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400D ERR99 with new lens.

Started May 18, 2019 | Questions thread
Lemming51
Lemming51 Forum Pro • Posts: 15,278
Re: 400D ERR99 with new lens.

davecac wrote:

After testing on various settings it looks like the camera will not communicate with the lens to close the aperture. It will work on fully open and manual on the camera but otherwise err99 . I take it it’s not compatible ? Cac

Yes, that's the typical behavior of the old non-compatible Sigma lenses.

Generally, Sigma lenses designed/made prior to 2002 have this incompatibility with Canon EOS bodies released 2002 and later, both film and digital. Older models "DL" or no "D-" designation are often incompatible.  Sigma lenses with "DG" or "DC" are later models for digital that are better reverse engineered and should be fine.

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