[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？ o5d
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一下是我的Prescription Data数据： 4R.#=]F  
GENERAL LENS DATA: .$
rcTZ  
_XN sDW4|  
Surfaces                :                3 3UEh%Ho  
Stop                    :                1 "Y6f.rB  
System Aperture         : Object Space NA = 0.12 [Fe5a  
Glass Catalogs          : Schott *e=e7KC6kI  
Ray Aiming              : Paraxial Reference, Cache On :v+39  
X Pupil shift          :               0 g~]FI
  
Y Pupil shift          :               0 {|50&]m  
Z Pupil shift          :               0 !^%b|=[  
Apodization             : Gaussian, factor =   1.00000E+000 _nF_RpS  
************************************************************* tO#y4<  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) MZ.Jk
f(  
Effective Focal Length  :        1.639158 (in image space) N6eY-`4y  
************************************************************* z\a#"2(G.  
Back Focal Length       :       -1.061568 5,A/6b  
Total Track             :           4.318 :?zOLw?(  
Image Space F/#         :        3.417255 BX?Si1c  
Paraxial Working F/#    :        2.950535 ?6|EAKJ`lK  
Working F/#             :        2.961912 *ZRQ
4i[+  
Image Space NA          :       0.1670788 rd6?;K0  
Object Space NA         :            0.12 Ood&cP'c  
Stop Radius             :       0.2398355 ey:3F%  
Paraxial Image Height   :               0 8"? t6Z;5  
Paraxial Magnification  :               0 a"}?{
  
Entrance Pupil Diameter :       0.4796709 6D>o(b2  
Entrance Pupil Position :               0 0@>3fR  
Exit Pupil Diameter     :        2.511155 ~FJd{$2x`  
Exit Pupil Position     :        7.420935 (RQ kwu/  
Field Type              : Angle in degrees Vki3D'.7N  
Maximum Field           :               0 Gg_i:4F  
Primary Wave            :            1.31 nI-\HAX  
Lens Units              :   Millimeters v vFX\j3  
Angular Magnification   :               0 yzYPT}t  
9G&l{7=  
Fields          : 1 3.Y/ZWON  
Field Type: Angle in degrees tjGQ0-Lo  
#        X-Value        Y-Value         Weight m}k rG  
1       0.000000       0.000000       1.000000 n-uoY<;hp  
IRLT-  
Vignetting Factors C{4[7  
#       VDX       VDY       VCX       VCY       VAN 3ILEc:<
0J  
1  0.000000  0.000000  0.000000  0.000000  0.000000 mZmwCS8  
dx|j,1e  
Wavelengths     : 1 I~Ziq10  
Units: Microns #=h~Lr'UH  
#          Value         Weight V^"5cW  
1       1.310000       1.000000 7JjTm^bu  
8uNq353  
CARDINAL POINTS: r'"H8>UZ%  
J 5~bs*a8  
Object space positions are measured with respect to surface 1. 8^2Q ~{i  
Image space positions are measured with respect to the image surface. hl8[A-d(R  
The index in both the object space and image space is considered. `uY77c
o6  
w18kTa!4@  
                          Object Space         Image Space HI55):Eb  
W = 1.310000 (Primary) Z{|wjZb(  
************************************************************ )jvYJ9s  
Focal Length          :           -1.639015            1.639015 2!}5shB  
************************************************************ N|wI=To  
Focal Planes          :            0.313078           -1.159568 C/!kMMh>vV  
Principal Planes      :            1.952094           -2.798584 X180_Kt2  
Anti-Principal Planes :           -1.325937            0.479447 =98@MX%P  
Nodal Planes          :            1.952094           -2.798584 W2s6!_AN  
Anti-Nodal Planes     :           -1.325937            0.479447 SD |5v*  
Ahm*_E2E  
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！