red dots on picture


dennysuh

New Member
Jul 15, 2010
46
0
0
singapore
#1
When I took my picture @ marina bay last night, I saw the red dots on my picture. Btw I used the Hoya UV filter for my lens. I attached the photo for your easy checking. These red dots are only can see in the dark like night photography. May I know is this sensor or lens or filter problem? thanks.
 

spree86

Senior Member
Feb 3, 2009
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0
Bishan
www.flickr.com
#2
When I took my picture @ marina bay last night, I saw the red dots on my picture. Btw I used the Hoya UV filter for my lens. I attached the photo for your easy checking. These red dots are only can see in the dark like night photography. May I know is this sensor or lens or filter problem? thanks.
Can't see the photo, guessing it might be hot pixels but need to see pic to be sure.
 

May 23, 2010
11
0
0
#3
cant see the photo either but may be ghosting. i had the same problem with night photog. try taking off your UV filte and see if it helps?
 

dennysuh

New Member
Jul 15, 2010
46
0
0
singapore
#4
When I took my picture @ marina bay last night, I saw the red dots on my picture. Btw I used the Hoya UV filter for my lens. I attached the photo for your easy checking. These red dots are only can see in the dark like night photography. May I know is this sensor or lens or filter problem? thanks.
http://www.flickr.com/photos/54694723@N03/5064571607/
 

dennysuh

New Member
Jul 15, 2010
46
0
0
singapore
#7
Can't see the photo, guessing it might be hot pixels but need to see pic to be sure.
cant see the photo either but may be ghosting. i had the same problem with night photog. try taking off your UV filte and see if it helps?
Its a private photo, still can't view it
Sorry Guys. I try to upload the picture but still can't. I'll try again later. :sweat:
 

spree86

Senior Member
Feb 3, 2009
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Bishan
www.flickr.com
#11
Iso 200, f/22, shutter speed 30 and I used Hoya UV filter.
Hmm noise shouldn't be an issue at ISO 200, might be caused by your filter, you should remove your UV filter for long exposures and night shots to prevent any flaring or ghosting.
 

Rashkae

Senior Member
Nov 28, 2005
19,105
12
0
#12
Iso 200, f/22, shutter speed 30 and I used Hoya UV filter.
That's your issue right there. You're shooting at f/22, so your picture will be softer as it suffers from diffraction. The noise you're seeing is long-exposure ISO noise since you were at 30 seconds.

Try opening up to f/16 or even f/11 and adjust shutter speed accordingly, then try again. It's not a filter issue.
 

dennysuh

New Member
Jul 15, 2010
46
0
0
singapore
#13
That's your issue right there. You're shooting at f/22, so your picture will be softer as it suffers from diffraction. The noise you're seeing is long-exposure ISO noise since you were at 30 seconds.

Try opening up to f/16 or even f/11 and adjust shutter speed accordingly, then try again. It's not a filter issue.
Hmm noise shouldn't be an issue at ISO 200, might be caused by your filter, you should remove your UV filter for long exposures and night shots to prevent any flaring or ghosting.
Rashkae & spree86 thanks for your advices. Noted with thanks.:)
 

Rashkae

Senior Member
Nov 28, 2005
19,105
12
0
#15
I am sorry. I did not see any dots on your pictures.
Must pixel-peep to 100% then you see a little of the normal noise. I think ts is expecting 100% clean images without realizing you'll never get that.
 

Jackle

New Member
Mar 22, 2010
159
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0
#16
Some times if you see very pronounced red spots, they might be hot spots. I do get some after shooting long exposures and especially when using live view.
 

Rashkae

Senior Member
Nov 28, 2005
19,105
12
0
#19
hot pixels?? Shall I send it to Cannon for checking? My camera is still under warranty. Thanks.
It's normal with long exposures. It's generally not visible. Stop pixel peeping.
 

farbird

New Member
Jan 14, 2004
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0
41
www.farbird.com
#20
hot pixels can be cured..

set to manual cleaning with the body cap on without any lens attached..

let the mirror flip up and shutter opened for about 5-10mins... then turn the camera off..

best to do it in a dark area so no stray light enter via viewfinder or any other crevices.
 

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