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(lái)的結(jié)果不一致，這時(shí)怎么回事？ 7rjl-FUA~  
一下是我的Prescription Data數(shù)據(jù)： ]8p{A#1  
GENERAL LENS DATA: =w$&n%~  
{[H_Vl@  
Surfaces                :                3 | &X<-  
Stop                    :                1 *dBeb  
System Aperture         : Object Space NA = 0.12 F9r.DG$}  
Glass Catalogs          : Schott ],]Rv#`  
Ray Aiming              : Paraxial Reference, Cache On %B%_[<B  
X Pupil shift          :               0 cJo%j -AM  
Y Pupil shift          :               0 /Y0~BQC7!  
Z Pupil shift          :               0 0?7yM:!l  
Apodization             : Gaussian, factor =   1.00000E+000 -n _Y.~  
************************************************************* H/D=$)3op  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) P<]U  
Effective Focal Length  :        1.639158 (in image space) t+?Bb7p,H  
************************************************************* N<)CG,/w[M  
Back Focal Length       :       -1.061568 M)bQvjj  
Total Track             :           4.318 FuHBzBoM=  
Image Space F/#         :        3.417255 ';I}6N  
Paraxial Working F/#    :        2.950535 X7*F~LFrj  
Working F/#             :        2.961912 ~apt,hl  
Image Space NA          :       0.1670788 E|@C:ghG  
Object Space NA         :            0.12 bY~K)j v3&  
Stop Radius             :       0.2398355 |bnd92fvks  
Paraxial Image Height   :               0 )d3 09O  
Paraxial Magnification  :               0 :5k* kx#y  
Entrance Pupil Diameter :       0.4796709 ;(NTzBq!1  
Entrance Pupil Position :               0 fCY|iO0.t  
Exit Pupil Diameter     :        2.511155 |;gx;qp4cN  
Exit Pupil Position     :        7.420935 z9o]
);dZ  
Field Type              : Angle in degrees uN%C
c12  
Maximum Field           :               0 x"2p5T7*>  
Primary Wave            :            1.31 K"!rj.Da  
Lens Units              :   Millimeters aq?bI:>8  
Angular Magnification   :               0 tiK M+ ;C  
xQFRM aQE  
Fields          : 1 B7\4^6T
x  
Field Type: Angle in degrees gfL