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 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