Canon has filed a patent for a super-telephoto prime lens in Japan. The new patent describes the EF 600mm f/4 DO IS lens designed for full-frame Canon DSLRs.
It has a focal length of 600mm and a constant aperture of f/5.6. From the DO designation we understand the optic will have diffractive optical feature.
Canon lenses which feature the diffractive optical (DO) are smaller and lighter compared to the same focal length lenses but the price becomes generally higher when the lenses have optical formual for DO.
Canon Patent for EF 600mm f/4 DO IS USM Lens
The Japanese company has announced the EF 400mm f/4 DO IS II USM lens back in 2015. It is a powerful lens. The Canon EF 600mm f/4 DO IS USM lens we see in this application is expected to be announced in the second half of 2017. The optic will use an EF mount, and is compatible with the Canon EOS camera range.
- Patent publication number 2016-200685
- Release date 2016.12.1
- Application date 2015.4.9
- Example 1
- Focal length 585.00
- F number 4.12
- Half angle of view (degree) 2.12
- Image height 21.64
- Lens total length 335.32
- BF 66.92