This SIGMA lens has a maximum focal length of 85 mm and a minimum focusing distance of 0.85 m. Your filters need to have a diameter of 77 mm to fit this lens.
From London Camera Exchange
Sigma 85mm f/1.4 DG DN ART - For Sony FE mount
Camera Centre
Sigma 85mm f1.4 Art Series DG DN Lens - Sony FE Mount - A GRADE
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