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？ p5"pQeS  
一下是我的Prescription Data數(shù)據(jù)： #Mk3cp^Yl  
GENERAL LENS DATA: 8,F|*YA  
JPL`/WA0  
Surfaces                :                3 \HrtPm`e  
Stop                    :                1 v2r|)c,h
 
System Aperture         : Object Space NA = 0.12 n2_;:=  
Glass Catalogs          : Schott "J*>g(H53  
Ray Aiming              : Paraxial Reference, Cache On ?v:FGO  
X Pupil shift          :               0 HNc/p4z  
Y Pupil shift          :               0 <H#0pFB  
Z Pupil shift          :               0 0$b4\.0>~  
Apodization             : Gaussian, factor =   1.00000E+000 GJ`._ju  
************************************************************* d"E3ypPK  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) 7}MnvWP  
Effective Focal Length  :        1.639158 (in image space) a>-qHX-l  
************************************************************* O> _ F   
Back Focal Length       :       -1.061568 >S0kiGDV{
 
Total Track             :           4.318 __+8wC  
Image Space F/#         :        3.417255 4*o?2P$Q  
Paraxial Working F/#    :        2.950535 $e4N4e2x/  
Working F/#             :        2.961912 7;Lv_Y"b  
Image Space NA          :       0.1670788 |Vlx:  
Object Space NA         :            0.12
o7Z8O,;  
Stop Radius             :       0.2398355 gH,Pz  
Paraxial Image Height   :               0 |c2sJy