[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？ BhKxI  
一下是我的Prescription Data数据： _#_Ab8#  
GENERAL LENS DATA: N%-nxbI\  
uzo}?X#  
Surfaces                :                3 ZFzOW  
Stop                    :                1 {^qc
`oF  
System Aperture         : Object Space NA = 0.12 1/m/Iw@  
Glass Catalogs          : Schott h^s}8y  
Ray Aiming              : Paraxial Reference, Cache On n'gfB]H[  
X Pupil shift          :               0 efhwbn  
Y Pupil shift          :               0 ,]d}pJ}PX`  
Z Pupil shift          :               0 uO6_lOT9n  
Apodization             : Gaussian, factor =   1.00000E+000 =Yfs=+O  
************************************************************* Oe273Y^e  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure) ,[~EThcq  
Effective Focal Length  :        1.639158 (in image space) q8
oEb  
************************************************************* li{_biey}  
Back Focal Length       :       -1.061568 5Z:HCp-aG  
Total Track             :           4.318 oGM.{\i  
Image Space F/#         :        3.417255 5E@V@kw  
Paraxial Working F/#    :        2.950535 jK{MU) D+  
Working F/#             :        2.961912 @MM|.# ~T  
Image Space NA          :       0.1670788 WO{N
@f^  
Object Space NA         :            0.12 GA|q[<U  
Stop Radius             :       0.2398355 1.!(#I3  
Paraxial Image Height   :               0 M3Z yf  
Paraxial Magnification  :               0 6Z"%vrH  
Entrance Pupil Diameter :       0.4796709 E'ZWSpP  
Entrance Pupil Position :               0 uC3$iY:_e  
Exit Pupil Diameter     :        2.511155 p+t8*lkq  
Exit Pupil Position     :        7.420935 H [v~  
Field Type              : Angle in degrees Li'T{0)1)  
Maximum Field           :               0 H)p
{T@  
Primary Wave            :            1.31 #Kl;iY:n  
Lens Units              :   Millimeters V7^?jck  
Angular Magnification   :               0 eAqQ~)8^  
2vXMrh\  
Fields          : 1 XBc+_=)$  
Field Type: Angle in degrees }YjSv^  
#        X-Value        Y-Value         Weight ]}B&-Yp  
1       0.000000       0.000000       1.000000 ;gc2vDMv  
l>G#+#{  
Vignetting Factors jfWIPN  
#       VDX       VDY       VCX       VCY       VAN o{ (v  
1  0.000000  0.000000  0.000000  0.000000  0.000000 '!0CwZ 7  
OT[t EqQ  
Wavelengths     : 1 /Iskjcc60W  
Units: Microns Z+}SM]m  
#          Value         Weight 0'~?u'  
1       1.310000       1.000000 D|S)/o6  
6Q`ce!~$  
CARDINAL POINTS:
U` U/|@6  
FYj3! H  
Object space positions are measured with respect to surface 1. )SQ g  
Image space positions are measured with respect to the image surface. ^TjFR*S'E  
The index in both the object space and image space is considered. V *]!N  
+]{X-R  
                          Object Space         Image Space |joGrWv4  
W = 1.310000 (Primary)  2AluH8X/  
************************************************************ ,lUo
@+  
Focal Length          :           -1.639015            1.639015 'ZJ6p0  
************************************************************ WP>O7[|  
Focal Planes          :            0.313078           -1.159568 .UDZW*  
Principal Planes      :            1.952094           -2.798584 <s:Xj  
Anti-Principal Planes :           -1.325937            0.479447 #4hP_Vhc  
Nodal Planes          :            1.952094           -2.798584 A#i-C+"}  
Anti-Nodal Planes     :           -1.325937            0.479447  2O  
SX4p(t  
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