3D Printing Projects: Design, Printing, Implementation RASA Precision Focus Wheel Updated 2/11/24

 The RASA requires a high level of precision in focusing, and by adding this press on focus wheel, extremely fine adjustments can be made to the focus knob to achieve very repeatable and perfect focus every time. It is easily removed, stored in the pocket in the cloth bag for the RASA and available in the field. No electrical cables, 100% reliable, and always allows manual control.

 The focus wheel is seen press fit over the existing rubber knob on the RASA 8.

 The edge is covered with a strip of common graph paper, which illuminates black in the dark with a red light and allows you to see very fine focus increments. I usually just do it by feel, and that is very repeatable. The graph paper is then covered with scotch magic transparent tape and trimmed.

 The back of the wheel also includes an optional 1/4-20 lock screw (nylon) if desired. I found I never needed it, the hole size rocks on to the rubber knob for a very secure fit.

DOWNLOAD THIS .STL FILE HERE

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