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FORUMS Photography Talk by Genre Critique Corner
Thread started 14 Feb 2004 (Saturday) 01:01
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strange red/blue dots in night photos (canon digital rebel)

 
snorrish
Junior Member
25 posts
Joined Feb 2004
Feb 14, 2004 01:01 |  #1

Hi…I took some photos earlier this evening just to mess around with some night shots, and noticed that a few of them had some strange red and blue dots in them. Does anyone know what’s causing this (is it avoidable)?

The camera used is a Canon Digital Rebel, unknown settings.

IMAGE NOT FOUND IMAGE IS A REDIRECT OR MISSING!
http://www.planethalfl​ife.com ...hotos/small1_img_04​49.jpg (external link)
HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO

IMAGE NOT FOUND IMAGE IS A REDIRECT OR MISSING!
http://www.planethalfl​ife.com ...hotos/small2_img_04​49.jpg (external link)
HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO


Here's the original, it has been resized and compressed quite a bit so the colours of the dots aren't nearly as distinct.

http://www.planethalfl​ife.com/redef/photos/i​mg_0449.jpg (external link)

Also, here's another photo that i took, just in case anyone want to see another from the series:
IMAGE NOT FOUND IMAGE IS A REDIRECT OR MISSING!
http://www.planethalfl​ife.com ...photos/small_img_04​50.jpg (external link)
HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO

Original (resized and compressed):
http://www.planethalfl​ife.com/redef/photos/i​mg_0450.jpg (external link)


Thanks, any comments are appreciated!



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Radtech1
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Trantor
Feb 14, 2004 01:37 |  #2

Start by taking several images and look to see if the same colored dots are in the same spot (ie, upper-right quadrant, etc) on all the images. If that is the case, then you can at least narrow it down to a CMOS problem. If that is not it, then I am stumped.


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snorrish
THREAD ­ STARTER
Junior Member
25 posts
Joined Feb 2004
Feb 14, 2004 02:09 |  #3

the dots can be reproduced, and are in the same spots

here's another sample (intentionally black), full resolution lightly compressed:

http://www.planethalfl​ife.com/redef/photos/i​mg_0458.jpgexternal link




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EoSD30fReAk
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Netherlands
Feb 14, 2004 10:12 |  #4

Well it looks like you C-mos has some hot pixels!
if they don't bother you to much i would leave them but personaly i would send it to canon for repair.
i had it once with an Ixus V3, but that was just 1 hot pixel it was right in the middle of each photo ?! but you got 5!! if your camera is still under warrenty i would strongly reccomend you to send it in!!


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peter/c
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leicestershire Uk
Feb 14, 2004 14:28 |  #5

I also have a 300d (rebel).It tells You somewhere in the manaul, if My memory serves Me well,what percentage of 'Hot pixels' Canon accepts as permissible.Mine has only ever shown one and I believe it is only a problem with Long exposures. My advice would be either ring Canon for guidance or just 'clone' out the dots.


http://peterclarkson.s​mugmug.comexternal link

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KO_300D
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Sometimes Planet Earth
Feb 14, 2004 19:54 |  #6

Just before it goes back to Canon, if you choose that route, can I ask if you've changed lenses at all?
I'm thinking that very small water particles on the lens (possibly on the inside, the bit that contacts the camera) could cause this as water is known for it's colourful rays when contacted with white light.

I'd try another lens, and if the issue is still there, and you've cleaned the mirror screen inside (very gently!) then I'd go with the Canon service centre option.


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snorrish
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Junior Member
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Feb 14, 2004 23:22 |  #7

I don't have another lense to try :(

I have cleaned the lenses/mirror.

I may bring it in early next week...it isn't an enormous hassle (bring it to the store where i purchased it, as i also purchased an extended warranty)...but ill be without it for a month at least.




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