Canon 17-40 L : whats on my lens?

Discussion in 'Photography Equipment & Products' started by n3vo, Dec 16, 2015.

  1. n3vo

    n3vo TPF Noob!

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    Hi guys,

    New the forums here, I am not sure if this is the right place to post this. I recently bought my first L series lens used on ebay. I noticed something on the top of the glass and wasnt sure what it was. Looks almost like its peeling? is this something I should worry about or no?

    Thanks!

    Neil

    IMG_2022.JPG


     
  2. snowbear

    snowbear . Staff Member Supporting Member

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    Boogers?

    Looks like on of the coatings. You may not notice any difference but try it out at various focal lengths and apertures. If you see some odd lighting along the edge, leave a bit of space to crop.
     
  3. beagle100

    beagle100 Been spending a lot of time on here!

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    does it affect the photo? if not I wouldn't worry
    (but I don't buy lens on ebay)
     
  4. tirediron

    tirediron Watch the Birdy! Staff Member Supporting Member

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    That looks to me like it could be element delamination; that is, two elements which are cemented together, are now separating. This may have little to no affect on your images, HOWEVER, if it is in fact delamination, then it could continue until the point the elements completely separate. If you can, return the lens, if not swing by a repair shop and get their take.
     
  5. jcdeboever

    jcdeboever TPF Supporters Supporting Member

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    It looks like lens separation. Return it. Did they describe it in item description? I hate eBay

    Sent from my XT1254 using Tapatalk
     
  6. beagle100

    beagle100 Been spending a lot of time on here!

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    "lens separation" sounds (and looks) bad
    I hope the OP was able to return it
     
  7. dxqcanada

    dxqcanada Been spending a lot of time on here!

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    It appears that the front element is a single lens element.
    Canon EF 17-40mm f/4L USM
    ... so it is the front coating that is separating from the lens ?
     

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