfortunately I have to ship it out to Germany to get it fixed. Estimated 2 months turn around. Sigh.

I'm thinking of asking them to change it to a black leica dot instead. That's the only consolation I can think of, which is pretty sad for
A camera that I've only
Owned for a month!
 
You need one of them new fangled camera thingies that has a 'flexable sensor', up to 36 on a strip. With a flick of your thumb you pulll a brand new sensor into the focal plane after every shot.
 
zuiko85 said:
You need one of them new fangled camera thingies that has a 'flexable sensor', up to 36 on a strip. With a flick of your thumb you pulll a brand new sensor into the focal plane after every shot.
Click to expand...

Ya know what, i was just thinking the same.

That silver MP they had at the service centre looked so damn nice.

We'll see i guess..

Shall order A 35mm Cron in the meantime to comfort myself.

:D
 
I got my M9 remapped and within a couple of months I had some hot pixels back, I only shoot raw so they are fixed by lightroom anyway. If I was you I would wait until near the end of your warranty then send it in to Leica for a remap while its there they will check everything else over. Leica should have by now had the remapping built in, I have remap my Canon Idxs every six months or so it takes about a minute to do, it took a month to get the same thing done on my M9!
Good luck.
 
Fraser said:
I got my M9 remapped and within a couple of months I had some hot pixels back, I only shoot raw so they are fixed by lightroom anyway. If I was you I would wait until near the end of your warranty then send it in to Leica for a remap while its there they will check everything else over. Leica should have by now had the remapping built in, I have remap my Canon Idxs every six months or so it takes about a minute to do, it took a month to get the same thing done on my M9!
Good luck.
Click to expand...

i had a hot pixel on my m9 that i didn't bother with.

i'm just annoyed it happened so quickly on my month old M. (2 pixels to boot!)

I shoot only raw as well and it doesn't show up when i import it over via bridge. but still....!
 
Those damn neutrons.

Aircraft typically receive about 2 μSv/h, of neutron exposure due to cosmic radiation and solar flares. This level is about 70 times lower at sea level. Solar flares can increase this level by slightly less than a factor of two (Atmospheric and Climate Sciences, 2013, 3, 481-485.)

For comparison, The American Dental Association reports the average radiation exposure (not neutrons of course) from typical dental X-Rays is 0.15 mSv.

So, it appears Merelyok has very bad luck.

During thunderstorms neuron flux can increase to 300 to 500 neutrons per square cm per second.

It's a miracle photographers who live in regions where strong thunderstorms frequently occur don't experience total sensor failure.
 
willie_901 said:
Those damn neutrons.

Aircraft typically receive about 2 μSv/h, of neutron exposure due to cosmic radiation and solar flares. This level is about 70 times lower at sea level. Solar flares can increase this level by slightly less than a factor of two (Atmospheric and Climate Sciences, 2013, 3, 481-485.)

For comparison, The American Dental Association reports the average radiation exposure (not neutrons of course) from typical dental X-Rays is 0.15 mSv.

So, it appears Merelyok has very bad luck.

During thunderstorms neuron flux can increase to 300 to 500 neutrons per square cm per second.

It's a miracle photographers who live in regions where strong thunderstorms frequently occur don't experience total sensor failure.
Click to expand...

I do live right smack on the equator where thunderstorms are a common affair.

Maybe i should just leave it, seeing the rotten luck i have with sensors. For all i know, those dastardly neutrons might attack a week after i get it back from the factory!
 
I'd probably leave it for now, till either you have other issues with the camera or near the end of warranty period. I have a few cameras that have/had hot pixels on sensor. In practice, it's not an issue for me, and there is no guarantee that new one won't pop up right after you get the camera back from the manufacturer. Losing 2 months for this is a bit too much unless you have another M body to shoot with, IMHO.
 
Merelyok said:
I do live right smack on the equator where thunderstorms are a common affair.

Maybe i should just leave it, seeing the rotten luck i have with sensors. For all i know, those dastardly neutrons might attack a week after i get it back from the factory!
Click to expand...
But then, you are well placed for cosmic radiation which is concentrated at the poles. There are studies that suggest (but others that don’t) that aircraft crew flying regularly on the transpolar route have an increased risk of Myeloma of the brain from cosmic radiation..

Some companies like Sony will not ship sensors by air for this very reason.

I know it proves nothing, but I will stow my cameras vertically on flights, to reduce the potential target for cosmic radiation to the minimum. And I haven’t had a hot pixel in fifteen years.
 
Wow, I'll bet the sensor on any DSLR on the ISS gets walloped but good after a relatively short time. I wonder what happenes to cameras on the space station in a 6 month period.
 
What a Drag, sorry to hear !

Thats why I can't see buying into thousands of Dollars into Digital equipment ...
Just give me an X1/ X2 or a DPMerrill and I'd be Happy ;)
 
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