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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 20 Dec 2011 (Tuesday) 11:52
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Dust in a lens

 
Bobct1
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Dec 20, 2011 11:52 |  #1

I am looking at buying a used lens... what is acceptable as far a dust in a lens goes? At what point does it affect image quality?




  
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bpark42
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Dec 20, 2011 12:00 |  #2

I rarely worry about dust when considering a used lens since it is pretty rare that it will have any visible impact on your shots. If you are asking because you are looking at a lens that seems to have a lot of internal dust, you may want to make sure it really is just dust vs. fungus.




  
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Capeachy
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Dec 20, 2011 12:00 |  #3

If you see dust in the image, then it begins to affect IQ :) Bring a laptop to zoom in and see the image? I've done that before too.

The closer the dust is to the sensor, the more likely it will affect the image.


Photography is the art of exclusion

  
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ejenner
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Dec 20, 2011 12:40 as a reply to  @ Capeachy's post |  #4

Been talked about a lot, but basically if it is lots of small particles it shouldn't have any effect. If it is large lumps (relative I know, but you can probably imagine) or actually laying a coating on one of the elements, probably not good.

If you can get the lens in your hands then it is likley that if you think, Hmm there's a lot of dust in there, then it's no problem. If you look in and you think 'Aggg' that looks like I wouldn't be able to shine a flashlight though it, then it is probably not good.

Canon will clean a lens (and check it) for about $200, so that might be an option for an expensive lens.

Also check out http://www.lensrentals​.com …0/front-element-scratches (external link). not dust, but may put it in perspective. Somewhere on that site is also a 'sort of dust test' too.


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kfreels
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Dec 20, 2011 13:28 as a reply to  @ ejenner's post |  #5

It's not uncommon for brand new lenses worth thousands of dollars to have a few specks of dust in it. Some lens manuals even state that this is a normal byproduct of the manufacturing process and should not affect image quality.


I am serious....and don't call me Shirley.
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Dust in a lens
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