Operating conditions of the SIGMA 35mm F1.2 DG DN | Art for SONY E-mount with the SONY α7RIII / α7R IV


Thank you for purchasing and using our products.

We would like to share the results of our investigation regarding the operation of the SIGMA 35mm F1.2 DG DN | Art, when used on the SONY α7RIII / α7R IV.

[Applicable products]
SIGMA 35mm F1.2 DG DN | Art for SONY E-mount

[Confirmed phenomenon]
The focus may not work on α7R III / α7R IV depending on the shooting distance when the focus mode is set to ‘AF-C’ with an aperture value of F1.2.

We are planning a firmware update to address this issue, which will be announced in due course.

This phenomenon does not occur in the following conditions.
・When used on cameras other than Sony α7R III / α7R IV
・When shooting movies

We apologize for any inconvenience caused to customers using this product combination. Please avoid using focus mode “AF-C” when aperture value F1.2 is selected until the firmware update is released.

We appreciate your continued support for our company and products.