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FORUMS Cameras, Lenses & Accessories Small Compact Digitals by Canon 
Thread started 18 Dec 2018 (Tuesday) 18:01
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Hair on lens, how to get rid of?

 
fuzmaster
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Dec 18, 2018 18:01 |  #1

So I have a 18mm - 55mm lens from Canon to fit my t3i, and for some reason, theres a hair on near the top right corner. Even when going at the certain lens, I still see. I tried cleaning the lens with a cloth and still it. How would I get rid of it?

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Left ­ Handed ­ Brisket
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Dec 18, 2018 19:00 |  #2

i kinda told myself i would stop saying "OP's handle checks out!"

but fuzmaster ? ? ? way to easy. lol

looks like there is some on the left too. Are you certain it's on the lens and not the sensor?

if you take a small pen light (flashlight/torch etc) and shine it through the lens, with it off the camera, you should be able to pin point where the fuzz is.


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Tom ­ Reichner
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Dec 18, 2018 19:22 |  #3

Left Handed Brisket wrote in post #18773664 (external link)
.
Are you certain it's on the lens and not the sensor?
.

.
That's what I wondered, too.

I don't know why fuzmaster thinks that is on the lens; it sure doesn't look like it would if it were on the lens. . It looks exactly what it would look like if it were on the sensor or caught up in the mirror box somewhere right in front of the sensor.

Fuzz, if you take a rocket blower and blow out your mirror box and sensor, I think this 'hair' will disappear from your images. . As far as I can tell, it has nothing to do with your lens.


.


"Your" and "you're" are different words with completely different meanings - please use the correct one.
"They're", "their", and "there" are different words with completely different meanings - please use the correct one.
"Fare" and "fair" are different words with completely different meanings - please use the correct one. The proper expression is "moot point", NOT "mute point".

  
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gjl711
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Dec 18, 2018 19:49 |  #4

I'm guessing it's on the sensor as well.

OP, if you want to make sure try this.

Take a picture of some uniformly colored, well lit surface. The sky works well as does a blank word document on you screen.
Take the image as out of focus as possible. If shooting the sky, set the focus to the minimum focus distance. If shooting you computer monitor, set the focus to infinity.
Set the f-stop to the lens max but anything over f/22 works well. Set the ISO to ISO 100 and set the shutter speed so that the image is properly exposed.
When taking the picture, moving the camera around helps make things even blurrier so no need to keep things stable. The blurrier, the better.

What you will get is a horrible out of focus image but properly exposed. The only thing that will be anywhere near in focus will be dust/grime/pollen/hair​s which are sitting on top of the sensor.

If you really want to shock yourself, import the image into something like Photoshop and play with the levers and curves and you can make the dust speck literally pop out.


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davesrose
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Dec 20, 2018 19:54 |  #5

Yes, that the spots have a shape probably means sensor. Dust on lens doesn't show up since rays of light focus beyond the end of the lens (some POTN members have even proven the point by taking photos of pieces of tape on a lens). Newer cameras have an automatic cleaning feature in which the camera shakes the sensor a bit to settle dust out. I've found it's enough for me. For my first DSLR that didn't have this feature, I would go into self cleaning mode (the camera opens the shutter). You can then point the shutter downwards and use a rocketblower to try blowing any dust out. You can also get a wet sensor cleaning kit.


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Hair on lens, how to get rid of?
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