Sigma says some of its lenses may have a potential aperture operation problem when used with the Sony A33 and A55 “SLT” cameras. Those camera owners who experience this issue are encouraged to contact the a Sigma Service Station for a free lens modification. Note that for lenses discontinued several years ago, a modification may not be available. Future batches of Sigma lenses for the Sony A mount will be fully compatible with these cameras, the manufacturer says.

Sigma Press Release

Notice to Sony ?33 and ?55 owners using Sigma’s Sony fit lenses
2010.9.10

Sigma’s lenses for Sony mount may have a potential aperture operation problem when used with the Sony ?33 and ?55 Interchangeable Lens digital cameras.

To overcome this issue, we will be offering, free of charge, a modification service to our customers who have purchased a Sony ?33 and ?55 and own Sigma lenses for Sony mount.
This phenomenon will only occur with Sony ?33 and ?55 cameras. Future production of Sigma lenses will be fully compatible with these cameras.

We deeply apologize for any inconvenience caused to our customers.

[Phenomenon]

When shooting with a Sony ?33 and ?55 cameras, the aperture may not work properly and a “camera error” message will be displayed on the camera.

[Lenses requiring the modification]

All current Sigma’s lenses for Sony mount.

* For lenses discontinued several years ago, a modification may not be available. For further details, please contact your nearest authorized Sigma Service Station.

[Support for this issue]

We will be offering a modification service for our current range of lenses free of charge. Please contact your nearest authorized Sigma Service Station.
World Network

[Mark for compatible lenses]

Future production of Sigma lenses will be compatible with these cameras. The following sticker is put on the gift box of compatible lenses.

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