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What causes spikes around stars in pictures, and how can I prevent them? | Astronomy.com

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What causes spikes around stars in pictures, and how can I prevent them?

FROM THE April 2011 ISSUE

What causes spikes around stars in pictures, and how can I prevent them?

Thomas HofstУ?tter, Vienna, Austria

Published: Monday, February 21, 2011

$Diffraction-spikes$

Diffraction spikes. B. Stecklum (TLS) et al./ WFPC2/HST/NASA

The light entering the telescope diffracts around the vanes, and the resulting image shows an interference pattern (spikes) around the brightest objects.

A refracting telescope doesnт??t have a secondary mirror, so it will not produce an image with spikes.