[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？ 2wnk~URj  
一下是我的Prescription Data数据： <bo^uw  
GENERAL LENS DATA: i7PS=]TK\  
4H;7GNu  
Surfaces                :                3 )B+o F7  
Stop                    :                1 ("PZ!z1m1  
System Aperture         : Object Space NA = 0.12 |bSAn*6b  
Glass Catalogs          : Schott fa,:d8  
Ray Aiming              : Paraxial Reference, Cache On pbDr:kBL  
X Pupil shift          :               0 5Za<]qxr  
Y Pupil shift          :               0 <}A6 )=T  
Z Pupil shift          :               0 =,q/FY:  
Apodization             : Gaussian, factor =   1.00000E+000 pfIK9>i  
************************************************************* ks("( nU  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) )m3emMO2  
Effective Focal Length  :        1.639158 (in image space) {fDRVnI?  
************************************************************* A^+kA)8  
Back Focal Length       :       -1.061568 F.x7/;  
Total Track             :           4.318 W`JI/  
Image Space F/#         :        3.417255 TCzlu#w  
Paraxial Working F/#    :        2.950535 Ye4 &4t  
Working F/#             :        2.961912 .sQV0jF{  
Image Space NA          :       0.1670788 m<z?6VC  
Object Space NA         :            0.12 aM1WC 'c&)  
Stop Radius             :       0.2398355 [h-NX  
Paraxial Image Height   :               0 jg'"?KSU~  
Paraxial Magnification  :               0 Qi dI  
Entrance Pupil Diameter :       0.4796709 17c`c.yP  
Entrance Pupil Position :               0 8YE4ln  
Exit Pupil Diameter     :        2.511155 zVtTv-DU  
Exit Pupil Position     :        7.420935 A{B$$7%  
Field Type              : Angle in degrees W^Fkjqpv  
Maximum Field           :               0 B*3_m _a  
Primary Wave            :            1.31 Ksh[I,+N\  
Lens Units              :   Millimeters !BrZTo  
Angular Magnification   :               0 1I'}Uh*  
G7,v:dlK   
Fields          : 1 35AH|U7b  
Field Type: Angle in degrees h(}#s1Fzq  
#        X-Value        Y-Value         Weight W7~_XI  
1       0.000000       0.000000       1.000000 muF&t'k  
Y>FLc* h  
Vignetting Factors !,Gavt7f  
#       VDX       VDY       VCX       VCY       VAN 2Hx*kh2  
1  0.000000  0.000000  0.000000  0.000000  0.000000 QD^=;!  
N;P
/$  
Wavelengths     : 1 UHi^7jQ  
Units: Microns K*'AjT9wX+  
#          Value         Weight {Fyw<0 [@  
1       1.310000       1.000000 i=>`=. ~  
5syzh S  
CARDINAL POINTS: ?wmu
0rR  
ZJGIib  
Object space positions are measured with respect to surface 1. R6>*n!*D@  
Image space positions are measured with respect to the image surface. xDekC~Zq  
The index in both the object space and image space is considered. L
{&1w  
hHcevSr  
                          Object Space         Image Space _}']h^@Z  
W = 1.310000 (Primary) d/*EuJYin<  
************************************************************ j+/EG^*/  
Focal Length          :           -1.639015            1.639015 yJqDB$0  
************************************************************ c<cYX;O  
Focal Planes          :            0.313078           -1.159568 cMy?&  
Principal Planes      :            1.952094           -2.798584 RN1KM  
Anti-Principal Planes :           -1.325937            0.479447 R*LPwJuv  
Nodal Planes          :            1.952094           -2.798584 _3f/lG?&-  
Anti-Nodal Planes     :           -1.325937            0.479447 F/A)2 H_  
WRAv>s9  
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