[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？ LasH[:QQQ  
一下是我的Prescription Data数据： H5s85"U#  
GENERAL LENS DATA: ;Kf|a}m-  
vdm?d/0(^  
Surfaces                :                3 X*"Kg  
Stop                    :                1 *r`Yz}  
System Aperture         : Object Space NA = 0.12 4I
-p/&Q  
Glass Catalogs          : Schott ^kr)U8  
Ray Aiming              : Paraxial Reference, Cache On p*0Ve21i,  
X Pupil shift          :               0 j''Iai_  
Y Pupil shift          :               0 i .N1Cvp&  
Z Pupil shift          :               0 #%9]Lq  
Apodization             : Gaussian, factor =   1.00000E+000 2eU[*x  
************************************************************* lX*;KHT)  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) o"FiM5L^.  
Effective Focal Length  :        1.639158 (in image space) {^W,e ^:  
************************************************************* skz]@{38  
Back Focal Length       :       -1.061568 f~FehN7  
Total Track             :           4.318 `z_7[$\~  
Image Space F/#         :        3.417255 m0Syxb  
Paraxial Working F/#    :        2.950535 O->eg  
Working F/#             :        2.961912 ak) -OL1  
Image Space NA          :       0.1670788 z#VpS=  
Object Space NA         :            0.12 p'uz2
/g  
Stop Radius             :       0.2398355 @;fE%N  
Paraxial Image Height   :               0 igrog  
Paraxial Magnification  :               0 }4]<P  
Entrance Pupil Diameter :       0.4796709 el?V2v[  
Entrance Pupil Position :               0 DME?kh>7  
Exit Pupil Diameter     :        2.511155 nV3 7` I  
Exit Pupil Position     :        7.420935 A+*oT(`  
Field Type              : Angle in degrees LU,"i^
T  
Maximum Field           :               0 {p|%hhTK%  
Primary Wave            :            1.31 ms7 7{A3  
Lens Units              :   Millimeters NNwd;AC  
Angular Magnification   :               0 ^<\} Y  
'$XHRS/q]  
Fields          : 1 Bh,)5E^m  
Field Type: Angle in degrees (?BgT i\  
#        X-Value        Y-Value         Weight =>0M3 Qh{  
1       0.000000       0.000000       1.000000 I'9s=~VfY,  
8Wx@[!  
Vignetting Factors {[5L96RH%  
#       VDX       VDY       VCX       VCY       VAN _S2^;n?  
1  0.000000  0.000000  0.000000  0.000000  0.000000 :6$4K"^1  
=)- Q?1q  
Wavelengths     : 1 (}X?v`Y^W  
Units: Microns $xtE+EV.p  
#          Value         Weight "qTC(F9N$.  
1       1.310000       1.000000 "QO/Jls  
[Z#.]g
b  
CARDINAL POINTS: e( o/we{  
~}
IvY?!;  
Object space positions are measured with respect to surface 1. C^" Hj  
Image space positions are measured with respect to the image surface. bsi q9$F  
The index in both the object space and image space is considered. ]jVSsSv  
NhK(HTsvK  
                          Object Space         Image Space As'M39*V  
W = 1.310000 (Primary) Q^Z<RA(C  
************************************************************ [du>ff  
Focal Length          :           -1.639015            1.639015 >3`ctbe  
************************************************************ te*Y]-&I|/  
Focal Planes          :            0.313078           -1.159568 q9brpbg_  
Principal Planes      :            1.952094           -2.798584 5Ue^>8-  
Anti-Principal Planes :           -1.325937            0.479447 3.<6;?  
Nodal Planes          :            1.952094           -2.798584 +Bq}>  
Anti-Nodal Planes     :           -1.325937            0.479447 :gD0EqV  
jqGo-C~  
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