The results of illumination calculated in two methods are different !
<P>I use the sample lens "cooke1.len" to analysis.</P>
<P></P>
<P>calculated from =
<img src="data/attachment/forum/dvbbs/2005-3/200532214394311.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'data/attachment/forum/dvbbs/2005-3/200532214394311.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
illumination =0.11089/0.39542=0.280436
</P>
<P></P>
<P>calculated from
Cooke Triplet f/4.5
WAVELENGTH WEIGHTNO. OF RAYS
FIELD (X,Y)=( 0.00, 1.00)MAX, (0.00, 20.00)DEG 656.3 NM 1 1622
RELATIVE ILLUMINATION =57.2 PER CENT 546.1 NM 2 1620
ILLUMINATION (UNIT BRIGHTNESS) = 0.022212 486.1 NM 1 1614
DISTORTION = 1.12 PER CENT</P>
<P>请问,你的接收器的大小是多少?</P><P>请将具体的设置参数列一下.</P>
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