CONSTRUCT {
 ?s1 ?p1 ?o1 .
 ?s2 ?p2 <GenerallFeatures> . # Object case
}
WHERE {
  { ?s1 ?p1 ?o1 .
    filter ( ?o1 != <LensFeatures> ) } # filter out problem cases
    UNION
  { ?s2 ?p2 <LensFeatures> } # Object case
}