Tamron 135mm F2.8 VC Lens Patent for APS-C Cameras

Egami spotted a new patent filed by Tamron. The new patent is for a telephoto lens and named as Tamron 135mm F2.8 VC.

This lens features 135mm focal length, f/2.8 maximum aperture and designed for APS-C sensor cameras. Below are the details for the new Tamron 135mm F2.8 VC lens patent.

Tamron-135mm-f2.8-VC-lens

Tamron 135mm F2.8 VC Lens Patent for APS-C Cameras

Description and self-interpretation of the patent literature (Google Translated)
  • Patent Publication No. 2013-97212
    • Publication date 2013.5.20
    • Filing date 2011.11.1
  • Example 1
    • Focal length f = 133.00mm
    • Fno. 2.86
    • Angle of view 2ω = 12.1 °
    • Telephoto ratio 0.752
    • Image height Y = 14.2mm
    • The effective diameter of the front lens 23.50mm
  • Tamron patents
    • 3-unit construction of positive and negative negative
    • Inner Focus (the second group)
    • (Part of the third group) correction to shake

via: EG