The Crayford focuser is a simplified focusing mechanism for amateur astronomical telescopes. Crayford focusers are considered superior to entry-level rack and pinion
focusers, normally found in this type of device. Instead of the rack and pinion, they have a smooth spring-loaded shaft which holds the focus tube against four opposing bearing surfaces, and controls its movement. It is named after the Crayford Manor House Astronomical Society, Crayford, London, England where it was invented by John Wall, a member of the astronomical society which meets there. The original Crayford Focuser is on display there.

I do it with aluminium alloy, aluminium tube and nice work

More Homemade Refractor Telescope DIY Erecting Prism Binoviewer Focuser here:

<p>I always wanted to make my own telescope</p>

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More by trukmeeilee:Homemade Erecting Prism Diagonal for Refractor Telescope DIY Helical Focuser Homemade Mini Circular Table for DIY Woodworking  Homemade Erecting Prism Diagonal for DIY Refractor Telescope  
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