7th & 8th Order Fresnel Lenses

Forum to discuss all areas of lighthouse technology such as optics, fuels, fog signals, radiobeacons, daymarks, construction, etc.

Postby Optics » Fri Apr 22, 2005 10:55 am

Island, You have it right, too many sizes - Ugh! In Europe the firm Wilhelm Weule, in Germany, made many lenses for Pintsch and AGA and made still other sizes like a 3rd Order Middle at 400mm Focal length, a 4th Order large at 300mm Focal length and a 5th Order large at 200mm Focal length.
Thomas A. Tag

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