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SDI plc is focused on the application of digital imaging technology to the needs of the scientific community. The principal subsidiary is Synoptics, which designs and manufactures special-purpose instruments for use in the life sciences. In October 2008 SDI acquired the entire share capital of Artemis and Perseu, companies that design and manufacture high-sensitivity cameras for both astronomical and life sciences applications and whose products are used in instruments manufactured by Synoptics.