[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？ \(~wZd  
一下是我的Prescription Data数据： .B72C[' c  
GENERAL LENS DATA: b0v:12q  
=PkO!Mm8  
Surfaces                :                3 zce`\ /:  
Stop                    :                1 oR .cSGh  
System Aperture         : Object Space NA = 0.12 g13 rx%-  
Glass Catalogs          : Schott 7a4o1;l  
Ray Aiming              : Paraxial Reference, Cache On Y^KTkS0D  
X Pupil shift          :               0 N~^yL<O  
Y Pupil shift          :               0 K4Sk+ v  
Z Pupil shift          :               0 :~F:/5
 
Apodization             : Gaussian, factor =   1.00000E+000 (#D*Pl  
************************************************************* vxFTen{-F  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) oVvc?P  
Effective Focal Length  :        1.639158 (in image space) r%@Lej5+  
************************************************************* "{D6J809  
Back Focal Length       :       -1.061568 \Q~8?p+  
Total Track             :           4.318 m2~&#c\  
Image Space F/#         :        3.417255 Yd EptAI  
Paraxial Working F/#    :        2.950535 .zg8i_  
Working F/#             :        2.961912 Cx<0 H  
Image Space NA          :       0.1670788 N8to
xRu  
Object Space NA         :            0.12 |re}6#TgcT  
Stop Radius             :       0.2398355 \1"'E@+  
Paraxial Image Height   :               0 O.`Jl%  
Paraxial Magnification  :               0 ^3VR-u<O  
Entrance Pupil Diameter :       0.4796709 ^y!;xc$(Qs  
Entrance Pupil Position :               0 *N'K/36;  
Exit Pupil Diameter     :        2.511155 ;0rGiWC#  
Exit Pupil Position     :        7.420935 T9W`?A  
Field Type              : Angle in degrees =GlVccc  
Maximum Field           :               0 H}hFFI)#Oo  
Primary Wave            :            1.31 #:jb*d?  
Lens Units              :   Millimeters 6W[}$#w  
Angular Magnification   :               0 Sr?#wev]rn  
7?j;7.i s(  
Fields          : 1 gr-9l0u  
Field Type: Angle in degrees ,DdB^Ig<r  
#        X-Value        Y-Value         Weight N|N3x7=gs  
1       0.000000       0.000000       1.000000 {7u[1[L1  
S$)*&46g  
Vignetting Factors Hy.AyU|L  
#       VDX       VDY       VCX       VCY       VAN `Z:R Ce^  
1  0.000000  0.000000  0.000000  0.000000  0.000000 aj8A8ma*}  
$`ZzvZ'r  
Wavelengths     : 1 Kl7WQg,XOi  
Units: Microns
IV%zO+  
#          Value         Weight m>USD?i  
1       1.310000       1.000000 o#) {1<0vg  
'c2W}$q  
CARDINAL POINTS: **9x?s  
:NJ_n6E  
Object space positions are measured with respect to surface 1. dQoYCS}IaV  
Image space positions are measured with respect to the image surface. -;f*VM.a  
The index in both the object space and image space is considered. vgY3L  
3LDS Z1f  
                          Object Space         Image Space XO#/Fv!  
W = 1.310000 (Primary) C~fjWz' V  
************************************************************ r/
pH_@  
Focal Length          :           -1.639015            1.639015 XL#[%X9  
************************************************************ Vk< LJ S  
Focal Planes          :            0.313078           -1.159568 QaUm1i#
 
Principal Planes      :            1.952094           -2.798584 rpeJkG@+  
Anti-Principal Planes :           -1.325937            0.479447 |,9JNm$  
Nodal Planes          :            1.952094           -2.798584 kEwaT$  
Anti-Nodal Planes     :           -1.325937            0.479447
_zlqtO  
J+rC
xn?;g  
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