[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$|c{2]=  
一下是我的Prescription Data数据： R~5*#r@f  
GENERAL LENS DATA: xgT~b9  
Ao,!z  
Surfaces                :                3 3AQ>>)T~  
Stop                    :                1 $K_YC~  
System Aperture         : Object Space NA = 0.12 $n#Bi.A j  
Glass Catalogs          : Schott $FusDdCv3  
Ray Aiming              : Paraxial Reference, Cache On YyJ{  
X Pupil shift          :               0 'tu@`7*  
Y Pupil shift          :               0 waWKpk1Wo  
Z Pupil shift          :               0 ,Lun-aMd  
Apodization             : Gaussian, factor =   1.00000E+000
Z-h7   
************************************************************* N>pmhskN?  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) d1TdH s\  
Effective Focal Length  :        1.639158 (in image space) uQu/(5  
************************************************************* oAZF3h]po  
Back Focal Length       :       -1.061568 #;"D)C  
Total Track             :           4.318 ~@4ZV  
Image Space F/#         :        3.417255 ;64mf`  
Paraxial Working F/#    :        2.950535 }uI7\\S  
Working F/#             :        2.961912 Z 5)_B,E:X  
Image Space NA          :       0.1670788 :IVk_[s  
Object Space NA         :            0.12 E R]sDV  
Stop Radius             :       0.2398355
ZG@M%|>  
Paraxial Image Height   :               0 puS&S *  
Paraxial Magnification  :               0 mYh5#E41J  
Entrance Pupil Diameter :       0.4796709 U7B/t3,=U  
Entrance Pupil Position :               0 M,t*nG  
Exit Pupil Diameter     :        2.511155 x* =sRf  
Exit Pupil Position     :        7.420935 46K&$6eN  
Field Type              : Angle in degrees M.)}e7  
Maximum Field           :               0 jkF+g$B  
Primary Wave            :            1.31 EY)Gi`lK  
Lens Units              :   Millimeters )jlP cO-  
Angular Magnification   :               0 4g7ja  
.;HIEj zq  
Fields          : 1 mGe|8In  
Field Type: Angle in degrees :GQIlA8cF$  
#        X-Value        Y-Value         Weight .B'UQ|NR  
1       0.000000       0.000000       1.000000 AUxM)H  
]
dHB}  
Vignetting Factors UK6xkra?#  
#       VDX       VDY       VCX       VCY       VAN 3T|Y}  
1  0.000000  0.000000  0.000000  0.000000  0.000000 @GG(7r\/B  
Zn@W7c,_I  
Wavelengths     : 1 !.3R~0b  
Units: Microns T3Frc ]6,4  
#          Value         Weight T0`"kjE  
1       1.310000       1.000000 ]am~aJ|L  
?h!t$QQ!M  
CARDINAL POINTS: ,\o<y|+`S  
wqlcLIJPR  
Object space positions are measured with respect to surface 1. d/B'[Ur  
Image space positions are measured with respect to the image surface. ?C &x/2lt  
The index in both the object space and image space is considered. i s L{9^  
>*dQqJI  
                          Object Space         Image Space |e*GzD  
W = 1.310000 (Primary) M%$DT  
************************************************************ LY-lTr@A^  
Focal Length          :           -1.639015            1.639015 A3AP51 !  
************************************************************ v@8S5KJ  
Focal Planes          :            0.313078           -1.159568 B(j02<-  
Principal Planes      :            1.952094           -2.798584 #>8T*B  
Anti-Principal Planes :           -1.325937            0.479447 {~"7vkc+  
Nodal Planes          :            1.952094           -2.798584 tu\mFHvlg  
Anti-Nodal Planes     :           -1.325937            0.479447 iOT)0@f'  
r^$\t0h(U8  
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