[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？ kO)Y|zQ  
一下是我的Prescription Data数据： 0^*,E/}P&  
GENERAL LENS DATA:
Q7y'0s  
A^}#  
Surfaces                :                3 !=S?*E +j)  
Stop                    :                1 +aOevkY]  
System Aperture         : Object Space NA = 0.12 6EC',=)6R  
Glass Catalogs          : Schott ln_&Ux+l  
Ray Aiming              : Paraxial Reference, Cache On W$]qo|2P  
X Pupil shift          :               0 v RD/67  
Y Pupil shift          :               0 =b66H]h?  
Z Pupil shift          :               0 i7)J|(N2.  
Apodization             : Gaussian, factor =   1.00000E+000 p+b/k2Q  
************************************************************* "PMJh3q  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) & *tL)qKDc  
Effective Focal Length  :        1.639158 (in image space) xqSZ{E:  
************************************************************* 0Fkr3x  
Back Focal Length       :       -1.061568 [+FiD  
Total Track             :           4.318 ~g{1lcqQP  
Image Space F/#         :        3.417255 gjsks(x  
Paraxial Working F/#    :        2.950535 ~>)>hy)  
Working F/#             :        2.961912 KsGW@Ho:  
Image Space NA          :       0.1670788 Gt{%O>P8t  
Object Space NA         :            0.12 A*BN  
Stop Radius             :       0.2398355 wYe;xk`>  
Paraxial Image Height   :               0 |./:A5_h  
Paraxial Magnification  :               0 .hckZx /  
Entrance Pupil Diameter :       0.4796709 xw{K,;WeO  
Entrance Pupil Position :               0 J#:`'eEG  
Exit Pupil Diameter     :        2.511155 nt"\FZ*;3  
Exit Pupil Position     :        7.420935 xVsI#`<a  
Field Type              : Angle in degrees PkFG0  
Maximum Field           :               0 AxEdQRGk  
Primary Wave            :            1.31 &@xm< A\S  
Lens Units              :   Millimeters #[i3cn  
Angular Magnification   :               0 BZv:E?1z  
!]?kvf-3e  
Fields          : 1 R{[v#sF >#  
Field Type: Angle in degrees v~x`a0  
#        X-Value        Y-Value         Weight Cn=#oE8
(A  
1       0.000000       0.000000       1.000000 S['rTuk  
){mqo
%{SO  
Vignetting Factors 7%$3`4i`O  
#       VDX       VDY       VCX       VCY       VAN n?c[ E+i;  
1  0.000000  0.000000  0.000000  0.000000  0.000000 ,f%
4xXI  
,2
U  
Wavelengths     : 1 t"9r`0>  
Units: Microns J>+\a1{  
#          Value         Weight VI|2vV6?  
1       1.310000       1.000000 ZUj1vf6I  
.5>]DZn6  
CARDINAL POINTS: >KQ/ c  
c0l?+:0M  
Object space positions are measured with respect to surface 1. oNYFbZw  
Image space positions are measured with respect to the image surface. 6i+AJCkC  
The index in both the object space and image space is considered. >mtwXmI  
H/*sl
qL  
                          Object Space         Image Space 3-AOB3](
 
W = 1.310000 (Primary) \PZ;y=]p}  
************************************************************ ]):>9q$C  
Focal Length          :           -1.639015            1.639015 zrA3bWs  
************************************************************ b7+(g[O  
Focal Planes          :            0.313078           -1.159568 45BpZ~-  
Principal Planes      :            1.952094           -2.798584 +t-_FbFh3D  
Anti-Principal Planes :           -1.325937            0.479447 NZG ^B/  
Nodal Planes          :            1.952094           -2.798584 *yHz#u'  
Anti-Nodal Planes     :           -1.325937            0.479447 #zgO_H  
?N9Z;_&^.  
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