Sigma 20mm f/1.4 Patent Spotted (and 23mmF1.4)

The patent for the Sigma 20mm f/1.4 lens (as well as 23mmF1.4) has been spotted by the Japanese website Asobinet here.

This is just a variation of what would ultimately become the Sigma 23mm f/1.4 DC DN, so there are close to zero chances that Sigma will release also the Sigma 20mm f/1.4.

List of Sigma APS-C Lens Patents

• Sigma 10mm F1.4
• Sigma 12mm F1.4
• Sigma 13mm f/2
• Sigma 14mm f/1.8
• Sigma 20mm f/1.4
• Sigma 18-50mm f/2
• Sigma 20mm f/1.4
• Sigma 50-135mm f/2.8
• Sigma 50-140mm f/2.8
• Tamron 13mm f/1.8
• Tamron 12-50mm f/4 VC
• Tamron 60mm f/2

Sigma X Mount Lenses

• Sigma 10-18mm f/2.8
  BHphoto / Amazon / Adorama
• Sigma 18-50mm f/2.8 DC DN
  BHphoto / Amazon / Adorama
• Sigma 100-400mm f/5.0-6.3 DG DN OS
  BHphoto / Amazon / Adorama
• Sigma 16mm f/1.4 DC DN
  BHphoto / AmazonUS / Adorama
• Sigma 23mm f/1.4 DC DN
  BHphoto / Amazon / Adorama
• Sigma 30mm f/1.4 DC DN
  BHphoto / AmazonUS / Adorama
• Sigma 56mm f/1.4 DC DN
  BHphoto / AmazonUS / Adorama

Patent Details

Example 1

• Focal length: 22.31
• F value: 1.46
• Angle of view: 67.85
• Statue height: 14.20
• Total length: 94.32
• Back focus: 18.7827

Example 3

• Focal length: 20.37
• F value: 1.43
• Half angle of view: 72.96
• Statue height: 14.20
• Total length: 94.32
• Back focus: 19.3592