ZEMAX中priscription data會(huì)給出系統(tǒng)的許多有用的數(shù)據(jù)，其中包括effective focal length的數(shù)據(jù)和主平面位置的數(shù)據(jù)。但是我發(fā)現(xiàn)直接給出的effective focal length數(shù)據(jù)和根據(jù)其定義結(jié)合主平面的數(shù)據(jù)算出來的結(jié)果不一致，這時(shí)怎么回事？ Te2C<c  
一下是我的Prescription Data數(shù)據(jù)： =A{s,UP  
GENERAL LENS DATA: %E2V$l0  
21[=xboU  
Surfaces                :                3 8_/,`}9   
Stop                    :                1 .<4U2h  
System Aperture         : Object Space NA = 0.12 xSrjN  
Glass Catalogs          : Schott `Z^\<{z  
Ray Aiming              : Paraxial Reference, Cache On Y1G/1Z# 2  
X Pupil shift          :               0 QjOY1Xze  
Y Pupil shift          :               0 bF'Jm*f  
Z Pupil shift          :               0 L$6W,D  
Apodization             : Gaussian, factor =   1.00000E+000 ,!dVhG#  
************************************************************* J p)I9k,Ez  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) aGNbCm  
Effective Focal Length  :        1.639158 (in image space) V3(8?Fz.  
************************************************************* J,:Wv`N:9~  
Back Focal Length       :       -1.061568 |j=Pj)5J  
Total Track             :           4.318 [ji')PCAi;  
Image Space F/#         :        3.417255 aC94g7)`  
Paraxial Working F/#    :        2.950535 CsEU:v  
Working F/#             :        2.961912 e$7KMH=  
Image Space NA          :       0.1670788 VS3lz?o?6g  
Object Space NA         :            0.12 OlP1Zd/l  
Stop Radius             :       0.2398355 p z\8Bp}yo  
Paraxial Image Height   :               0 HCT+.n6  
Paraxial Magnification  :               0 '^`iF,rg  
Entrance Pupil Diameter :       0.4796709 t;V^OGflv  
Entrance Pupil Position :               0 ?[;>1+D  
Exit Pupil Diameter     :        2.511155 7(d#zu6n  
Exit Pupil Position     :        7.420935 5Od&-~O  
Field Type              : Angle in degrees 0#CmB4!<O  
Maximum Field           :               0 mVEIHzk2b  
Primary Wave            :            1.31 ,