Cooke Triplet

50-mm f/4.5 Cooke triplet with 20^o half field of view. This is a CodeV example lens.

      Cooke Triplet f/4.5
                 RDY             THI     RMD       GLA           CCY   THC   GLC
   OBJ:        INFINITY        INFINITY                          100   100
     1:        21.48138        2.000000       SK16_SCHOTT        100   100
     2:      -124.10000        5.260000                          100   100
   STO:       -19.10000        1.250000       F4_HOYA            100   100
     4:        22.00000        4.690000                          100   100
     5:       328.90000        2.250000       SK16_SCHOTT        100   100
     6:       -16.70000       43.050484                          100   PIM
   IMG:        INFINITY        0.028933                          100     0
  
 SPECIFICATION DATA
    FNO        4.50000
    DIM             MM
    WL          656.30    546.10    486.10
    REF              2
    WTW              1         2         1
    INI            ORA
    XAN        0.00000       0.00000       0.00000
    YAN        0.00000      14.00000      20.00000
    VUY        0.00000      -0.01406       0.16171
    VLY        0.00000       0.06883       0.24355
  
 APERTURE DATA/EDGE DEFINITIONS
    CA
    CIR S1                   7.000000
    CIR S5                   6.500000
  
 REFRACTIVE INDICES
     GLASS CODE                    656.30       546.10       486.10
    SK16_SCHOTT                  1.617271     1.622861     1.627559
    F4_HOYA                      1.611640     1.620577     1.628487
  
 SOLVES
    PIM
  
 No pickups defined in system
  
  
 INFINITE CONJUGATES
    EFL        50.0004
    BFL        43.0505
    FFL       -39.5680
    FNO         4.5000
    IMG DIS    43.0794
    OAL        15.4500
    PARAXIAL IMAGE
     HT        18.1986
    ANG        20.0000
    ENTRANCE PUPIL
     DIA       11.1112
     THI        8.2156
    EXIT PUPIL
     DIA       11.6267
     THI       -9.2694

Ray Aberration Plot

Field Curvature/Distortion

Details in listing.

Diffraction MTF

Details in listing. See also CodeV MTF.

Spot Diagram

Field Angle
(degrees) X_c Y_c RMS spot
diameter

1 0 0.00000 0.00000 0.00811 mm

2 14 0.00000 -0.0057357 0.04576 mm

3 20 0.00000 0.00087688 0.03947 mm

Field	Angle (degrees)	Y_c	RMS spot diameter
1	0	0.00000	0.00811 mm
2	14	-0.0057357	0.04576 mm
3	20	0.00087688	0.03947 mm

(X_c, Y_c) is the displacement of centroid from chief ray.

The scale factor has been set such that one inch represents 0.05000 MM

Through-Focus Spot Diagram

Field Angle
(degrees) RMS spot diameter (mm)

1 0 0.15834 0.07965 0.00811 0.078975 0.15766

2 14 0.17572 0.10232 0.04576 0.075831 0.14642

3 20 0.14642 0.06807 0.03947 0.091723 0.15874

Focal Shift -1.00 -0.50 0.00 0.50 1.00

Field	Angle (degrees)	RMS spot diameter (mm)
1	0	0.15834	0.07965	0.00811	0.078975	0.15766
2	14	0.17572	0.10232	0.04576	0.075831	0.14642
3	20	0.14642	0.06807	0.03947	0.091723	0.15874
Focal Shift	-1.00	-0.50	0.00	0.50	1.00

Maintained by John Loomis, last updated 1 June 1999