[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？ "dN4EA
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一下是我的Prescription Data数据： {"x>ewAf  
GENERAL LENS DATA: ;94e   
}bZcVc2  
Surfaces                :                3 'q:t48&  
Stop                    :                1 QwaAGUA  
System Aperture         : Object Space NA = 0.12 &~SPDiu.t  
Glass Catalogs          : Schott MkCq$MA  
Ray Aiming              : Paraxial Reference, Cache On )8rN  
X Pupil shift          :               0 C72!::o  
Y Pupil shift          :               0 s,*kWy"jp  
Z Pupil shift          :               0 oieZopYA  
Apodization             : Gaussian, factor =   1.00000E+000 5,,b>Z<  
************************************************************* fZH";_"1  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) M&/([>Q  
Effective Focal Length  :        1.639158 (in image space) [!k#au+#c  
************************************************************* :nPLQqXGQ  
Back Focal Length       :       -1.061568 6*({ZE  
Total Track             :           4.318 Y4 <  
Image Space F/#         :        3.417255 I5$@1+B  
Paraxial Working F/#    :        2.950535 -x)zyq6  
Working F/#             :        2.961912
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Image Space NA          :       0.1670788 =%\y E0#  
Object Space NA         :            0.12 p903*F^[,  
Stop Radius             :       0.2398355 "")I1iO g  
Paraxial Image Height   :               0 D_W,Jm
et  
Paraxial Magnification  :               0 |1@/gqa  
Entrance Pupil Diameter :       0.4796709 NdlJdq  
Entrance Pupil Position :               0 Uo7V)I;o  
Exit Pupil Diameter     :        2.511155 n> >!dg Og  
Exit Pupil Position     :        7.420935 @/w($w"  
Field Type              : Angle in degrees QS*!3?%  
Maximum Field           :               0 ]0+5@c  
Primary Wave            :            1.31 Y5Ub[o  
Lens Units              :   Millimeters 9~En;e  
Angular Magnification   :               0 .YT&V  
Rpi@^~aPE  
Fields          : 1 sUki|lP  
Field Type: Angle in degrees b\dzB\,&  
#        X-Value        Y-Value         Weight S5W*,?  
1       0.000000       0.000000       1.000000 heAbxs  
<H,q( :pM  
Vignetting Factors <DM /"^*  
#       VDX       VDY       VCX       VCY       VAN "|\G[xLOaW  
1  0.000000  0.000000  0.000000  0.000000  0.000000 c5($*tTT  
Rqk;!N  
Wavelengths     : 1 wTL&m+xr  
Units: Microns %pR:.u|  
#          Value         Weight BfcpB)N&.K  
1       1.310000       1.000000 y7s:Buyc  
W6d[v/+K+  
CARDINAL POINTS: 3V,$FS]  
RbY=OOQ  
Object space positions are measured with respect to surface 1. 78iu<L+If  
Image space positions are measured with respect to the image surface. Td7=La0
 
The index in both the object space and image space is considered. P{'T9U|O-  
p\7(`0?8VN  
                          Object Space         Image Space sI@y)z  
W = 1.310000 (Primary) rr@S|k:|  
************************************************************ Y\Z.E;  
Focal Length          :           -1.639015            1.639015 rfl-(_3  
************************************************************ aBH!K   
Focal Planes          :            0.313078           -1.159568 2itJD1;  
Principal Planes      :            1.952094           -2.798584 {GTOHJ2  
Anti-Principal Planes :           -1.325937            0.479447 4490l"  
Nodal Planes          :            1.952094           -2.798584 (sXR@Ce$  
Anti-Nodal Planes     :           -1.325937            0.479447 (4hCT*  
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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