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Hi Carlton,
They are called diffraction spikes, and all reflecting telescopes that have a secondary mirror supported at the front of the open tube by what is known as a spider produce them. Most reflectors have two, three, or four struts that come from the inside of the tube to the secondary mirror located in the centre of the open end of the tube. The struts cause the spikes.
raymo
Last edited by raymo; 31-01-2019 at 11:44 PM.
Reason: more text
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