Cooke Triplet

50-mm f/4.5 Cooke triplet with 20o 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

FieldAngle
(degrees)
XcYcRMS spot
diameter
1 00.00000 0.00000 0.00811 mm
2140.00000 -0.0057357 0.04576 mm
3200.00000 0.00087688 0.03947 mm

(Xc, Yc) 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

FieldAngle
(degrees)
RMS spot diameter (mm)
1 00.15834 0.07965 0.008110.0789750.15766
2140.17572 0.10232 0.045760.0758310.14642
3200.14642 0.06807 0.039470.0917230.15874
Focal Shift-1.00-0.500.000.501.00


Maintained by John Loomis, last updated 1 June 1999