[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？ Cdc6<8  
一下是我的Prescription Data数据： Uq7 y4zJ  
GENERAL LENS DATA: m"NZ;*d'  
9"oc.ue.2D  
Surfaces                :                3 OLlNCb#t  
Stop                    :                1 <kt,aMw[*  
System Aperture         : Object Space NA = 0.12 z6$W@-Vd  
Glass Catalogs          : Schott ?-Fp rC  
Ray Aiming              : Paraxial Reference, Cache On F+|zCEc  
X Pupil shift          :               0 wS#.Wzp.w  
Y Pupil shift          :               0 (@~d9PvB>  
Z Pupil shift          :               0 dtr8u  
Apodization             : Gaussian, factor =   1.00000E+000 YcT!`B  
************************************************************* RD<l<+C^~  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) 0d~>zKho  
Effective Focal Length  :        1.639158 (in image space) <S%M*j  
************************************************************* #"=_GA^.{  
Back Focal Length       :       -1.061568 h]&8hl_'m  
Total Track             :           4.318 IA!( 'K
s  
Image Space F/#         :        3.417255 Kr!8H/Z
  
Paraxial Working F/#    :        2.950535 @u#Tx%  
Working F/#             :        2.961912 #O* ytZ  
Image Space NA          :       0.1670788 L@X
hgQ  
Object Space NA         :            0.12 Jn-iIl  
Stop Radius             :       0.2398355 hU@9vU<U  
Paraxial Image Height   :               0 C|8.$s<  
Paraxial Magnification  :               0 Y]Td+Zi  
Entrance Pupil Diameter :       0.4796709  5k{a(I  
Entrance Pupil Position :               0 w-pdpbHV  
Exit Pupil Diameter     :        2.511155 wz<
YflF  
Exit Pupil Position     :        7.420935 s`U.h^V  
Field Type              : Angle in degrees }mzM'9JH  
Maximum Field           :               0 g`k_o<'JC  
Primary Wave            :            1.31 ORD@+ {  
Lens Units              :   Millimeters xQ=[0!p+  
Angular Magnification   :               0 |]w0ytL>(2  
.A//Q|ot!  
Fields          : 1 I6ffp!^}Y  
Field Type: Angle in degrees *2Il{KOA^  
#        X-Value        Y-Value         Weight 17 Hdj  
1       0.000000       0.000000       1.000000 JL=MlZ  
c%n[v3]  
Vignetting Factors :$lx]  
#       VDX       VDY       VCX       VCY       VAN 9X/c%:)\=  
1  0.000000  0.000000  0.000000  0.000000  0.000000 < {$zOF}  
Xkk m~sM6  
Wavelengths     : 1 Ox#%Dm2  
Units: Microns m_wBRan  
#          Value         Weight n(\5Z&  
1       1.310000       1.000000 E=+v1\t)]  
]#z^G  
CARDINAL POINTS: *"2TT})  
ov.7FZ+
 
Object space positions are measured with respect to surface 1. fH-V!QY
GF  
Image space positions are measured with respect to the image surface. ep* (  
The index in both the object space and image space is considered. D7T(B=S6  
p)NhV  
                          Object Space         Image Space 8wKF.+_A  
W = 1.310000 (Primary) ),1MR=  
************************************************************ [Dni>2@0  
Focal Length          :           -1.639015            1.639015 j?K]0j;  
************************************************************ ()i8 Qepo}  
Focal Planes          :            0.313078           -1.159568 OsAH!e  
Principal Planes      :            1.952094           -2.798584 jl YnV/ ]  
Anti-Principal Planes :           -1.325937            0.479447 Ke@zS9  
Nodal Planes          :            1.952094           -2.798584 $$_aHkI j  
Anti-Nodal Planes     :           -1.325937            0.479447 SO^:6GuJ  
)>abB?RZ  
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