Opti*Didaktik Fresnel lens F-52 - AstroMedia
Collecting lens in the form of a round magnifying glass with handle, only 0.6 mm flat. 3x magnified image in good resolution (groove distance: 0.3 mm). Practical: you can simply put them between the pages of a book!
Fresnel lenses (“leaf magnifiers”) are strong like solid lenses, but light and flat like paper. In 1821 the French physicist A. L. Fresnel invented a completely flat lens. Its surface is provided with concentric prismatic grooves which ensure the collection or diffusion of light. Its stunning optical effect exerts a strong fascination. Today they are used, for example, in spotlights and lighthouses.
made of strong plastic film
diameter without handle: 108 mm
Focal length: +100 mm
€2.50
€2.38
€2.25
€2.13