Dual Super Aspherical

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Dual Super Aspherical (abbreviated to DSA) is an Olympus brand that describes a lens element type where both the front and rear surfaces are aspherical.

Olympus announced DSA technology in 2008, describing it: "The new DSA (Dual Super Aspherical) lens element lets Olympus achieve the seemingly impossible – a curved lens element which is thinner at the centre than it is at the edge. It unites extremely high refraction ratios with the ability to compensate for aberrations. Previously, several conventional lens elements needed to be combined to obtain the same high definition performance that can now be obtained from a single DSA lens element."