Starguide - A Practical Guide to Astro-Photography

Definition:  

• The making of a bundle of light rays parallel.
• To adjust the line of sight of (an optical device).
• The accurate adjustment of the line of sight of a telescope. readjustment, adjustment, registration - the act of adjusting something to match a standard.

see also:

• Collimating your telescope
• Collimation Terms
• Collimation Manuals

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