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Start patterns on images

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taisha99

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Hi<br />Simple question. Why when I look at stars, do I see "star" patterns. This also is obvious on most (all?) images. Why should a point show as a "star" shape ?<br /><br />Ged
 
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bbrock

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Simple Answer<br /><br />When bright stars are imaged with a reflector telescope, the secondary mirror support spider vanes show up as four star points on the brighter star images. This does not occur if the image is captured with a clear aperture refractor or cassigrain scope. <br /><br />Bill
 
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igorsboss

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With the advent of CCD cameras, it was discovered that the most distant stars are actually square.
 
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