[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？ uQ ]ZMc  
一下是我的Prescription Data数据： ^Et^,I:`  
GENERAL LENS DATA: asQ^33g z  
"\lOOp^-  
Surfaces                :                3 Bvj  
Stop                    :                1 nql{k/6  
System Aperture         : Object Space NA = 0.12 s{c|J#s  
Glass Catalogs          : Schott mxH63$R  
Ray Aiming              : Paraxial Reference, Cache On Rc93Fb-Zp  
X Pupil shift          :               0 #xR=U"  
Y Pupil shift          :               0 @G>eCj  
Z Pupil shift          :               0 5%K|dYv^^  
Apodization             : Gaussian, factor =   1.00000E+000 d=\TC'd"{  
************************************************************* Z6So5r%wZ  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) CZ^ ,bad  
Effective Focal Length  :        1.639158 (in image space)  `uDOIl  
************************************************************* B$OV^iwxK  
Back Focal Length       :       -1.061568 h0x'QiCc  
Total Track             :           4.318 Q
Xa2qxTc  
Image Space F/#         :        3.417255 /Aw@26  
Paraxial Working F/#    :        2.950535 dBM{]@bZ  
Working F/#             :        2.961912 <Pf4[q&wM  
Image Space NA          :       0.1670788 # dUi['  
Object Space NA         :            0.12 r|z B?9Q  
Stop Radius             :       0.2398355 0e:j=kd)NH  
Paraxial Image Height   :               0 0<<ATw$aQ  
Paraxial Magnification  :               0 hVz]',  
Entrance Pupil Diameter :       0.4796709 )2^r 0(x  
Entrance Pupil Position :               0 all2?neK  
Exit Pupil Diameter     :        2.511155 L[5U(`q[  
Exit Pupil Position     :        7.420935 WK0IagYw  
Field Type              : Angle in degrees +~1
FKLu  
Maximum Field           :               0 Y~r)WV!G  
Primary Wave            :            1.31 zt  
Lens Units              :   Millimeters ww+,GnV  
Angular Magnification   :               0 |rgPHRX^Hn  
N3)n**  
Fields          : 1 EZp >Cf7  
Field Type: Angle in degrees fG8^|:  
#        X-Value        Y-Value         Weight oOLj? 0t  
1       0.000000       0.000000       1.000000 BEAY}P(y3  
T`u ,!S
 
Vignetting Factors |NTqJ j  
#       VDX       VDY       VCX       VCY       VAN [1Qg
*   
1  0.000000  0.000000  0.000000  0.000000  0.000000 szqR1A  
w}97`.Kt!n  
Wavelengths     : 1 DHvZ:)aT}  
Units: Microns ?oV|.LM:W  
#          Value         Weight 5]kv1nQ  
1       1.310000       1.000000 nb*`GE  
4,=;:#n,J  
CARDINAL POINTS: +sq_fd ;'D  
qjg Z

 
Object space positions are measured with respect to surface 1. #op0|:/

N  
Image space positions are measured with respect to the image surface. xlsAct:  
The index in both the object space and image space is considered. z63
y8  
7?vj+1;  
                          Object Space         Image Space & \C1QkI  
W = 1.310000 (Primary) yI-EF)A@;  
************************************************************ pUu<0a^  
Focal Length          :           -1.639015            1.639015 >I;.q|T  
************************************************************ iJKGzHvS  
Focal Planes          :            0.313078           -1.159568 Nn?$}
g  
Principal Planes      :            1.952094           -2.798584 yKz%-6cpSl  
Anti-Principal Planes :           -1.325937            0.479447 ,sg\K>H=  
Nodal Planes          :            1.952094           -2.798584 V8pZr+AJ  
Anti-Nodal Planes     :           -1.325937            0.479447  Oe "%v;-  
9.9B#?  
我用*号，标出了需要注意的地方，请高手指教！

慢慢理解

我也不会先看看再说!~

看的我头晕了,可能是感冒的缘故吧,以后有机会再探讨

等待高手帮忙吧 我也不会!

帮顶！！！！！！！！！！！！！！1

各位指点一下吧，自己顶起来！