[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？ IJ;*N  
一下是我的Prescription Data数据： [2V/v  
GENERAL LENS DATA: yxbTcZ  
s 'xmv{|  
Surfaces                :                3 ?miM15XI  
Stop                    :                1 `'WLGQG  
System Aperture         : Object Space NA = 0.12 5g5NTm`=<  
Glass Catalogs          : Schott !$Z"\v'b  
Ray Aiming              : Paraxial Reference, Cache On 9DX3]Z\7X  
X Pupil shift          :               0 Sj?sw]3  
Y Pupil shift          :               0 CN(4;-so)  
Z Pupil shift          :               0 B:cOcd?p  
Apodization             : Gaussian, factor =   1.00000E+000 1#"Q'
,7  
************************************************************* .Er/t"Qs;  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) ?` i/  
Effective Focal Length  :        1.639158 (in image space) DT4RodE$  
************************************************************* JxJntsn  
Back Focal Length       :       -1.061568 u,:`5*al{  
Total Track             :           4.318 zi .
,?Q  
Image Space F/#         :        3.417255 \DK*>
k  
Paraxial Working F/#    :        2.950535 ()?co<@(l  
Working F/#             :        2.961912 Xkom@F~]  
Image Space NA          :       0.1670788 j*d~h$[k  
Object Space NA         :            0.12 <t% A)L%  
Stop Radius             :       0.2398355 x35s6  
Paraxial Image Height   :               0 \*aLyyy3  
Paraxial Magnification  :               0 :n9~H+!  
Entrance Pupil Diameter :       0.4796709 C)s1' =TZ  
Entrance Pupil Position :               0 y$o=\:  
Exit Pupil Diameter     :        2.511155 :
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Exit Pupil Position     :        7.420935 Ba|}C(Ws?  
Field Type              : Angle in degrees 'hw@l>1\9  
Maximum Field           :               0 H^;S}<pxW  
Primary Wave            :            1.31 /? 1Yf  
Lens Units              :   Millimeters fMPq  
Angular Magnification   :               0 k<zGrq=8J  
?0<INS~  
Fields          : 1 kDY]>v  
Field Type: Angle in degrees x*8f3^ wE  
#        X-Value        Y-Value         Weight h^kNM8  
1       0.000000       0.000000       1.000000 hRIS[#z;U  
ESjJHZoD(  
Vignetting Factors sJK:xk.6!  
#       VDX       VDY       VCX       VCY       VAN Ja=70ZI^6  
1  0.000000  0.000000  0.000000  0.000000  0.000000 p]z54 ~  
%%cSvPcz  
Wavelengths     : 1 Ty0T7D  
Units: Microns m_02"'  
#          Value         Weight Dh(T)yc  
1       1.310000       1.000000 1idjX"'  
afiK!0col2  
CARDINAL POINTS: ak8^/1*@  
{-N9
0Oe  
Object space positions are measured with respect to surface 1. J&ECm+2  
Image space positions are measured with respect to the image surface. dIa(</ }  
The index in both the object space and image space is considered. ) v5n "W  
0$ 9;pzr  
                          Object Space         Image Space qL5#.bR  
W = 1.310000 (Primary) fwv T2G4  
************************************************************ %_R|@cyD  
Focal Length          :           -1.639015            1.639015 dN\P&"`  
************************************************************ \.;ct  
Focal Planes          :            0.313078           -1.159568 R5&$h$[/  
Principal Planes      :            1.952094           -2.798584 GHC?Tp  
Anti-Principal Planes :           -1.325937            0.479447 UoMWn"ZE  
Nodal Planes          :            1.952094           -2.798584 ]n]uN~)9  
Anti-Nodal Planes     :           -1.325937            0.479447 &Dg)"Xji  
Y:!/4GF  
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