Yes, it features a dust and splash-proof structure with a rubber seal at the mount, making it suitable for professional use in unpredictable outdoor conditions.
Yes, the E-mount version of the Sigma 85mm f/1.4 DG DN Art is fully compatible with the Sony A7IV and all other Sony E-mount mirrorless cameras.
Absolutely. It features a de-clickable aperture ring for smooth exposure transitions and a quiet stepping motor that minimizes focus noise during filming.
The lens uses a standard 77mm front filter thread, compatible with most professional ND and CPL filters.