[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？ n]6'!Eo  
一下是我的Prescription Data数据： Qw_uwQZ)  
GENERAL LENS DATA: >-c?+oy  
pYcs4f!?p  
Surfaces                :                3 zgFL/a<  
Stop                    :                1 cQ1[x>OcU  
System Aperture         : Object Space NA = 0.12 "PMJh3q  
Glass Catalogs          : Schott & *tL)qKDc  
Ray Aiming              : Paraxial Reference, Cache On dQ;8,JzIw&  
X Pupil shift          :               0 0Fkr3x  
Y Pupil shift          :               0 [+FiD  
Z Pupil shift          :               0 1Z0Qkd(  
Apodization             : Gaussian, factor =   1.00000E+000 gjsks(x  
************************************************************* wMk
Hx3XD  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) 1E$\&*(  
Effective Focal Length  :        1.639158 (in image space) =WUNBav  
************************************************************* ,i6U*  
Back Focal Length       :       -1.061568 pcv\|)&}  
Total Track             :           4.318 ,$!F,
c  
Image Space F/#         :        3.417255 PM!JjMeQh  
Paraxial Working F/#    :        2.950535 0(o2<d7  
Working F/#             :        2.961912 nt"\FZ*;3  
Image Space NA          :       0.1670788 S?Cd,WxT  
Object Space NA         :            0.12 0vEQgx>  
Stop Radius             :       0.2398355 F&`%L#s|  
Paraxial Image Height   :               0 }!xc@
 
Paraxial Magnification  :               0 5OPvy,e6  
Entrance Pupil Diameter :       0.4796709 'hu'}F{  
Entrance Pupil Position :               0 +PBl3  
Exit Pupil Diameter     :        2.511155 1 jLQij  
Exit Pupil Position     :        7.420935 k@9hth2Q  
Field Type              : Angle in degrees Tcv/EST  
Maximum Field           :               0 E<D^j^T  
Primary Wave            :            1.31 N MkOx$  
Lens Units              :   Millimeters 9e.v[K~  
Angular Magnification   :               0 qsEFf(9G  
Dy5&-yk  
Fields          : 1 },X.a@:  
Field Type: Angle in degrees N G vb]  
#        X-Value        Y-Value         Weight y%9Hu
  
1       0.000000       0.000000       1.000000 QeT~s5 H  
2f{p$YIt  
Vignetting Factors 1Z?uT[kR  
#       VDX       VDY       VCX       VCY       VAN ` >>]$ZJ  
1  0.000000  0.000000  0.000000  0.000000  0.000000 S@[NKY  
B*)mHSs2  
Wavelengths     : 1 ts@w9|  
Units: Microns %
<8?$-[  
#          Value         Weight zrA3bWs  
1       1.310000       1.000000 ~233{vh$=>  
;y7+Q  
CARDINAL POINTS: 3xRn  
ci+ajON  
Object space positions are measured with respect to surface 1. U:@tdH+A7  
Image space positions are measured with respect to the image surface. *Cp:
<Mnd  
The index in both the object space and image space is considered. DD  
^} Y}Iz  
                          Object Space         Image Space PYNY1|3  
W = 1.310000 (Primary) ;FuST  
************************************************************ KbciRRf!k  
Focal Length          :           -1.639015            1.639015 6)ysiAH?  
************************************************************ U)iBeYW:  
Focal Planes          :            0.313078           -1.159568 zRgGSxn  
Principal Planes      :            1.952094           -2.798584 FWp ?l  
Anti-Principal Planes :           -1.325937            0.479447 I\-M`^@  
Nodal Planes          :            1.952094           -2.798584 O`!XW8  
Anti-Nodal Planes     :           -1.325937            0.479447 dEI!r1~n  
YIIc@)  
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