Thank you for purchasing and using our products.
We would like to share 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.
Note:
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.
For further information, please contact your nearest authorized SIGMA subsidiary / distributor.
https://www.sigma-global.com/en/about/world-network/
We appreciate your continued support for our company and products.