Table schema:
CREATE TABLE photos (camera_lens_id VARCHAR); CREATE TABLE camera_lens (name VARCHAR, id VARCHAR, brand VARCHAR)

Question: What are the names of photos taken with the lens brand 'Sigma' or 'Olympus'?
SQL: SELECT T1.name FROM camera_lens AS T1 JOIN photos AS T2 ON T2.camera_lens_id = T1.id WHERE T1.brand = 'Sigma' OR T1.brand = 'Olympus'