Telephoto lenses with a phase fresnel optical element from NIKON

NIKON filed a patent of telephoto lenses with a phase fresnel optical element.

【公開番号】特開2018-17857(P2018-17857A) click here
【公開日】平成30年2月1日(2018.2.1)
【発明の名称】光学系、光学機器及び光学系の製造方法

Specification and lens arrangement of embodiment 1
ｆ = 391.74403 mm
ＦＮｏ = 5.76593
ω = 3.12480
ＴＬ = 229.99999 mm
Y = 21.6 mm


Specification and lens arrangement of embodiment 2
ｆ = 489.70405 mm
ＦＮｏ = 5.75019
ω = 2.51062
ＴＬ = 279.32422 mm
Y = 21.6 mm


Specification and lens arrangement of embodiment 5
ｆ = 587.82207 mm
ＦＮｏ = 5.88304
ω = 2.51193
ＴＬ = 334.33637 mm
Y = 21.6 mm


In all figures, GD is the surface with a phase fresnel optical element.