This is a simple plywood mirror cell, although I opted for MDF for it's stability and inexpensive price.  The end rings were cut from poplar and finished with a few coats of Spar Urethane.  As you can see, I combined the mirror cell with the bottom end ring, making a strong, easy to use, removable mirror cell.

The mirror cell design was taken from The Dobsonian Telescope by David Kriege and Richard Berry.  There is a brief chapter outlining the building of an 8" scope.

 

Bottom end ring, ready for urethane.

 

The top ring was painted flat-black on the inside and inside-bottom before the urethane finish was applied to the non-painted surfaces.  Notice the circular cut in my work table?  I wonder how that happened :-)  Watch the depth of cut you use with your router.

 

Simple router jig used to cut end rings, and mirror cell parts.

 

The finished combination end ring / mirror cell with mirror attached.  If you decide to use wood for your end rings, don't forget to allow for expansion and contraction of the wood as it acclimates to its environment.

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