Red Dot in Pictures

Davyb

Davyb

Davyb

Associate
Joined
10 Jan 2003
Posts
665
Location
Belfast NI
Was out with the camera this evening and i have notcied a red dot on most of the pictures with a black background.

Would this be a dead pixel or is it the Lens ?

The camera is less than a week old so should it be returned ?

Any help would be great.

sample image.

The red dot is just to the right of the clouds.

6281359020_1849c06677_b.jpg
 
Yep, just run the noise reduction pass on the camera and it should automatically be fixed for the rest of your shots. How you do that obviously depends on the camera.
 
Perfectly normal on a Long exposure shot. The pixel isn't dead, its a 'hot' pixel. It has basically received a greater 'amount' of energy than those around it. When you're taking long exposures the sensor can warm up - there a millions of pixels and although they're constructed to certain tolerances, they're not all perfect.

If you've got a Canon Camera there is usually a setting within the Camera to turn Long exposure noise reduction to ON. That usually does the trick.
 
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I have a Canon Ixus 90 and i get a red dot in the same place on everyone of my pics. It appears on screen and if i copy the image to my PC. I'm sure it appears when i record video as well.
 
Beerbaron said:
I have a Canon Ixus 90 and i get a red dot in the same place on everyone of my pics. It appears on screen and if i copy the image to my PC. I'm sure it appears when i record video as well.
Click to expand...

You most likely have a dead pixel on your sensor then.
 
Davyb - I haven't got much to add regarding the red dots but I looked at the picture and was like "I know that place!". That be the Lagan and The Queen's Bridge? Then saw your location. :)

Blackvault
 
If you also shoot RAW, software like Aperture or Lightroom is likely to remove a hot pixel before you come to edit it.
 
Canon approaches the hot pixel issue by keeping the mirror and/or sensor shutter closed and taking a second exposure from the sensor based on the timing of the original image.
Thus, if you take a 30 second exposure with LENR on it will take 60 seconds before the camera becomes fully operational again.
 
BloodyL said:
Canon approaches the hot pixel issue by keeping the mirror and/or sensor shutter closed and taking a second exposure from the sensor based on the timing of the original image.
Thus, if you take a 30 second exposure with LENR on it will take 60 seconds before the camera becomes fully operational again.
Click to expand...

I actually didn't know that was how it worked!

Thanks!
 
BloodyL said:
Canon approaches the hot pixel issue by keeping the mirror and/or sensor shutter closed and taking a second exposure from the sensor based on the timing of the original image.
Thus, if you take a 30 second exposure with LENR on it will take 60 seconds before the camera becomes fully operational again.
Click to expand...

ahh thats intresting.

i will have to try this out tonight.

Thanks
 
BloodyL said:
Canon approaches the hot pixel issue by keeping the mirror and/or sensor shutter closed and taking a second exposure from the sensor based on the timing of the original image.
Thus, if you take a 30 second exposure with LENR on it will take 60 seconds before the camera becomes fully operational again.
Click to expand...

Ah! Wondered why it did that! (Panny GF1 here) Thanks!
 
I must say, i really like that shot. Making me turn my attentions to the Canon 1100d now! What type of lense is that? are the lenses that come in the kits actually any good or would it be worth buying lense only and getting another lense?
 
That was taken with the kit lense.

I will be upgrading the lense when i have the cash to go along with my Tamron 70-300mm but for now the kit lense will do me.
 
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