[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？ (WC =om  
一下是我的Prescription Data数据： jq%<Z,rh  
GENERAL LENS DATA: +;lDU}$  
jH9PD8D\  
Surfaces                :                3 2|lR@L sr  
Stop                    :                1 )/@KdEA:  
System Aperture         : Object Space NA = 0.12 ^UJIDg7zS  
Glass Catalogs          : Schott 8c-ys-"#  
Ray Aiming              : Paraxial Reference, Cache On QOkt
IH  
X Pupil shift          :               0 >IrQhSF  
Y Pupil shift          :               0 Es7 c2YdU  
Z Pupil shift          :               0 nMzt_IlI  
Apodization             : Gaussian, factor =   1.00000E+000 p-{ 4 $W  
************************************************************* =Pw{1m|k  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) >~Zj  
Effective Focal Length  :        1.639158 (in image space) y/Y}C.IWp)  
************************************************************* U<0Wa>3zj  
Back Focal Length       :       -1.061568 8xAIn>,_  
Total Track             :           4.318 W7WHDL^  
Image Space F/#         :        3.417255 3]?='Qq.(  
Paraxial Working F/#    :        2.950535 A?#i{R  
Working F/#             :        2.961912 4AJT)I.  
Image Space NA          :       0.1670788 Nmz5:Rq  
Object Space NA         :            0.12 #;a+)~3*O  
Stop Radius             :       0.2398355 )jgz(\KZ  
Paraxial Image Height   :               0 ME]4tu  
Paraxial Magnification  :               0 f|B\Y/*X  
Entrance Pupil Diameter :       0.4796709 qfl!>  
Entrance Pupil Position :               0 ,Ohhl`q(  
Exit Pupil Diameter     :        2.511155 Lm=EN%*#9  
Exit Pupil Position     :        7.420935 yg'CL/P  
Field Type              : Angle in degrees ^UKY1Q.  
Maximum Field           :               0 7QTS@o-  
Primary Wave            :            1.31 ,= ApnNUgX  
Lens Units              :   Millimeters F]6G<6T[  
Angular Magnification   :               0 P_0X+Tz  
ffL]_E  
Fields          : 1 A"M;kzAfHM  
Field Type: Angle in degrees U.SC,;N^  
#        X-Value        Y-Value         Weight rBmW%Gv  
1       0.000000       0.000000       1.000000 k8}fKVU;  
4z5qXI/<m4  
Vignetting Factors 9D\E0YG X/  
#       VDX       VDY       VCX       VCY       VAN ZrEou}z(*  
1  0.000000  0.000000  0.000000  0.000000  0.000000 jc_k\  
J[?oV;O  
Wavelengths     : 1 33lh~+C  
Units: Microns bS8$[7OhX  
#          Value         Weight RyX11XU  
1       1.310000       1.000000 ==?wG!v2h  
Q3l>xh  
CARDINAL POINTS: N7"cMAs\G  
u3 LoP_|  
Object space positions are measured with respect to surface 1. `;}qj
m0a  
Image space positions are measured with respect to the image surface. k8stXW-w  
The index in both the object space and image space is considered. VO:  
o'$-  
                          Object Space         Image Space |;a$ l(~<  
W = 1.310000 (Primary) n-M6~   
************************************************************ 9'H:pb2  
Focal Length          :           -1.639015            1.639015 B^TgEr  
************************************************************ SHPDbBS  
Focal Planes          :            0.313078           -1.159568 N~v<8vJq`  
Principal Planes      :            1.952094           -2.798584 IxWi>8  
Anti-Principal Planes :           -1.325937            0.479447 ?E!M%c@,  
Nodal Planes          :            1.952094           -2.798584 Z<d=v3q  
Anti-Nodal Planes     :           -1.325937            0.479447 .R`_"7  
nnRb  
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