[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？ DDQx g  
一下是我的Prescription Data数据： >dXGee>'M  
GENERAL LENS DATA: L<c4kw  
rw[ph[\X  
Surfaces                :                3 W ~<^L\Lu  
Stop                    :                1 $GV7o{"&  
System Aperture         : Object Space NA = 0.12 zC:ASt  
Glass Catalogs          : Schott !<|4C6X:4  
Ray Aiming              : Paraxial Reference, Cache On Y>z>11yEB0  
X Pupil shift          :               0 ZmqKQO  
Y Pupil shift          :               0 ]OhiYU4  
Z Pupil shift          :               0 &A/]pi-\  
Apodization             : Gaussian, factor =   1.00000E+000 /V8#[9K  
************************************************************* Oxnp0 s  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) G&SB-  
Effective Focal Length  :        1.639158 (in image space) .8g)av+  
************************************************************* of~4Q{f$6  
Back Focal Length       :       -1.061568 2>9C-VL2  
Total Track             :           4.318 Y|m+dT6  
Image Space F/#         :        3.417255 *-WpZGh  
Paraxial Working F/#    :        2.950535 *U-4Sy  
Working F/#             :        2.961912 h8j.(  
Image Space NA          :       0.1670788 mM~qBrwL  
Object Space NA         :            0.12 Mexk~zA^  
Stop Radius             :       0.2398355 t,Lrfv])  
Paraxial Image Height   :               0 T"Y+m-<%  
Paraxial Magnification  :               0 fm%t^)E  
Entrance Pupil Diameter :       0.4796709 LrfVh-}|:Y  
Entrance Pupil Position :               0 BR_1MG'{)$  
Exit Pupil Diameter     :        2.511155 r r %V.r;2  
Exit Pupil Position     :        7.420935 &AMl:@p9  
Field Type              : Angle in degrees
f%JIp#B  
Maximum Field           :               0 H'5)UX@LP  
Primary Wave            :            1.31 G't$Qx,IC  
Lens Units              :   Millimeters yN0Vr\r2  
Angular Magnification   :               0 5pG}Yk_(x  
5ta `%R_  
Fields          : 1 w/<L Ag  
Field Type: Angle in degrees gaxsv[W>^  
#        X-Value        Y-Value         Weight ja'T+!k  
1       0.000000       0.000000       1.000000 NYUL:Tp  
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s&71a  
Vignetting Factors ~At7 +F[  
#       VDX       VDY       VCX       VCY       VAN (Rh,,  
1  0.000000  0.000000  0.000000  0.000000  0.000000 u#fM_>ML  
c]-<vkpV  
Wavelengths     : 1 6v!`1} ~  
Units: Microns /HE
w-M9z  
#          Value         Weight UgRiIQMq.  
1       1.310000       1.000000 <nf@U>wlw  
Paq4  
CARDINAL POINTS: M?49TOQA  
qo~O|~  
Object space positions are measured with respect to surface 1. +E+p"7  
Image space positions are measured with respect to the image surface. 2s8a $3  
The index in both the object space and image space is considered. qwcD`HV,  
]cvwIc">  
                          Object Space         Image Space *Q
.>-J<S  
W = 1.310000 (Primary) CW K7wZM  
************************************************************ P;no?  
Focal Length          :           -1.639015            1.639015 a!SiX  
************************************************************ <=&`ZH  
Focal Planes          :            0.313078           -1.159568 dQX6(Jj  
Principal Planes      :            1.952094           -2.798584 klYX7?  
Anti-Principal Planes :           -1.325937            0.479447 8d{0rqwNE  
Nodal Planes          :            1.952094           -2.798584 U>SShpmZA  
Anti-Nodal Planes     :           -1.325937            0.479447 T<>,lQs(a  
z6P$pqyF  
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