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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 24 Feb 2012 (Friday) 01:10
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Potential DIY Sigma Front/Back Focus Repair

 
Jigglypuff
Member
101 posts
Joined Oct 2009
     
Feb 24, 2012 01:10 |  #1

FYI

There's an old Sigma 24-70 f/2.8 EX DG Macro (nikon F-mount) at my workplace whose focus jammed recently. I took it home to repair and discovered that it might potentially be really easy to fix front or back focus issues. The lens is only used in manual focus and I'm too lazy to do a thorough study, but I wanted to pass along the information for anyone who's brave enough to validate the method on their own. As usual, DO THIS AT YOUR OWN RISK.

1. Apply downward pressure on the Sigma label near the front element and rotate counter-clockwise. Pretend like you're trying to remove a filter.

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2. This is what'll pop off. It seriously threads on just like a filter.
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3. Loosen the three screws seen here (note: only loosen the screws that have the adjustment slots to the left/right). The way it's set up, rotating the front element will make it shift forward/backward ever so slightly.
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4. Lightly tighten the screws and take a picture. Repeat until focus is where you want it to be.



  
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Xcelx
Senior Member
558 posts
Joined Sep 2009
     
Feb 24, 2012 01:25 |  #2

Are you sure that's for front back focusing? The Canon 17-55mm has the same front element adjustment screws but that's only for infinity focus adjustments AFAIK. Could be different with the Sigma though :)




  
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Potential DIY Sigma Front/Back Focus Repair
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
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