[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？ Bzrnmz5S  
一下是我的Prescription Data数据： .how@>:P+  
GENERAL LENS DATA: t1adS:)s  
VTu#)I7A^@  
Surfaces                :                3 V ql4*OJW  
Stop                    :                1 {siOa%;*  
System Aperture         : Object Space NA = 0.12 v 49o$s4J  
Glass Catalogs          : Schott e{5?+6KH  
Ray Aiming              : Paraxial Reference, Cache On C7FQc{  
X Pupil shift          :               0 Reikf}9Q  
Y Pupil shift          :               0 {R!yw`#^B  
Z Pupil shift          :               0 .J)TIc__|A  
Apodization             : Gaussian, factor =   1.00000E+000 TVD~Ix  
************************************************************* E$)|Kv^  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) b&U1
^{(  
Effective Focal Length  :        1.639158 (in image space) -I|xW  
************************************************************* N&NBn(  
Back Focal Length       :       -1.061568 *8Z2zmZtR^  
Total Track             :           4.318 I9S;t_Z<  
Image Space F/#         :        3.417255 il5C9ql$  
Paraxial Working F/#    :        2.950535 HY)xT$/J  
Working F/#             :        2.961912 h=7q;-@7  
Image Space NA          :       0.1670788 'Rn-SD~gIr  
Object Space NA         :            0.12 <?nIO
  
Stop Radius             :       0.2398355 );gY8UL^  
Paraxial Image Height   :               0 /I`TN5~  
Paraxial Magnification  :               0 $N=&D_Q  
Entrance Pupil Diameter :       0.4796709 E5&Z={  
Entrance Pupil Position :               0 DXiA4ihr=  
Exit Pupil Diameter     :        2.511155 6{y7e L3!  
Exit Pupil Position     :        7.420935 |h]V9=  
Field Type              : Angle in degrees d.wGO]"  
Maximum Field           :               0 gJ6`Kl985O  
Primary Wave            :            1.31 pLB2! +  
Lens Units              :   Millimeters h<G4tjtk  
Angular Magnification   :               0 Ga7E}y%  
n%&L&G  
Fields          : 1 _!03;zrO  
Field Type: Angle in degrees Sa= tiOv  
#        X-Value        Y-Value         Weight AByl1)r|  
1       0.000000       0.000000       1.000000 )d2Z g  
J/je/PC  
Vignetting Factors KZ
ppQ0  
#       VDX       VDY       VCX       VCY       VAN F0:]@0>r  
1  0.000000  0.000000  0.000000  0.000000  0.000000 +:FXtO>n"  
\;{ ]YX  
Wavelengths     : 1 d51lTGH7Z  
Units: Microns iq; | i!  
#          Value         Weight {"ST hTZ  
1       1.310000       1.000000 I=0c\ U}  
8Qg10Yjy  
CARDINAL POINTS: 54_}9_g  
*7!MG  
Object space positions are measured with respect to surface 1. '}Fe&%  
Image space positions are measured with respect to the image surface. NHd@s#@  
The index in both the object space and image space is considered. *g(d}C!  
a"vzC$Hxd  
                          Object Space         Image Space h*S"]ye5  
W = 1.310000 (Primary) `nP
dZ.  
************************************************************ jx}&%p X  
Focal Length          :           -1.639015            1.639015 ZJ/528Ju  
************************************************************ uavATnGO{B  
Focal Planes          :            0.313078           -1.159568 WPNB!"E98  
Principal Planes      :            1.952094           -2.798584 B7%,D}  
Anti-Principal Planes :           -1.325937            0.479447 8}'iEj^e  
Nodal Planes          :            1.952094           -2.798584 $C[z]}iOi  
Anti-Nodal Planes     :           -1.325937            0.479447 51k}LH  
>XgoN\w
 
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