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Collimation with a closed tube - placing the washer

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I think the short answer is that they don't. Mirrors in closed tubed telescopes are often fitted with central collimating washers by the manufacturers, owners with mirrors that don't have them usually add them by removing the mirror cell.

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I think all the newtonians I've owned over the years have had the central "washer" / marking applied by the manufacturer. As Peter says, if it's not there you need to remove the primary mirror cell and add the the central marking using a method similar to the one that Gary Seronik demonstrates here:



Edited by John
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