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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 25 Feb 2012 (Saturday) 11:32
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Dust/Flake in 50mm f1.0L

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Joined Mar 2011
Feb 25, 2012 11:32 |  #1

Friend of mine is willing to sell his 50mm f1.0L very cheap as he is moving to Nikon.
Price is very reasonable consireding used ones go around $5000 on Ebay.
Only problem is there is a dust. Not much actually one single flake on one of the elements inside. It is about 1 cm from the side, since it is a HUGE glass that dust flake is strikingly visible when you look at it.
I can not see anything from the viewfinder, and I did couple of test shots with 5D and did not see any dust or flake reflected on my images.
He gave me the lens for a week to evaluate before buying, is there any circumstances I can try to reflect that dust/flake on the image? Such as wide open? Shoot at f11 or higher? Shoot a sky? White paper? etc?
I just want to see if it will be visible in some conditions and if it is that will possible lower the selling price :D

Ali Engin Photography (external link)

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Joined Jan 2008
Location: houston, tx
Feb 25, 2012 11:35 |  #2

it will show up in all the pics... i will buy it from you cheap though. ill just clone it out every time.

but to answer your question it won't show up... even stopped down you probably won't see it at all

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Feb 25, 2012 11:42 |  #3

http://www.lensrentals​.com …e-apocalypse-of-lens-dust (external link)

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Cream of the Crop
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Feb 25, 2012 11:45 |  #4

As previous response says (in the second line)....

That "flake" inside the lens won't show up much in images.... You might get a shadow from it at really small apertures. Of course, that's sort of the opposite reason for buying an f1.0 lens... they're usually not used at small apertures.

You also might see some flare from the flake, in extreme light situations.

However, it could be cleaned out.

I'd be more worried about where that flake came from. I recently looked at a bargain priced camera that had what appeared to be a lovely, fast Vario Leitz lens on it... But on close examination I saw that there were some flakes inside the front of the lens... They were coatings coming off one or more of the internal elements. Pretty much ruined the lens. So I passed, even though the price was attractive.

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happy with myself for not saying anything stupid
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Feb 25, 2012 13:38 |  #5

just so you know...the prices listed on ebay aren't what they sell for, it's what people are asking...they could ask a million dollars that doesn't make them that valuable if they're not getting it...

they sell on ebay for about $3,000-$3,500

Andre or Dre
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Feb 25, 2012 20:14 |  #6

It depends if it is closer to the front element or the back element. It will have a much higher impact if it is toward the back.
Edit: I read the speck was 1cmon its side... reading again it is located at 1cm for the edge.(Correct ?) If it is in fact dust there is nothing to worry about and it will not show up.


"Holy crap its long!"
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Feb 25, 2012 21:03 |  #7

You probubly wont see ever... Especially not at f/1.0​dirty_lens_articleid35​.html (external link)

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Joined Jun 2009
Location: Boston, MA, USA
Feb 25, 2012 21:44 |  #8

I heard Canon will clean it for a fair price and adjust it while they at it, too.

My imagine composition sucks. I need a heavier lens.

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Dust/Flake in 50mm f1.0L
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