[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？ Z*TW;h0ZQ3  
一下是我的Prescription Data数据： Qr<%rU^{.  
GENERAL LENS DATA: hZ'oCRM  
=k*0O_  
Surfaces                :                3 `HS4(2+C  
Stop                    :                1 3N bn|_`(  
System Aperture         : Object Space NA = 0.12 #pe{:f?  
Glass Catalogs          : Schott cyhD%sB[D9  
Ray Aiming              : Paraxial Reference, Cache On  ft'iv  
X Pupil shift          :               0 *QG3Jz
 
Y Pupil shift          :               0 rq1kj 8%2  
Z Pupil shift          :               0 bF KPV%`  
Apodization             : Gaussian, factor =   1.00000E+000 !1RV[b.8  
************************************************************* |tg?b&QR  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) FR}H$R7#  
Effective Focal Length  :        1.639158 (in image space) :xw3b)KS  
************************************************************* FqTkUWd,#  
Back Focal Length       :       -1.061568 Z0=m:h  
Total Track             :           4.318 Qsntf.fT  
Image Space F/#         :        3.417255 5|R
2cc|"9  
Paraxial Working F/#    :        2.950535 O8r"M8  
Working F/#             :        2.961912 _=L;`~=C9e  
Image Space NA          :       0.1670788 |sFe:TX  
Object Space NA         :            0.12 ^2r}_AX  
Stop Radius             :       0.2398355 7I(t,AK
J  
Paraxial Image Height   :               0 w`}9/s;$  
Paraxial Magnification  :               0 CjQ"oQw  
Entrance Pupil Diameter :       0.4796709 gOyY#]g  
Entrance Pupil Position :               0 \5P.C  
Exit Pupil Diameter     :        2.511155 #tZf>zrs  
Exit Pupil Position     :        7.420935 =YGP%}_.p{  
Field Type              : Angle in degrees >J}n@MZ  
Maximum Field           :               0 d_
C4B  
Primary Wave            :            1.31 yK077zH_  
Lens Units              :   Millimeters b!]0mXU  
Angular Magnification   :               0 Iz)hz9k  
-k&{nD|  
Fields          : 1 ch>Vv"G>  
Field Type: Angle in degrees PDIclIMS'F  
#        X-Value        Y-Value         Weight 3fxNV<  
1       0.000000       0.000000       1.000000 /u)Rppu  
^%8qKC`Tt  
Vignetting Factors N\q)LM !M  
#       VDX       VDY       VCX       VCY       VAN  gt_XAH  
1  0.000000  0.000000  0.000000  0.000000  0.000000 d;~ 3P   
@ EmGexLPM  
Wavelengths     : 1 C.>  
Units: Microns Cqgk  
#          Value         Weight sz/*w7  
1       1.310000       1.000000 ^Cg^`n?@b  
t'R':+0Vf  
CARDINAL POINTS: 1OJ*wI*  
uxOJ3  
Object space positions are measured with respect to surface 1. YOV :  
Image space positions are measured with respect to the image surface. ]4Y/xi-  
The index in both the object space and image space is considered. [q-;/ed  
CV&zi6  
                          Object Space         Image Space mX&xn2}qZ"  
W = 1.310000 (Primary) FaFp_P?  
************************************************************ tAqA^f*{  
Focal Length          :           -1.639015            1.639015 (=1q!c`  
************************************************************ -J,Q;tj  
Focal Planes          :            0.313078           -1.159568 (0i'Nb"  
Principal Planes      :            1.952094           -2.798584 W+gpr|R2  
Anti-Principal Planes :           -1.325937            0.479447 NZLXN  
Nodal Planes          :            1.952094           -2.798584 6eQsoKK  
Anti-Nodal Planes     :           -1.325937            0.479447 pW\z\o/2  
~TDzq -U)  
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