[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？ p=3t!3  
一下是我的Prescription Data数据： Kj)sL0  
GENERAL LENS DATA: F{^\vFp  
{{?MO{Mh*  
Surfaces                :                3  $@O?  
Stop                    :                1 %!eRR  
System Aperture         : Object Space NA = 0.12 |P`b"x  
Glass Catalogs          : Schott w
E"lk  
Ray Aiming              : Paraxial Reference, Cache On o")"^@Zhi  
X Pupil shift          :               0 {]dG 9  
Y Pupil shift          :               0 g rCQ#3K*?  
Z Pupil shift          :               0 EIfqRRTA  
Apodization             : Gaussian, factor =   1.00000E+000 W?"l6s  
************************************************************* u80C>sQ  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) bDudETl  
Effective Focal Length  :        1.639158 (in image space) %8wBZ~1-  
************************************************************* `\|t
Xl.  
Back Focal Length       :       -1.061568 Hpa6;eT  
Total Track             :           4.318 7r^Cs#b+I  
Image Space F/#         :        3.417255 )B+R|PZ,  
Paraxial Working F/#    :        2.950535 m.!LL]]  
Working F/#             :        2.961912 5*+DN U@  
Image Space NA          :       0.1670788 zA}JVB  
Object Space NA         :            0.12 d
3 i(UN]  
Stop Radius             :       0.2398355 yf!7 Q>_G^  
Paraxial Image Height   :               0 l0;u$  
Paraxial Magnification  :               0 ?@Q0;LG  
Entrance Pupil Diameter :       0.4796709 x2a ?ugQ  
Entrance Pupil Position :               0 vq.o;q /  
Exit Pupil Diameter     :        2.511155 cvo+{u$s  
Exit Pupil Position     :        7.420935 Pksr9"Ah  
Field Type              : Angle in degrees GyMN;|  
Maximum Field           :               0 M$.bC0}T  
Primary Wave            :            1.31 ](v,2(}=  
Lens Units              :   Millimeters ju3@F8AI  
Angular Magnification   :               0 SvQ|SKE'
:  
+H?g9v40  
Fields          : 1 lZ)6d
-vK  
Field Type: Angle in degrees [[]yQ "  
#        X-Value        Y-Value         Weight Pz[UAJ  
1       0.000000       0.000000       1.000000 ms;zC/  
%rJDpB{  
Vignetting Factors $]Ix(7@W  
#       VDX       VDY       VCX       VCY       VAN j,;f#+O`g  
1  0.000000  0.000000  0.000000  0.000000  0.000000 l)o!&]2  
AZE%fOG<i  
Wavelengths     : 1 H\n6t-l  
Units: Microns vea{o35!  
#          Value         Weight *3E3,c8{A  
1       1.310000       1.000000 jA;b2A]G  
5._QI/d)'J  
CARDINAL POINTS: n0gjcDHQ  
QIU%!9Y  
Object space positions are measured with respect to surface 1. $[ S 33Q  
Image space positions are measured with respect to the image surface. h.]^o*DJ  
The index in both the object space and image space is considered. gY
[G>D=  
=OtW!vx#R.  
                          Object Space         Image Space Jk`Jv;  
W = 1.310000 (Primary) llR5qq=t  
************************************************************ /Dd x[P5p=  
Focal Length          :           -1.639015            1.639015
/m;Bwu  
************************************************************ j^8HTa0Cy|  
Focal Planes          :            0.313078           -1.159568 -zMvpe-am&  
Principal Planes      :            1.952094           -2.798584 l3u+fE,;_  
Anti-Principal Planes :           -1.325937            0.479447 r>|S4O  
Nodal Planes          :            1.952094           -2.798584 ": BZZ\!  
Anti-Nodal Planes     :           -1.325937            0.479447 X]2Ib'(  
HJJ)DE7;  
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