[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？ \ua9thO
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一下是我的Prescription Data数据： G i$  
GENERAL LENS DATA: \z2vV+f  
G!AICcP^  
Surfaces                :                3 }j&O/Up  
Stop                    :                1 0Wa#lkn$I  
System Aperture         : Object Space NA = 0.12 q A.+U:I8  
Glass Catalogs          : Schott kJ/+IGV^v  
Ray Aiming              : Paraxial Reference, Cache On [fd~nD#.  
X Pupil shift          :               0 6!*K/2:O  
Y Pupil shift          :               0 bAUHUPe  
Z Pupil shift          :               0 y@q1c*|  
Apodization             : Gaussian, factor =   1.00000E+000 @=CLeQG`  
************************************************************* X)I/%{  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) C=8H)Ef,l  
Effective Focal Length  :        1.639158 (in image space) ]OUD5T  
************************************************************* pH^ z  
Back Focal Length       :       -1.061568 ldP3n:7FS  
Total Track             :           4.318 ,bxz]S1W  
Image Space F/#         :        3.417255 yj>){NcX  
Paraxial Working F/#    :        2.950535 HTw#U2A;+  
Working F/#             :        2.961912 W^wd ([  
Image Space NA          :       0.1670788 OthG7+eF  
Object Space NA         :            0.12 'HCnB]1  
Stop Radius             :       0.2398355 X+@s]  
Paraxial Image Height   :               0 8`a,D5U:  
Paraxial Magnification  :               0 ) 9xX  
Entrance Pupil Diameter :       0.4796709 /GyEVCc  
Entrance Pupil Position :               0 $kv@tzO  
Exit Pupil Diameter     :        2.511155 2,+d|1(4o  
Exit Pupil Position     :        7.420935 3zbXAR*  
Field Type              : Angle in degrees 3=IG#6)~C  
Maximum Field           :               0 6I"C~&dt  
Primary Wave            :            1.31 FbmsN)mv!%  
Lens Units              :   Millimeters xwi!:PAf,o  
Angular Magnification   :               0 D
]jkR} t  
RTZ:U@  
Fields          : 1 TKd6MZhT  
Field Type: Angle in degrees w\p9J0  
#        X-Value        Y-Value         Weight  C[R`Ml  
1       0.000000       0.000000       1.000000 \,hrk~4U;(  
p x0Sy
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Vignetting Factors Xty#vI  
#       VDX       VDY       VCX       VCY       VAN 6vF/e#},  
1  0.000000  0.000000  0.000000  0.000000  0.000000 QsM*wT&aa  
Jb9F=s+  
Wavelengths     : 1 UP?D@
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Units: Microns K\~v&  
#          Value         Weight Rh[Ibm56  
1       1.310000       1.000000 $3]b>v  
)Y~xIj>  
CARDINAL POINTS: XO%~6Us^  
Y|:YrZSC  
Object space positions are measured with respect to surface 1. :SK<2<8h  
Image space positions are measured with respect to the image surface. (U_wp's  
The index in both the object space and image space is considered. ![).zi+m  
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                          Object Space         Image Space Fav^^vf*1  
W = 1.310000 (Primary) rpSr^slr  
************************************************************ UP]1(S?  
Focal Length          :           -1.639015            1.639015 KXq_K:r?  
************************************************************ -<PC"B  
Focal Planes          :            0.313078           -1.159568
g#|oif9o  
Principal Planes      :            1.952094           -2.798584 e62y  
Anti-Principal Planes :           -1.325937            0.479447 xG8`'SNY  
Nodal Planes          :            1.952094           -2.798584 C 0>=x{,v  
Anti-Nodal Planes     :           -1.325937            0.479447 jWSb5#Pw  
WcU@~05b  
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