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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 01 Apr 2008 (Tuesday) 22:41
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Is my sensor dirty?

 
miller00
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Apr 01, 2008 22:41 |  #1

I can't tell if the white spots are from dust or something else? Help Please!

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poloman
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Apr 01, 2008 22:57 |  #2

Yes... I think your sensor is dirty.
You may also have UFOs at your place. :)
The white spots look like dried liquid on your sensor.


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Rubi ­ Jane
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Apr 01, 2008 22:58 |  #3

You sensor is dirty. Clean it and see if the white spots go away.


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Zonieart
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Apr 01, 2008 23:49 |  #4

Lots of dust. It needs a good hit from a rocket blower.


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Glenn ­ NK
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Apr 02, 2008 00:14 |  #5

Umm, actually it's filthy.;)


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miller00
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Apr 02, 2008 01:37 |  #6

Okay I just wanted to make sure, because I have only ever had dark spots..




  
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PhotosGuy
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Apr 02, 2008 09:34 |  #7

I don't think so. EXIF:
# Lens F-Number/F-Stop = 5/1 = F5
# Flash = Flash fired, compulsory flash mode

f/5 shouldn't be enough to show dust bunnies. Your flash is lighting dust in the air.

Some personal views on Sensor cleaning.


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Glenn ­ NK
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Apr 02, 2008 10:14 |  #8

There are at least seven black blobs which seem to be dust.

I wonder if they would show up at f/16?


When did voluptuous become voluminous?

  
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ThomasOwenM
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Apr 02, 2008 11:26 |  #9

PhotosGuy wrote in post #5244726 (external link)
I don't think so. EXIF:
# Lens F-Number/F-Stop = 5/1 = F5
# Flash = Flash fired, compulsory flash mode

f/5 shouldn't be enough to show dust bunnies. Your flash is lighting dust in the air.

Some personal views on Sensor cleaning.

I agree, f/5 isn't narrow enough to show you your dust. Take another shot with your aperture as narrow as your lens permits. If you have a choice of lenses, use the one that goes narrowest. f/20 or 22 works great if your lens will do it. Then use manual focus and take an out of focus shot of a plain blank screen (an empty Word document at full screen works great). Then clean your sensor and take the same type of shot again so that you can see if you got all the dust.

If you've been shooting for a while without cleaning your sensor, you almost certainly have some dust, especially if you've changed lenses.


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Cody21
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Apr 02, 2008 14:40 |  #10

I simply just aim my lens to the open blue (or overcast) sky and shut my aperture down to f/22 or f/36 ... any dirt on my sensor is soooo apparent. If I shoot at say f/4 (wide open), as Frank indicated, I don't see the issues as much. I have a Sensor cleaning "kit" arriving today. Will start with the rocket blower, check it again. Go to the static-charged brush, check again. And if necessary, the 'liquid solution & pad', and check again.


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primoz
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Apr 02, 2008 15:00 |  #11

Nah... just auto focus doesn't work. These are out of focus sea gulls flying around :)
Ok seriously.... yes it's dirty. Since it's shoot at f5.0, then it's pretty bad... (same problem from week ago, and I noticed it too late (external link)). If it would be shoot at f22, then it would be critical. But in your case... clean it.


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primoz
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Apr 02, 2008 15:03 as a reply to  @ PhotosGuy's post |  #12

This should be some helluva dusty place then :) You can't really see normal dust in air this way... even with flash. But on the other side... I had "nice" snowflakes once shooting sport climbing with flash, when there was bunch of magnesium in the air. But there was so much of it in air, you could actually see it. I don't think something like this would be possible outside. But I can be wrong :)


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Cody21
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Apr 02, 2008 15:21 |  #13

primoz wrote in post #5246449 (external link)
If it would be shoot at f22, then it wouldn't be that critical.

This is not my experience. When I shut down my aperture to f/22 - or f/36, the "dirt" becomes much clearer in my pictures. When I open it up to f/5 or f/4, it blurs the dirt more and it is less obvious. I just tested this and that's what I'm seeing.


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Bill ­ Roberts
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Apr 02, 2008 15:23 |  #14

Have you got another shot showing the "dust" in the same place? That would at least tie it down to either a dirty sensor or airborne particles. If it was airborn it's unlikely to be in *exactly* the same place, if it is then it's much more likely to be on the sensor.


BiLL

  
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primoz
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Apr 03, 2008 00:50 as a reply to  @ Cody21's post |  #15

Eh sorry... I meant to write it would be critical, not it wouldn't be. Sorry and I fixed it :) With f22 dirt is more visible not less.


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Is my sensor dirty?
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