[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？ 4*n1Xu7^x  
一下是我的Prescription Data数据： o{2B^@+Vb  
GENERAL LENS DATA: #RdcSrw)W!  
;$*tn"- ?~  
Surfaces                :                3 K^/.v<w  
Stop                    :                1 2c,w 4rK  
System Aperture         : Object Space NA = 0.12 P$O@G$n  
Glass Catalogs          : Schott Vw.4;Zy(  
Ray Aiming              : Paraxial Reference, Cache On CJ3/8*;w  
X Pupil shift          :               0 q?w%%.9]X  
Y Pupil shift          :               0 8SiWAOQAL  
Z Pupil shift          :               0 a*,V\l|6  
Apodization             : Gaussian, factor =   1.00000E+000 :E|+[}|  
************************************************************* !}eq~3  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) ]RVme^=  
Effective Focal Length  :        1.639158 (in image space) 6!U~dt#a  
************************************************************* "|WKK}  
Back Focal Length       :       -1.061568 K(NP%:  
Total Track             :           4.318 |jWA >S  
Image Space F/#         :        3.417255 :K \IS`  
Paraxial Working F/#    :        2.950535 2C_I3S~U  
Working F/#             :        2.961912 :W'.SRD  
Image Space NA          :       0.1670788 vMXn#eR  
Object Space NA         :            0.12 T
z(Dhb,  
Stop Radius             :       0.2398355 ZE/Aj/7Qy  
Paraxial Image Height   :               0 xnZ  
Paraxial Magnification  :               0 85H*Xm?d#  
Entrance Pupil Diameter :       0.4796709 hg^klQD  
Entrance Pupil Position :               0 ccW{88II7w  
Exit Pupil Diameter     :        2.511155 
5tVg++I  
Exit Pupil Position     :        7.420935 x;7p75Wm  
Field Type              : Angle in degrees #KLW&A  
Maximum Field           :               0 } f!wQxb  
Primary Wave            :            1.31 ,+5!1>\  
Lens Units              :   Millimeters +jGUp\h%9;  
Angular Magnification   :               0 ^'vWv C  
>ZAn2s  
Fields          : 1 XQ Si  
Field Type: Angle in degrees >BMtR0
  
#        X-Value        Y-Value         Weight lzz68cT  
1       0.000000       0.000000       1.000000 y0t-e  
U`4t4CHA  
Vignetting Factors rqM_#[Y?  
#       VDX       VDY       VCX       VCY       VAN yAJrdY"  
1  0.000000  0.000000  0.000000  0.000000  0.000000 QSo48OFs  
I\82_t8  
Wavelengths     : 1 cc3+Wx_  
Units: Microns 7ws[Rp8  
#          Value         Weight S.fb[gI]  
1       1.310000       1.000000 *^%ohCUi  
1Dm$:),^T}  
CARDINAL POINTS: *pGbcB
Q  
J\ 
?  
Object space positions are measured with respect to surface 1. n*qn8Dq  
Image space positions are measured with respect to the image surface. G7HvA46  
The index in both the object space and image space is considered. p#dYNed]'  
#fF';Y7  
                          Object Space         Image Space V#-8[G6Ra  
W = 1.310000 (Primary) }4*~*NoQ  
************************************************************ ^+dL7g?+  
Focal Length          :           -1.639015            1.639015 )}\J   
************************************************************ M0MvOO*ad  
Focal Planes          :            0.313078           -1.159568 W%}zwQ  
Principal Planes      :            1.952094           -2.798584 Kx,<-]4  
Anti-Principal Planes :           -1.325937            0.479447 ?CuwA-j  
Nodal Planes          :            1.952094           -2.798584 z`y^o*qc]  
Anti-Nodal Planes     :           -1.325937            0.479447 R?kyJ4S  
]*AQT7PH  
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