Effects of axial and radial gradients on Cooke triplets.
This study investigates the role of gradient-index materials in the design of Cooke triplets for use as 35-mm format photographic objectives. Cooke triplet designs are presented with different types of gradient-index profiles. Both linear axial and shallow radial gradients are shown to provide effective control of spherical aberration and astigmatism. In particular, a Cooke triplet with a combination of both linear axial and radial gradients attains performance comparable to a six-element double Gauss lens. In virtually all cases, the use of gradient-index components improves the Cooke triplets' performance significantly.
Blough
C G
CG
Bowen
J P
JP
Haun
N
N
Kindred
D S
DS
Koshel
R J
RJ
Krill
D M
DM
Moore
D T
DT
Saxer
C E
CE
Wang
D Y
DY