Now We're Cooking with Light - Giant Fresnel Lens System

Giant Fresnel Lens System

This is the complete system. The frame for the lens is aluminum. I made it shortly after buying the lens. The altitude mount is made of wood, with a folding foot to make it easier to store and transport. The altitude is held by two disks with rubber facing, tightened against each other by wing nuts on carriage bolts. Changing the azimuth requires rotating the entire structure. The focus assembly is made of aluminum, attached with wingnuts, again to make it possible to collape the assembly for storage/transport. The tray assembly hangs from bars so that it remains level when the altitude is changed. It can be adjusted vertically to select the degree of focus and horizontally to allow the tray to be placed in the beam regardless of the altitude the lens is adjusted for.

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This image copyright © 2001 John H. DuBois III
This gallery created on Wednesday, March 24, 2004 • 1 of 14 images displayed