[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？ :O413#8  
一下是我的Prescription Data数据： ,mz;$z6i  
GENERAL LENS DATA: 4wSZ'RTSR  
gfK_g)'2U  
Surfaces                :                3 ~qqxHymc  
Stop                    :                1 \=WPJm`p  
System Aperture         : Object Space NA = 0.12 `R2Iw I&  
Glass Catalogs          : Schott 8p 4[:M@  
Ray Aiming              : Paraxial Reference, Cache On xF{%@t  
X Pupil shift          :               0 z@VL?A(3  
Y Pupil shift          :               0 tn$TyCzckW  
Z Pupil shift          :               0 N
*36rR$^  
Apodization             : Gaussian, factor =   1.00000E+000 `n>|rd  
************************************************************* ^>an4UJt  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) `F/R:!v  
Effective Focal Length  :        1.639158 (in image space) ;-`NT` #2  
************************************************************* kKlNhP(  
Back Focal Length       :       -1.061568 ufk2zL8y  
Total Track             :           4.318 nT> v  
Image Space F/#         :        3.417255 l1T`[2  
Paraxial Working F/#    :        2.950535 MxpAh<u!vF  
Working F/#             :        2.961912 L'Cd`.yVO  
Image Space NA          :       0.1670788 )yyH_Ax2  
Object Space NA         :            0.12 G4c@v1#%.  
Stop Radius             :       0.2398355 #qVTB@d  
Paraxial Image Height   :               0 /4(HVua  
Paraxial Magnification  :               0 bhpaC8|  
Entrance Pupil Diameter :       0.4796709 /x@aAJ|
 
Entrance Pupil Position :               0 d_we?DZ|  
Exit Pupil Diameter     :        2.511155 C:No ^nH>  
Exit Pupil Position     :        7.420935 K W&muD  
Field Type              : Angle in degrees iT&4;W=72~  
Maximum Field           :               0 s3sRMB2  
Primary Wave            :            1.31 )&T 5/+  
Lens Units              :   Millimeters Jw5@#
j  
Angular Magnification   :               0 O>~@>/#  
EHq;eF  
Fields          : 1 )w4U]inJ$"  
Field Type: Angle in degrees jywS<9c@  
#        X-Value        Y-Value         Weight lwf
S$7^P  
1       0.000000       0.000000       1.000000 l| uiC%T  

E+i(p+=4  
Vignetting Factors 3ux7^au  
#       VDX       VDY       VCX       VCY       VAN [_%u5sc-y  
1  0.000000  0.000000  0.000000  0.000000  0.000000 v76P?[  
cEa8l~GC<  
Wavelengths     : 1 Jf4` 2KN\  
Units: Microns odca?  
#          Value         Weight *g
*"bi*  
1       1.310000       1.000000 M-].l3  
oH17!$Fly  
CARDINAL POINTS: "0%K3d+  
1\,k^
Je7  
Object space positions are measured with respect to surface 1. 6IRRRtO(  
Image space positions are measured with respect to the image surface. /[lEZ['^  
The index in both the object space and image space is considered. A-L1vu;  
0p[k7W u  
                          Object Space         Image Space 4G:~|N.{p  
W = 1.310000 (Primary) mfg>69,w  
************************************************************ !i8)si_  
Focal Length          :           -1.639015            1.639015 c

h%zu%;f  
************************************************************ Es#:0KH].v  
Focal Planes          :            0.313078           -1.159568 i/*)1;xsk  
Principal Planes      :            1.952094           -2.798584 ,{G\-(\  
Anti-Principal Planes :           -1.325937            0.479447 5uG^`H@X  
Nodal Planes          :            1.952094           -2.798584 :Ni#XZ{F-/  
Anti-Nodal Planes     :           -1.325937            0.479447 YGPb8!  
z\<,}x}V  
我用*号，标出了需要注意的地方，请高手指教！

慢慢理解

我也不会先看看再说!~

看的我头晕了,可能是感冒的缘故吧,以后有机会再探讨

等待高手帮忙吧 我也不会!

帮顶！！！！！！！！！！！！！！1

各位指点一下吧，自己顶起来！