[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？ )5U&^tJ  
一下是我的Prescription Data数据： +;Jb
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GENERAL LENS DATA: ggUJ -M'2h  
tc'`4O]c8  
Surfaces                :                3 xA9{o+  
Stop                    :                1 p}NIZ)]$  
System Aperture         : Object Space NA = 0.12 I2=?H<  
Glass Catalogs          : Schott N
Q@."8  
Ray Aiming              : Paraxial Reference, Cache On X,<n|zp  
X Pupil shift          :               0 it~>)_7*P  
Y Pupil shift          :               0 6 ztM(2[  
Z Pupil shift          :               0 t*zBN!Wu_  
Apodization             : Gaussian, factor =   1.00000E+000 S&@uY#_(*T  
************************************************************* KS/1ux4x  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) 6*/o  
Effective Focal Length  :        1.639158 (in image space) DM%4V|F"  
************************************************************* nkp!kqJ09  
Back Focal Length       :       -1.061568 L+PrV y  
Total Track             :           4.318 )0P>
o]fWI  
Image Space F/#         :        3.417255 i!30f^9D-S  
Paraxial Working F/#    :        2.950535 L s=2!  
Working F/#             :        2.961912 <=*xwI&q  
Image Space NA          :       0.1670788 &zr..i4O  
Object Space NA         :            0.12 c"3 a
,&  
Stop Radius             :       0.2398355 *1}'ZEaJ  
Paraxial Image Height   :               0 I"^ `!8<q  
Paraxial Magnification  :               0 PYl(~Vac  
Entrance Pupil Diameter :       0.4796709 b<B|p|  
Entrance Pupil Position :               0 VGY#ph%  
Exit Pupil Diameter     :        2.511155 37wm[Z  
Exit Pupil Position     :        7.420935 A|V |vT7cb  
Field Type              : Angle in degrees Pgs^#(^>  
Maximum Field           :               0 tdn[]|=  
Primary Wave            :            1.31 =!'gV:M  
Lens Units              :   Millimeters YB h:  
Angular Magnification   :               0 }MDuQP]  
n)w@\Uyc  
Fields          : 1 h*f=  
Field Type: Angle in degrees /s>ZT8vaAs  
#        X-Value        Y-Value         Weight qTnfiYG}  
1       0.000000       0.000000       1.000000 zlmb_akJ  
'Lft\.C  
Vignetting Factors AfG!(AF`  
#       VDX       VDY       VCX       VCY       VAN |*0oz=  
1  0.000000  0.000000  0.000000  0.000000  0.000000 `Njv#K} U  
1o7 pMp=  
Wavelengths     : 1 AAkdwo  
Units: Microns zm}4=Kz}  
#          Value         Weight %Ysu613mz  
1       1.310000       1.000000 2P8JLT*Tj  
$Xw .iN]g  
CARDINAL POINTS: (u-i{<   
m&DDz+g  
Object space positions are measured with respect to surface 1. Pq~"`-h7:  
Image space positions are measured with respect to the image surface. <L@0w8i`  
The index in both the object space and image space is considered. '}*5ee](S  
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                          Object Space         Image Space 9}Tf9>qP>M  
W = 1.310000 (Primary) 4`G":nE?We  
************************************************************ lcij}-z:%e  
Focal Length          :           -1.639015            1.639015 '+NmHu:q  
************************************************************ +I#5?  
Focal Planes          :            0.313078           -1.159568 e =V
u;  
Principal Planes      :            1.952094           -2.798584 G6xdGUM  
Anti-Principal Planes :           -1.325937            0.479447 J4h7] qt  
Nodal Planes          :            1.952094           -2.798584 ho2o/>Ef3  
Anti-Nodal Planes     :           -1.325937            0.479447 Y'-BKZv!  
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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