[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？ //;(KmU9  
一下是我的Prescription Data数据： e&2,cQRFV  
GENERAL LENS DATA: FZW`ADq]  
'6})L  
Surfaces                :                3 SO.u0!  
Stop                    :                1 kG{};Vm  
System Aperture         : Object Space NA = 0.12 M^Y[Y@U
=p  
Glass Catalogs          : Schott wP*3Hx;S  
Ray Aiming              : Paraxial Reference, Cache On "\O7_od-  
X Pupil shift          :               0 o[}Dj6e\t  
Y Pupil shift          :               0 nu7 R  
Z Pupil shift          :               0 [^?i<z{0C  
Apodization             : Gaussian, factor =   1.00000E+000 <ch}]-_  
************************************************************* ;[UI]?A%  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) oH+PlL  
Effective Focal Length  :        1.639158 (in image space) #HH[D;z  
************************************************************* SMIDW}U2S  
Back Focal Length       :       -1.061568 FwlDP  
Total Track             :           4.318 qJ(uak  
Image Space F/#         :        3.417255 2$kB^g!:o  
Paraxial Working F/#    :        2.950535 H8I)D& cw  
Working F/#             :        2.961912 rAAx]nQ@  
Image Space NA          :       0.1670788 jL8A_'3B  
Object Space NA         :            0.12 TIZ2'q5wg  
Stop Radius             :       0.2398355 K!Fem6R  
Paraxial Image Height   :               0
vanV|O  
Paraxial Magnification  :               0 1/m$#sz  
Entrance Pupil Diameter :       0.4796709 _B#x{ii  
Entrance Pupil Position :               0 MZ&.{SY7  
Exit Pupil Diameter     :        2.511155 tM
;cvc`/  
Exit Pupil Position     :        7.420935 pi~5}bF!a  
Field Type              : Angle in degrees l"A/6r!Dp  
Maximum Field           :               0 [uHU[ sG  
Primary Wave            :            1.31 S6(48/  
Lens Units              :   Millimeters <W!nlh  
Angular Magnification   :               0 !.X/(R7J  
[ i,[^  
Fields          : 1 l^ay*H  
Field Type: Angle in degrees x'|9A?ez@Z  
#        X-Value        Y-Value         Weight E b:iym0  
1       0.000000       0.000000       1.000000 JZ`SV}\`  
Nwt[)\W `  
Vignetting Factors ] 1pIIX}  
#       VDX       VDY       VCX       VCY       VAN u9|Eos i  
1  0.000000  0.000000  0.000000  0.000000  0.000000 ]|eMEN['  
dp^PiyL  
Wavelengths     : 1 d@g29rs  
Units: Microns gJX"4]Ol#}  
#          Value         Weight }a[]I%bu2  
1       1.310000       1.000000 mjP  
b#p0s?*  
CARDINAL POINTS: z^`4n_(Ygu  
&WBpd}|+Y  
Object space positions are measured with respect to surface 1. F?R6zvive  
Image space positions are measured with respect to the image surface. ;"0bVs`.^e  
The index in both the object space and image space is considered. 9ybR+dGm+  
J)B3o$  
                          Object Space         Image Space r<1W.xd":  
W = 1.310000 (Primary) :t!J 9  
************************************************************ hG.}>(VV  
Focal Length          :           -1.639015            1.639015 1aO(+](;  
************************************************************ zO\_^A|8H  
Focal Planes          :            0.313078           -1.159568 Yb5@W/'  
Principal Planes      :            1.952094           -2.798584 g2TK(S|#  
Anti-Principal Planes :           -1.325937            0.479447 Zf}2c8Vc4  
Nodal Planes          :            1.952094           -2.798584 ~&p]kmwXSX  
Anti-Nodal Planes     :           -1.325937            0.479447 gizY4~ j  
S+[,\>pY  
我用*号，标出了需要注意的地方，请高手指教！

慢慢理解

我也不会先看看再说!~

看的我头晕了,可能是感冒的缘故吧,以后有机会再探讨

等待高手帮忙吧 我也不会!

帮顶！！！！！！！！！！！！！！1

各位指点一下吧，自己顶起来！