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？ ETdN<}m
一下是我的Prescription Data数据： 'cc{sjG
GENERAL LENS DATA: |~rKD c
z+zEH9.'
Surfaces : 3 T~g`;Q%i
Stop : 1 xjrL@LO#
System Aperture : Object Space NA = 0.12 ~K(mt0T )
Glass Catalogs : Schott % ;a B#:p6
Ray Aiming : Paraxial Reference, Cache On Tv~Ho&LS
X Pupil shift : 0 dqFp"Xe"%
Y Pupil shift : 0 )gAqWbkB
Z Pupil shift : 0 K7i@7
Apodization : Gaussian, factor = 1.00000E+000 @V^5_K
************************************************************* LIyb+rH#yg
Effective Focal Length : 1.639158 (in air at system temperature and pressure) k_gl$`A
Effective Focal Length : 1.639158 (in image space) 0eK>QZ_
************************************************************* M<Dvh y[
Back Focal Length : -1.061568 M.EL^;r
Total Track : 4.318 HLc3KYIk
Image Space F/# : 3.417255 Ev3,p`zS._
Paraxial Working F/# : 2.950535 ]A1'+!1$
Working F/# : 2.961912 i4M%{]G3Y
Image Space NA : 0.1670788 -uhVw_qq #
Object Space NA : 0.12 sJ5#T iX
Stop Radius : 0.2398355 \H1t<B ,
Paraxial Image Height : 0 TS=U%)Ik
Paraxial Magnification : 0 {L7+lz
Entrance Pupil Diameter : 0.4796709 nu 2m5RYx
Entrance Pupil Position : 0 \+x#aN\
Exit Pupil Diameter : 2.511155 3|EAOoWnK
Exit Pupil Position : 7.420935 9j5-/
Field Type : Angle in degrees O&VA79 \UO
Maximum Field : 0 !lM.1gTTC
Primary Wave : 1.31 "}oo`+]Cq
Lens Units : Millimeters z$M-U xY
Angular Magnification : 0 OAgZeK$
:EH> &vm
Fields : 1 #6pJw?[
Field Type: Angle in degrees h*3{IHAQ
# X-Value Y-Value Weight |A+,M"F?
1 0.000000 0.000000 1.000000 O]@s` w
%:OX^ ^i;
Vignetting Factors 0}'/ 3Q
# VDX VDY VCX VCY VAN Rh ) %;
1 0.000000 0.000000 0.000000 0.000000 0.000000 8m[o*E.4F
4i<GqG
Wavelengths : 1 $ P2*qpqy
Units: Microns bHXoZix
# Value Weight 7Rc>LI*
'
1 1.310000 1.000000 b+L !p.:
+k/=L9 #e
CARDINAL POINTS: r >sXvzv
JEP9!y9y
Object space positions are measured with respect to surface 1. [lu+"V,<LJ
Image space positions are measured with respect to the image surface. {xICR ~,*
The index in both the object space and image space is considered. *Y!RU{w+Z
- Nt8'-
Object Space Image Space Zb'a+8[
W = 1.310000 (Primary) _@ g\.7@0G
************************************************************ [ /<kPi
Focal Length : -1.639015 1.639015 1{1mL-I;
************************************************************ #5iwDAw:|r
Focal Planes : 0.313078 -1.159568 `\/\C[Gg
Principal Planes : 1.952094 -2.798584 .
+,{|){c
Anti-Principal Planes : -1.325937 0.479447 p1T0FBV
L
Nodal Planes : 1.952094 -2.798584 @xk ;]H80
Anti-Nodal Planes : -1.325937 0.479447 mXyg\5
u<+"#.[2v~
我用*号，标出了需要注意的地方，请高手指教！
