]> artefact_object material entity _defined_material device instrument John Quinn http://en.wikipedia.org/wiki/Optical_filter 720 LP filter, 580/30 BP filter optical_filter An optical filter is an optical subsystem that selectively transmits light having certain properties (often, a particular range of wavelengths, that is, range of colours of light), while blocking the remainder. They are commonly used in photography, in many optical instruments, and to colour stage lighting Optical filters can be arranged to segregate and collect light by wave length. optical_filter optical_subsystem entity continuant independent_continuant definition editor definition source curation status example of usage preferred term definition relates a class to a property where instances of the class make sense as subjects of the property relates a class to a property where instances of the class make sense as objects of the property relates a class to a property where some instances of the class may make sense as subjects of the property relates a class to a property where some instances of the class may make sense as objects of the property has_input is_input_of has_quality has_output outputs_data is_manufactured_by has_function is_reagent_in utilizes_reagent is_instrument_for is_output_of utilizes_instrument is_proxy_for inputs_data has_role adjacent_to agent_in contained_in contains derived_into derives_from has_agent has_integral_part has_part has_participant has_proper_part integral_part_of located_in location_of part_of participates_in proper_part_of relationship transformation_of metadata incomplete