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    This high-quality acrylic lens and prism set is useful for teaching a wide variety of optical principles. You get three lenses and four prisms. The lenses are polished on all surfaces. Sizes vary from 52-88 mm in length. Lenses include double concave double convex and semicircular.

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    Principal Focal Length. For a thin double convex lens refraction acts to focus all parallel rays to a point referred to as the principal focal point. The distance from the lens to that point is the principal focal length f of the lens. For a double concave lens where the rays are diverged the principal focal length is the distance at which the back-projected rays would come together and it ...

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  • Schneider 550mm XXL Fine Art lens

    Has anyone acquired the new Schneider 550mm XXL Fine Art lens yet? I just read Michael Mutmanski's article in View Camera on the 1100mm version and was wondering how the shorter focal length lens compares. As a side note I'm also curious as to why Michael Mutmanski feels that optical performance isn't an issue with the new lenses which were designed for the ultra large formats.

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