[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？ wOs t).  
一下是我的Prescription Data数据： zM2_z  
GENERAL LENS DATA: |kh7F0';"  
bE>"DPq  
Surfaces                :                3 j NkobJ1  
Stop                    :                1 B0|!s  
System Aperture         : Object Space NA = 0.12 %,Lv},%Y  
Glass Catalogs          : Schott &*8_w-  
Ray Aiming              : Paraxial Reference, Cache On rki0!P`  
X Pupil shift          :               0 <
3C/t|s  
Y Pupil shift          :               0 ~"nF$DB  
Z Pupil shift          :               0 ?]PE!7H  
Apodization             : Gaussian, factor =   1.00000E+000 TNkvdE-S  
************************************************************* )4e?-?bK!  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) <S68UN(Ke  
Effective Focal Length  :        1.639158 (in image space) jWqjGX`  
************************************************************* kqQT^6S  
Back Focal Length       :       -1.061568 6,a:s:$>}R  
Total Track             :           4.318 +Fa!<txn  
Image Space F/#         :        3.417255 (]N- HN]v  
Paraxial Working F/#    :        2.950535 M2lvD&  
Working F/#             :        2.961912 G[$g-NU+  
Image Space NA          :       0.1670788 :kQydCuK  
Object Space NA         :            0.12 f O,5 u;  
Stop Radius             :       0.2398355 N`et]'_A}  
Paraxial Image Height   :               0 ;9$71E  
Paraxial Magnification  :               0 Xli$4 uL   
Entrance Pupil Diameter :       0.4796709 zy(NJ  
Entrance Pupil Position :               0 &OsO _F  
Exit Pupil Diameter     :        2.511155 3>QkO.b  
Exit Pupil Position     :        7.420935 +^|_vq^XR  
Field Type              : Angle in degrees _9:r4|S  
Maximum Field           :               0 G4](!f!Kv  
Primary Wave            :            1.31 3t9Weo)  
Lens Units              :   Millimeters y~n1S~5cI  
Angular Magnification   :               0 .bY R  
Ake@krh>$  
Fields          : 1 YpI|=mv  
Field Type: Angle in degrees zd|n!3;  
#        X-Value        Y-Value         Weight 0TWd.+  
1       0.000000       0.000000       1.000000 #f<3[BLx  
5Ky(C6E$s  
Vignetting Factors T:Nc^QP|tm  
#       VDX       VDY       VCX       VCY       VAN 49.B!DqQW&  
1  0.000000  0.000000  0.000000  0.000000  0.000000 LyH1tF  
@ Fkhida  
Wavelengths     : 1 pZz\o  
Units: Microns 4-m6e$p;  
#          Value         Weight AVi&cvhs  
1       1.310000       1.000000 lF
l(Sww!\  
8W Etm}  
CARDINAL POINTS: ! k 1 Ge+  
YS:p(jtd  
Object space positions are measured with respect to surface 1. F3[,6%4v  
Image space positions are measured with respect to the image surface. g%<n9AUl  
The index in both the object space and image space is considered. F1meftK  
+pRNrg?k  
                          Object Space         Image Space Y>6N2&Q  
W = 1.310000 (Primary) !<24Cy  
************************************************************ X|-[i hp;  
Focal Length          :           -1.639015            1.639015 Y (pUd3y  
************************************************************ S5V:HRj{?  
Focal Planes          :            0.313078           -1.159568 5] LfJh+"n  
Principal Planes      :            1.952094           -2.798584 m?kyAW'|  
Anti-Principal Planes :           -1.325937            0.479447 hd6O+i Y4  
Nodal Planes          :            1.952094           -2.798584 !2h ZtX  
Anti-Nodal Planes     :           -1.325937            0.479447 k.z(.uc=  
,u>[cRqw  
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