[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？ pl|<g9  
一下是我的Prescription Data数据： ely&'y!  
GENERAL LENS DATA: >3 qy'lm  
V4/eGh_T  
Surfaces                :                3 qt/"$
6]%  
Stop                    :                1 vTU"c>]  
System Aperture         : Object Space NA = 0.12 -V_e=Y<J/  
Glass Catalogs          : Schott 'xr\\Cd9s  
Ray Aiming              : Paraxial Reference, Cache On B>YrDJUN  
X Pupil shift          :               0 Scxf5x-  
Y Pupil shift          :               0 \'BKI;  
Z Pupil shift          :               0 hFylQfd  
Apodization             : Gaussian, factor =   1.00000E+000 $P4hNb  
************************************************************* bZERh:%o  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) LTBqXh  
Effective Focal Length  :        1.639158 (in image space) [C P V5\2  
************************************************************* Kze\|yJ  
Back Focal Length       :       -1.061568 |VaXOdD`&  
Total Track             :           4.318 G4=%<+
  
Image Space F/#         :        3.417255 o6Vc}jRH  
Paraxial Working F/#    :        2.950535 %C'!L]#  
Working F/#             :        2.961912 O_(J',++  
Image Space NA          :       0.1670788 }^)M)8zS  
Object Space NA         :            0.12  QqtFNG  
Stop Radius             :       0.2398355 }[D[ZLv  
Paraxial Image Height   :               0 W53i5u(  
Paraxial Magnification  :               0 |hOqz2|  
Entrance Pupil Diameter :       0.4796709 |F9/7 z\5+  
Entrance Pupil Position :               0 m'z<d  
Exit Pupil Diameter     :        2.511155 &$< S1  
Exit Pupil Position     :        7.420935 z}u  
Field Type              : Angle in degrees u+XZdV  
Maximum Field           :               0 tGv4 S\  
Primary Wave            :            1.31 j31 Sc3vG  
Lens Units              :   Millimeters nVs0
$?}  
Angular Magnification   :               0 > YN<~z-  
l.>QO ;  
Fields          : 1 ,B!u*  
Field Type: Angle in degrees GS<,adD  
#        X-Value        Y-Value         Weight lZ/Yp~2S  
1       0.000000       0.000000       1.000000 Q9FY.KUM  
b`18y cVME  
Vignetting Factors :+!hR4Z~\;  
#       VDX       VDY       VCX       VCY       VAN F-UY~i8  
1  0.000000  0.000000  0.000000  0.000000  0.000000 ~;Xdz/  
w9i1ag  
Wavelengths     : 1 ]>*Z 1g;
  
Units: Microns :mY(d6#A>  
#          Value         Weight \u",bMQF  
1       1.310000       1.000000 Jw"'ZW#W  
vIz~B2%x  
CARDINAL POINTS:
w9c  
DFqXZfjm  
Object space positions are measured with respect to surface 1. L!-T`R8'c  
Image space positions are measured with respect to the image surface. "m/0>U
U0  
The index in both the object space and image space is considered. d&.)Dw  
j YO#  
                          Object Space         Image Space M)Ogb'@#  
W = 1.310000 (Primary) 
5Lm ?  
************************************************************ u=RF6V|  
Focal Length          :           -1.639015            1.639015 s.Yywy  
************************************************************ L[##w?Xf.  
Focal Planes          :            0.313078           -1.159568 U*[/F)!  
Principal Planes      :            1.952094           -2.798584 au0)yg*V1  
Anti-Principal Planes :           -1.325937            0.479447 viY _Y.Yjy  
Nodal Planes          :            1.952094           -2.798584 mA3C)V  
Anti-Nodal Planes     :           -1.325937            0.479447 LT#*nr  
<:>a51HBX  
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