Tamron Patent for 15-50mm f/1.4 Lens

Egami spotted a new patent filed by Tamron in Japan. New patent describes a Tamron 15-50mm f/1.4 lens made for 1/1.7 inch sensor cameras.

Tamron 15-50mm f/1.4 lens will be equivalent to 70-233mm in size conversion.The lens design includes 12 pieces in 9 groups. See patent details below.

Tamron Patent for 15-50mm f/1.4 Lens

Description and self-interpretation of the patent literature

• Patent Publication No. 2014-56055
  • Publication date 2014.3.27
  • Filing date 2012.9.1
• Example 1
  • Focal length f = 15.0-27.4-50.0mm
  • Fno. = 1.41
  • Half angle ω = 17.31-9.28-5.00 °
  • 5-group zoom of positive and negative ShiboTadashi positive and negative
  • Inner zoom
  • Inner Focus (Group 4)

via EG