[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？ J7BFk ?=  
一下是我的Prescription Data数据： p$Kj<:qiP  
GENERAL LENS DATA: =)I"wR"v$  
*@_u4T7|{  
Surfaces                :                3 )Hbb&F  
Stop                    :                1 mC i[Ps  
System Aperture         : Object Space NA = 0.12 i:o}!RZ>  
Glass Catalogs          : Schott Al7<s  
Ray Aiming              : Paraxial Reference, Cache On $. %L  
X Pupil shift          :               0 Ia629gi5s  
Y Pupil shift          :               0 UJz#QkAio  
Z Pupil shift          :               0 &<,SV^wag  
Apodization             : Gaussian, factor =   1.00000E+000 HH)"]E5  
************************************************************* g(aZT#ii=  
Effective Focal Length  :        1.639158 (in air at system temperature and pressure)  fb\DiKsW  
Effective Focal Length  :        1.639158 (in image space) 6M ^IwE  
************************************************************* ^P`NMSw  
Back Focal Length       :       -1.061568 M[, D *  
Total Track             :           4.318 8|O=/m^]  
Image Space F/#         :        3.417255 } h[>U  
Paraxial Working F/#    :        2.950535 v`JF\"}S  
Working F/#             :        2.961912 o`bo#A  
Image Space NA          :       0.1670788 .xO _E1Ku;  
Object Space NA         :            0.12 F4Zn5&.)  
Stop Radius             :       0.2398355 xXX/]x>  
Paraxial Image Height   :               0 *5'.!g('  
Paraxial Magnification  :               0 %*lp< D  
Entrance Pupil Diameter :       0.4796709 KOjluP  
Entrance Pupil Position :               0 6*IpA
Ih  
Exit Pupil Diameter     :        2.511155 b1u}fp GF  
Exit Pupil Position     :        7.420935 KP3n^ $~  
Field Type              : Angle in degrees AoBoFZLl3  
Maximum Field           :               0 Sw)i1S9  
Primary Wave            :            1.31 9)+@0fG)  
Lens Units              :   Millimeters 4qhWm"&CM  
Angular Magnification   :               0 jM~Bu.7 i6  
AUfS-  
Fields          : 1 k#O,j pbB  
Field Type: Angle in degrees
fb.J$fX  
#        X-Value        Y-Value         Weight Py|;kF~![  
1       0.000000       0.000000       1.000000 7^$)VBQ/  
"O*x' XhN  
Vignetting Factors #'@ilk/.  
#       VDX       VDY       VCX       VCY       VAN 1,,|MW  
1  0.000000  0.000000  0.000000  0.000000  0.000000 #^6^  
X7aYpt;  
Wavelengths     : 1 Vtb1[cnna  
Units: Microns hSB?@I4s<\  
#          Value         Weight 8eluO ?p  
1       1.310000       1.000000 Nt]qVwUm'Y  
? -3\  
CARDINAL POINTS: q$
[n`w-  
["y6b*;x  
Object space positions are measured with respect to surface 1. r}_lxr  
Image space positions are measured with respect to the image surface. p3c"ZPO~z  
The index in both the object space and image space is considered. J8?2R^;{  
.2.qR,"j  
                          Object Space         Image Space BkawL,  
W = 1.310000 (Primary) a(;!O}3_)(  
************************************************************ 2*[QZ9U[@  
Focal Length          :           -1.639015            1.639015 wv?RO*E  
************************************************************ prtK:eGe2  
Focal Planes          :            0.313078           -1.159568 %@?A_jS  
Principal Planes      :            1.952094           -2.798584 ~.^AL}zm_  
Anti-Principal Planes :           -1.325937            0.479447 +dk fcG  
Nodal Planes          :            1.952094           -2.798584 *6Q|}b[qcD  
Anti-Nodal Planes     :           -1.325937            0.479447 48O~Jx,  
;au*V5a%  
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