[求助]关于Effective focal length的问题 [复制链接]

  ZEMAX中priscription data会给出系统的许多有用的数据，其中包括effective focal length的数据和主平面位置的数据。但是我发现直接给出的effective focal length数据和根据其定义结合主平面的数据算出来的结果不一致，这时怎么回事？ )n[=)"rf  
一下是我的Prescription Data数据： ,DEcCHr,  
GENERAL LENS DATA: $Il  
P\QbMj1U  
Surfaces                :                3 |$+/IxDP  
Stop                    :                1 B(O6qWsL  
System Aperture         : Object Space NA = 0.12 FPPl^  
Glass Catalogs          : Schott (T&(PCw|  
Ray Aiming              : Paraxial Reference, Cache On -8dz`
o}  
X Pupil shift          :               0 ml!c0<  
Y Pupil shift          :               0 kjXwVGK=P<  
Z Pupil shift          :               0 .YP&E1lNi  
Apodization             : Gaussian, factor =   1.00000E+000 'Asr,[]?  
************************************************************* I7#JT?\}  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure)  .C5JQO  
Effective Focal Length  :        1.639158 (in image space) ;>F1?5P{  
************************************************************* h
-SKw=n  
Back Focal Length       :       -1.061568 xVN!w\0  
Total Track             :           4.318 e@/' o/  
Image Space F/#         :        3.417255 eZ0-O /_i  
Paraxial Working F/#    :        2.950535
FU.?n)P  
Working F/#             :        2.961912 Z`zLrXPD)  
Image Space NA          :       0.1670788 nE2?3S>  
Object Space NA         :            0.12 wm9wnAy  
Stop Radius             :       0.2398355 %?[0G,JG  
Paraxial Image Height   :               0 /FC(d
5I  
Paraxial Magnification  :               0  3UKd=YsJ  
Entrance Pupil Diameter :       0.4796709 Kb1@+  
Entrance Pupil Position :               0 W5~!)Ec  
Exit Pupil Diameter     :        2.511155 PSX o"   
Exit Pupil Position     :        7.420935 :VLYF$|  
Field Type              : Angle in degrees _+~&t9A!  
Maximum Field           :               0 "<%J^Z9G  
Primary Wave            :            1.31 FN (O  
Lens Units              :   Millimeters ^L8:..+:  
Angular Magnification   :               0 $M+'jjnP  
pF8+< T3y  
Fields          : 1 Q&"oh  
Field Type: Angle in degrees }7P[%(T5  
#        X-Value        Y-Value         Weight L=M'QJl9  
1       0.000000       0.000000       1.000000 ASr@5uFR  
n.R"n9v`  
Vignetting Factors E\cX  
#       VDX       VDY       VCX       VCY       VAN f&RjvVP?s  
1  0.000000  0.000000  0.000000  0.000000  0.000000 UIht`[(z  
<HIM k  
Wavelengths     : 1 g-NrxyTBlx  
Units: Microns pK"Z9y&  
#          Value         Weight UN:qE oS  
1       1.310000       1.000000 J8Vzf$t};  
?32i
1F!  
CARDINAL POINTS: T7O)  
} j;es(~D  
Object space positions are measured with respect to surface 1. RZ ?SiwE  
Image space positions are measured with respect to the image surface. jpoNTl'  
The index in both the object space and image space is considered. {y%@1q%"  
m| 7v76(  
                          Object Space         Image Space gFfKK`)}D'  
W = 1.310000 (Primary) ~,xso0  
************************************************************ ,q{~lf-  
Focal Length          :           -1.639015            1.639015 cR*~JwC:  
************************************************************ BW`;QF<  
Focal Planes          :            0.313078           -1.159568 #CB Kt
,  
Principal Planes      :            1.952094           -2.798584 J(=y$8xje  
Anti-Principal Planes :           -1.325937            0.479447 .C ,dV7  
Nodal Planes          :            1.952094           -2.798584 V{x[^+w7X~  
Anti-Nodal Planes     :           -1.325937            0.479447 q(1hY"S"}b  
i*A_Po  
我用*号，标出了需要注意的地方，请高手指教！

各位指点一下吧，自己顶起来！

帮顶！！！！！！！！！！！！！！1

等待高手帮忙吧 我也不会!

看的我头晕了,可能是感冒的缘故吧,以后有机会再探讨

我也不会先看看再说!~

慢慢理解