For Sigma 40mm f/1.4 DG HSM Art Lens. Sigma 40mm f/1.4 DG HSM Art Lens. 1 x iShoot Tripod Mount Ring IS-SM40 for Sigma 40mm f/1.4 DG HSM Art Lens. Added the function of quick release plate. The length of the plate is about 70mm, with 1/4 and 3/8 screw holes and stainless steel anti-slip screws;.
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