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Buyantukhaa
Posts: 2289
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Help! Is My Camera Damaged?

Tue Feb 28, 2006 7:51 am

Recently I took some pics at night and I realised they all have the same dot (2x2 pixels) that shows up 1009 pixels East and 1485 pixels South of the upper left corner of the pic (when in landscape), or at the bottom of the pic slightly left of the middle. I use an Olympus C765UZ.

Let me show what I mean:

http://dacabeca.com.sapo.pt/KGDhotel.JPG
This pic is blurred and that's why I chose it: the dot is sharp and not blurred, unlike everything else on the pic. The dot is on the pavement, below the right end of the wall. You'll need to zoom to at least 100% to see it.

http://dacabeca.com.sapo.pt/Gdansk.JPG
Here the dot is hanging in the sky.

And to get back to aviation:

http://dacabeca.com.sapo.pt/ZRH.JPG
Here the dot is black!!!!

My question: is my CCD sensor damaged? If yes, how did this happen? And can it be repaired?

If no: then what am I seeing?

I've had the camera for 1,5 years now, and I don't know how many pics I have taken, I'd say about 10.000. What is the lifespan of a digital camera?

Any feedback would be greatly appreciated!
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dc10tim
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RE: Help! Is My Camera Damaged?

Tue Feb 28, 2006 8:06 am

It looks almost like a dead pixel on the sensor. There is another about 1/4 of the way across and about half way up on all 3 too, though it is not noticable. I haven't seen that before unfortunately, so have no idea how to go about getting rid of it. When editing photos though, you could simply clone it out and no-one would ever know it has been there.

Regards,

Tim.
Obviously missing something....
 
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Buyantukhaa
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RE: Help! Is My Camera Damaged?

Tue Feb 28, 2006 8:31 am

You're right about the other, I hadn't seen that before. Yes I can edit out this pixel, but it obviously wouldn't be very convenient... The only upside of it is that pics taken in daylight do not seem to suffer as much from this dead pixel...

Regards,
M
I scratch my head, therefore I am.
 
JeffM
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Joined: Sat May 07, 2005 3:32 am

RE: Help! Is My Camera Damaged?

Tue Feb 28, 2006 8:31 am

Quoting DC10Tim (Reply 1):
I haven't seen that before unfortunately, so have no idea how to go about getting rid of it.

You can't. Those pixels are stuck "on". It's not uncommon, I had on on my D100 after a week. Took it back. Have not had one show up on my Canon, but they are almost inevitable.

Just clone it.
 
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Buyantukhaa
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RE: Help! Is My Camera Damaged?

Tue Feb 28, 2006 9:10 am

Quoting JeffM (Reply 3):
It's not uncommon, I had on on my D100 after a week

Well, that's some consolation, at least I'm not the only one. I'll see if I am still within the guarantee period.

Two more: now I see no less than 17 of them?!

http://dacabeca.com.sapo.pt/Gdansk2.JPG

http://dacabeca.com.sapo.pt/Coral.JPG

Quoting JeffM (Reply 3):
but they are almost inevitable

Bad news...
I scratch my head, therefore I am.
 
mikephotos
Posts: 2887
Joined: Wed Nov 01, 2000 12:52 am

RE: Help! Is My Camera Damaged?

Tue Feb 28, 2006 2:36 pm

For other wanting to test their cameras for dead/hot-pixels, here's a good link:
http://www.starzen.com/imaging/deadpixeltest.htm

Mike

[Edited 2006-02-28 06:37:10]
 
Morvious
Posts: 637
Joined: Sat Feb 19, 2005 8:36 pm

RE: Help! Is My Camera Damaged?

Tue Feb 28, 2006 5:44 pm

Shoot with your lens hood on in a dark room, and exposure long (30 seconds is what I did).

You will see all of them.

I have 4 of them, not to big of a problem because they only appear on night shots, and they are just as easy to clone away as dust spots.
have a good day, Stefan van Hierden
 
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Buyantukhaa
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Joined: Thu May 13, 2004 5:33 am

RE: Help! Is My Camera Damaged?

Tue Feb 28, 2006 11:48 pm

Quoting Mikephotos (Reply 5):
For other wanting to test their cameras for dead/hot-pixels, here's a good link:

Thanks for the program! I just did some test shots:

So now I know they're not dead pixels, bot hot pixels, so they should mean trouble only at night or other strange circumstances. They're clustered in blocks.

TIFF JPG
ISO 64 28(8) 33(10)
ISO100 12(3) 12(3)
ISO200 12(3) 12(3)
ISO400 10(3) 10(3)
Number of pixels (number of distinct areas)

The strange thing is that at ISO400, several pics give different results, even though the settings are identical. The number varies from 28 to 45 in TIFF and from 9 to 10 in JPEG.
I scratch my head, therefore I am.
 
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Tonimr
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RE: Help! Is My Camera Damaged?

Wed Mar 01, 2006 4:05 am

Quoting JeffM (Reply 3):
You can't. Those pixels are stuck "on". It's not uncommon, I had on on my D100 after a week. Took it back. Have not had one show up on my Canon, but they are almost inevitable.

There's an utility to remove them, at least on the D100. I had one and was succesfully removed following some steps. I could send it to anyone who asks, but at his own risk...

Toni
There is a very fine line between 'hobby' and 'mental illness'.
 
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Buyantukhaa
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RE: Help! Is My Camera Damaged?

Wed Mar 01, 2006 4:36 am

Quoting Tonimr (Reply 8):
There's an utility to remove them, at least on the D100. I had one and was succesfully removed following some steps. I could send it to anyone who asks, but at his own risk...

Interesting! How does that work? Is it software or hardware?
I scratch my head, therefore I am.

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