[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？ Y5Jrkr)k  
一下是我的Prescription Data数据： |/-H:\5  
GENERAL LENS DATA: aI:G(C?jm  
YYUWBnf30G  
Surfaces                :                3 U(cV#@Y  
Stop                    :                1 wqLY \  
System Aperture         : Object Space NA = 0.12 VdV18-ea  
Glass Catalogs          : Schott =tE7XC3X_  
Ray Aiming              : Paraxial Reference, Cache On h"{Z%XPX#  
X Pupil shift          :               0 &}G2;O}3  
Y Pupil shift          :               0 @NS=  
Z Pupil shift          :               0 Y^-faL7*\  
Apodization             : Gaussian, factor =   1.00000E+000 }&OgIo+  
************************************************************* &k4)&LQJ  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) BHh%3Q  
Effective Focal Length  :        1.639158 (in image space) yY$:zc"J  
************************************************************* y9OxPq.Cy  
Back Focal Length       :       -1.061568 LD~/*  
Total Track             :           4.318 =)GhrWeVi4  
Image Space F/#         :        3.417255 H#luG_)  
Paraxial Working F/#    :        2.950535 Hki  
Working F/#             :        2.961912 P=%'2BQ{{  
Image Space NA          :       0.1670788 !Z*2X ^  
Object Space NA         :            0.12 tGcp48R-:+  
Stop Radius             :       0.2398355 L`Lro:E?kL  
Paraxial Image Height   :               0 ,dM}B-  
Paraxial Magnification  :               0 .6m%/-whS  
Entrance Pupil Diameter :       0.4796709 yJJNr]oq  
Entrance Pupil Position :               0 9fyJw1  
Exit Pupil Diameter     :        2.511155 Rh:edQ#  
Exit Pupil Position     :        7.420935 HH
+$rrTT  
Field Type              : Angle in degrees Q$NT>d6Q  
Maximum Field           :               0 1 U|IN=  
Primary Wave            :            1.31 (c<MyuWb  
Lens Units              :   Millimeters !vB8Pk"  
Angular Magnification   :               0 +p:#$R)MW  
T(E$0a)#  
Fields          : 1 n9}3>~ll  
Field Type: Angle in degrees k/&~8l.$  
#        X-Value        Y-Value         Weight n-P)X<\  
1       0.000000       0.000000       1.000000 fP>*EDn@xg  
f?OFMac  
Vignetting Factors Yz?4eSa/  
#       VDX       VDY       VCX       VCY       VAN Q,# )  
1  0.000000  0.000000  0.000000  0.000000  0.000000 G{,X_MZ%  
[YQVZBT|{  
Wavelengths     : 1 Z9MT, "  
Units: Microns lj{Jw.t  
#          Value         Weight zoUM<6q  
1       1.310000       1.000000 h <s.o#8  
}i7Gv K<[:  
CARDINAL POINTS: Ka|WT
|1  
VfK8')IXk  
Object space positions are measured with respect to surface 1. '+6Sk
Z  
Image space positions are measured with respect to the image surface. &QaFX,N"  
The index in both the object space and image space is considered. y6bl&_  
+}
al_.  
                          Object Space         Image Space U8+5{,$\.  
W = 1.310000 (Primary)
gq|T:  
************************************************************ 8{@0p"re@  
Focal Length          :           -1.639015            1.639015 @j/UDM  
************************************************************ vR X_}`m8#  
Focal Planes          :            0.313078           -1.159568 2E Ufd\  
Principal Planes      :            1.952094           -2.798584 bG`aF*10)!  
Anti-Principal Planes :           -1.325937            0.479447 vN`2KCl~3  
Nodal Planes          :            1.952094           -2.798584 =i_ s#v[Y  
Anti-Nodal Planes     :           -1.325937            0.479447 r~&[Gaw  
8CR b6  
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