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Dirt inside lens rear element - Fixable or new lens time?

Discussion in 'Photography & Video' started by No-One, Sep 30, 2018.

  1. No-One

    Wise Guy

    Joined: Oct 1, 2003

    Posts: 2,011

    Location: Rutland

    My Sigma 70-300 APO DG has got quite a lot of dirt on the inside of the rear element. It probably goes some way to explain which the quality of it is pretty poor (although I know this is a budget lens anyway). If I shine a torch from the front it's very visible.


    Does anyone have any idea if this is fixable or is it time to replace it? Obviously I not going to try and take it apart myself and the lens is about 8 years old so out of warranty.
  2. EGuitarStar

    Wise Guy

    Joined: Dec 23, 2009

    Posts: 2,427

    Location: Earth

    Depending on the cost of the lens it might be worth checking how much to get it cleaned, expect it to be at least £50, so given that you might be think about getting a replacement.
  3. D.P.


    Joined: Oct 18, 2002

    Posts: 29,354

    You can get that cleaned, but I would think the cost would make it prohibitive. The lens is just not very good on new sensors.
  4. No-One

    Wise Guy

    Joined: Oct 1, 2003

    Posts: 2,011

    Location: Rutland

    I have found it to be very soft and the focus not too reliable (even in live view) on my 70D. I had originally put it down to the dirt. I’m thinking of maybe splashing out on the Tamron 100-400 to replace it.
  5. Columbo


    Joined: Mar 26, 2007

    Posts: 8,171

    Location: Nottinghamshire

    Is cash is thin on the ground and for a cheap and cheerful replacement grab the Canon 55-250mm IS STM, its astonishingly sharp for sub £150.