Sony Patent for 250mm f/4.5 APS-C E-mount Mirror Lens

Egami has discovered a new patent filed by Sony. The new patent describes a mirror lens having a focal length of 250mm and f/4.5 aperture.

The newly patented Sony 250mm f/4.5 lens is designed for APS-C E-mount cameras. From the patent details we can see that the lens is going to feature a built-in image stabilization.

Sony currently has long zooms like the new 70-200mm f/4 OSS G and 55-210mm f/3.5-5.6 OSS lens. Also a manual lens from Albinar 300mm f/6.3 is available for E-mount cameras. See the patent details below.

Sony Patent for 250mm f/4.5 APS-C E-mount Mirror Lens

sony-250mm-f4-5-patent

Description and self-interpretation of the patent literature

  • Patent Publication No. 2014-74783
    • Publication date 2014.4.24
    • Filing date 2012.10.4
  • Example 1
    • Fno. 4.67044-4.59954-4.51836
    • Focal length f = 256.875-248.739-241.35mm
    • Half angle ω = 3.05013-3.11606-3.15609
  • Sony patents
    • Inner Focus (group 2)
    • Anti-vibration (Group 3)

via EG