[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？ {t4':{Y+  
一下是我的Prescription Data数据：
z:N?T0b(  
GENERAL LENS DATA: @Z7s3b  
p.<d+S<  
Surfaces                :                3 eA3NyL  
Stop                    :                1 *N
M*
 
System Aperture         : Object Space NA = 0.12 zlB[Eg^X  
Glass Catalogs          : Schott 4uh~@Lv  
Ray Aiming              : Paraxial Reference, Cache On {u0sbb(  
X Pupil shift          :               0 APJFy@l}  
Y Pupil shift          :               0 /cVZ/"  
Z Pupil shift          :               0 s0CDp"uJY  
Apodization             : Gaussian, factor =   1.00000E+000 [,;O$j}  
************************************************************* Y9 Bk$$#\  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) YE:5'@Z  
Effective Focal Length  :        1.639158 (in image space) hhhxsGyv  
************************************************************* 4#t=%}  
Back Focal Length       :       -1.061568 [w-# !X2y  
Total Track             :           4.318 r
[^O 7  
Image Space F/#         :        3.417255 D><^7nr%  
Paraxial Working F/#    :        2.950535 82V;J 8T?  
Working F/#             :        2.961912 ILiOEwHS7F  
Image Space NA          :       0.1670788 4/_!F'j  
Object Space NA         :            0.12 =EH/~NGk  
Stop Radius             :       0.2398355 L^PBcfg  
Paraxial Image Height   :               0 >6W#v[  
Paraxial Magnification  :               0 Qs?p)3qp  
Entrance Pupil Diameter :       0.4796709 W6r3v)~  
Entrance Pupil Position :               0 (=Oo=8\  
Exit Pupil Diameter     :        2.511155 sHV?njZd  
Exit Pupil Position     :        7.420935 Eg2SC?5
 
Field Type              : Angle in degrees }
7K~-
 
Maximum Field           :               0 D{qr N6g#  
Primary Wave            :            1.31 Zlt,Us`  
Lens Units              :   Millimeters jK%Lewq  
Angular Magnification   :               0 meXwmO  
g $^Yv4  
Fields          : 1 >5TXLOYZ  
Field Type: Angle in degrees YN7OQqa  
#        X-Value        Y-Value         Weight " YOl6n  
1       0.000000       0.000000       1.000000 U7e2NES  
9
l|*E  
Vignetting Factors f)V6VNW.3  
#       VDX       VDY       VCX       VCY       VAN m( %PZ*s  
1  0.000000  0.000000  0.000000  0.000000  0.000000 V&/Cb&~Uw  
b.8T<@a  
Wavelengths     : 1 (^_INy*  
Units: Microns tO D}&  
#          Value         Weight  [@3.dd  
1       1.310000       1.000000 i=hA. y`  
K(?p]wh  
CARDINAL POINTS: \.GA"_y  
"ub0}p4V  
Object space positions are measured with respect to surface 1. gNkBHwv  
Image space positions are measured with respect to the image surface. K$s{e0 79  
The index in both the object space and image space is considered. yt
V[x  
x2/ciC  
                          Object Space         Image Space 8o).q}>&  
W = 1.310000 (Primary) YUyYVi7clq  
************************************************************ QF22_D<.}J  
Focal Length          :           -1.639015            1.639015 H;DjM;be  
************************************************************ `=Bv+  
Focal Planes          :            0.313078           -1.159568 |TF6&$>d  
Principal Planes      :            1.952094           -2.798584 r Cz,XYV  
Anti-Principal Planes :           -1.325937            0.479447 5yj6MaqJ  
Nodal Planes          :            1.952094           -2.798584 92N`Q}  
Anti-Nodal Planes     :           -1.325937            0.479447 hvA|d=R(  
Q)8I(*  
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