Dear Nikon D780 users

Thank you for purchasing and using our products.

We have found that some SIGMA lenses for Nikon are not fully compatible with the Nikon D780. When certain lenses are attached to the camera the below phenomenon will occur.
Note: We can confirm that there are no known issues for the general operation of current products other than the concerned lenses listed below.

[Products concerned]
SIGMA 8mm F3.5 EX DG CIRCULAR FISHEYE
SIGMA 15mm F2.8 EX DG DIAGONAL FISHEYE

[Phenomenon]
AF operation may not be stable
 
[Customer support]
Customers who use the products concerned are able to receive free firmware updates at their nearest authorized SIGMA subsidiary / distributor.

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.