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05-08-2012, 04:38 PM   #1
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K-5 - Mark in photos when stopped down

Hi forum,

I am running into a strange problem I hope someone can help me with. Didn't see a solution on the internet anywhere.

I was recently going through my photos on a bright day, and noticed a weird L shaped mark on all my photos when my lens was stopped down. Thinking it was my lens, I did some tests and noticed that it is in ALL photos in the same place, regardless of focal length, leading me to believe it's my camera. I don't see anything in my view finder, and the mark gets less sharp as I open the aperture up and is essentially gone by f5.

The example is circled in red below with a photo at f22. The other is at f2.8. Could this be a dirty sensor? I don't really wanna touch it unless that is the problem

Thanks guys

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05-08-2012, 04:41 PM   #2

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Yeah, on the sensor. Or, if only one lens does it, small chance it is something on the rear element.
05-08-2012, 04:42 PM   #3
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Yes. It's dust on your sensor.

And from the size of it, it's a nice big piece of dust. Which is also supported by the fact that you see it up till f5. Being that big, a blower like the Rocket Blowers would have no problem removing it.
05-08-2012, 04:50 PM   #4
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Indeed, this is what you need:
Giottos Rocket Air Blaster, Manual Air Blower with Bulb AA1900

It also does an excellent job of cleaning your keyboard.

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05-08-2012, 08:08 PM   #5
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Original Poster

I actually can see it looking closely at the sensor.

Thanks for the quick reply guys!

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