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星点图用于测试主望远镜分辨力，试验装置由内装图2和表2规定的星点分辨力板的长焦距大孔径平行光管和试验用目镜（焦距6mm左右）组成。
<img src="attachments/dvbbs/2004-3/200431720321229023.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(\'attachments/dvbbs/2004-3/200431720321229023.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2004-3/200431720324446063.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(\'attachments/dvbbs/2004-3/200431720324446063.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
试验时把被测望远镜换上试验用目镜，对准平行光管检测，按图3所示的星点像最小分辨极限，测得望远镜中心视场和边缘机场所能分辨的星点分辨力板上两星点的单元号。
<img src="attachments/dvbbs/2004-3/200431720332815573.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(\'attachments/dvbbs/2004-3/200431720332815573.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
根据星点分辨力板单元号由表2查得 该单元星点外圆的问距La，按下列公式计算分辨力。
αt=(La-f)p
式中：αt——主望远镜分辨力，(")
La——能清查分辨的两星点外圆最小间距，mm；
f——平行光管焦距，mm；
p——弧度化为角度(")的系数，p=206 265
能不能正确测出与光源关系较大，而且两者光轴要平行，所以在此项测试前要先测视差（光轴）。
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