400mm F5.6 reflex-mirror lens with an electrochromic ND filter from CANON [Patent]
CANON filed patent of 400mm F5.6 reflex-mirror lens with an electrochromic ND filter for APS-C DSLR camera.
【公開番号】特開2017-219642(P2017-219642A) click here
【公開日】平成29年12月14日(2017.12.14)
【発明の名称】反射屈折光学系及びそれを有する撮像装置
Specification and lens arrangement of embodiment 1
Focal length: 400 mm
F No.: 5.6
2ω: 1.96
Image height: 13.66 mm
Back focus: 33.07 mm
Lens length: 247.73 mm
* OC is an electrochromic ND filter.
【公開番号】特開2017-219642(P2017-219642A) click here
【公開日】平成29年12月14日(2017.12.14)
【発明の名称】反射屈折光学系及びそれを有する撮像装置
Specification and lens arrangement of embodiment 1
Focal length: 400 mm
F No.: 5.6
2ω: 1.96
Image height: 13.66 mm
Back focus: 33.07 mm
Lens length: 247.73 mm
* OC is an electrochromic ND filter.
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