Description

These Fresnel versions of the commonly used cylindrical lenses permit focusing of light in one plane only. The Fresnel format enables a large aperture at an economical price. Two types are listed: a low-cost ‘standard range’ item (comparable with the ‘standard’ range conventional Fresnel lenses); and two ‘precision range’ items of different manufacture, with very close tolerances and better surface finish, and so suitable for more demanding applications (quality comparable with the ‘precision’ range conventional Fresnels).