The Sigma 21-35 mm f/ 3.5-4.2 Lens. Specs. MTF Charts. User Reviews.
Sigma GP-21 Guide Plate for 20mm f/1.4 DG DN Art Lens 414T69 B&H
Amazon.com : Sigma MC-21 Adaptor for Sigma SA to Leica L-Mount : Electronics
Amazon.com : Sigma MC-21 Adaptor for Sigma SA to Leica L-Mount : Electronics
Sigma 21-35mm f3.5 - 4.2 vintage film camera lens. First impressions - YouTube
AF Supply | Geberit 115.884.SI.1 Sigma21 Dual-Flush Plates for Sigma Series In-Wall Toilet Systems, White Glass with Polished Chrome Accent Finish | AF Supply