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
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)