[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？ wm$1LZ8o-`  
一下是我的Prescription Data数据： 4nfpPNt  
GENERAL LENS DATA: gdu8O!9)  
$ {iV]Xt  
Surfaces                :                3 $:#{Y;d  
Stop                    :                1 <9]9;  
System Aperture         : Object Space NA = 0.12 e*7nq~ B5  
Glass Catalogs          : Schott &3SQVOW ~T  
Ray Aiming              : Paraxial Reference, Cache On u7oHqo`  
X Pupil shift          :               0 SOq{`~,4B  
Y Pupil shift          :               0 xMAfa>]{n  
Z Pupil shift          :               0 :
+9KNyA  
Apodization             : Gaussian, factor =   1.00000E+000 | Vtd!9  
************************************************************* x2|YrkGv  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) JP2zom  
Effective Focal Length  :        1.639158 (in image space) FZW)C'j  
************************************************************* t4a/\{/#9|  
Back Focal Length       :       -1.061568 qH3|x08  
Total Track             :           4.318 BrdHTk= Vy  
Image Space F/#         :        3.417255 `kn 'RZR  
Paraxial Working F/#    :        2.950535 L"w% ew  
Working F/#             :        2.961912 GWNLET  
Image Space NA          :       0.1670788 x:h0/f  
Object Space NA         :            0.12 +J^-B}v  
Stop Radius             :       0.2398355 ]}3AP!:  
Paraxial Image Height   :               0 p97}HT}  
Paraxial Magnification  :               0 . C g2Y  
Entrance Pupil Diameter :       0.4796709 :|s!_G<  
Entrance Pupil Position :               0 w"Q6'/P  
Exit Pupil Diameter     :        2.511155 D;pfogK @  
Exit Pupil Position     :        7.420935 ^^u{W|'CaH  
Field Type              : Angle in degrees s~@4  
Maximum Field           :               0 h}X^  
Primary Wave            :            1.31 )%4%Uo_Xm  
Lens Units              :   Millimeters $*035f  
Angular Magnification   :               0 F__j]}?  
Osb#<
9{}  
Fields          : 1 ^ |k7g  
Field Type: Angle in degrees e/pZLj]M  
#        X-Value        Y-Value         Weight 8X6F6RK6,1  
1       0.000000       0.000000       1.000000 _vQtV]  
p)5j~Nl  
Vignetting Factors MZyzc{c,  
#       VDX       VDY       VCX       VCY       VAN wA+QUN3#n  
1  0.000000  0.000000  0.000000  0.000000  0.000000 Hm>M}MF3  
sD|P*ir  
Wavelengths     : 1 #J1vN]g  
Units: Microns z=}@aX[  
#          Value         Weight v"y0D  
1       1.310000       1.000000 n+C]&6-b  
mE`OG8  
CARDINAL POINTS: ze+_iQ5  
E?{{z4  
Object space positions are measured with respect to surface 1. ?-40bb  
Image space positions are measured with respect to the image surface. Pc+8CuN?  
The index in both the object space and image space is considered. k 8C[fRev  
Ck71N3~W  
                          Object Space         Image Space %\5w
HT+)  
W = 1.310000 (Primary) ra="4T$va  
************************************************************ y\=(;]S'  
Focal Length          :           -1.639015            1.639015 l98.Hb7  
************************************************************ >/*wlY!E  
Focal Planes          :            0.313078           -1.159568 !H,_*u.  
Principal Planes      :            1.952094           -2.798584 T=/GFg'  
Anti-Principal Planes :           -1.325937            0.479447 I9sx*'  
Nodal Planes          :            1.952094           -2.798584 -Wp69DP6q  
Anti-Nodal Planes     :           -1.325937            0.479447 6`/nA4S4.  
*h+@a  
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