see also:

• Canon EF lenses
• Sigma 12-24mm f/4 DG HSM Art full frame lens
• Sigma 18-35mm f/1.8 DG HSM Art APS-C/DX lens
• Sigma 24mm f/1.4 DG HSM Art full frame lens
• Sigma 24-35mm f/2 DG HSM Art full frame lens
• Sigma 35mm f/1.4 DG HSM Art full frame lens
• Sigma 50-100mm f/1.8 DG HSM Art APS-C/DX lens
• Sigma 85mm f/1.4 DG HSM Art full frame lens

• unique 50-100mm f/1.8 APS-C/DX AF zoom lens in various mounts
• announced Feb 2016

• 50-100mm f/1.8 APS-C/DX AF zoom lens

• https://www.ephotozine.com/article/sigma-50-100mm-f-1-8-dc-hsm-art-review-29807
• https://www.dpreview.com/samples/7424715333/cream-of-the-crop-sigma-50-100mm-f1-8-real-world-samples
• https://www.dxomark.com/Reviews/Sigma-50-100mm-f-1.8-DC-HSM-A-Canon-lens-review