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

Question: Show the name and prominence of the mountains whose picture is not taken by a lens of brand 'Sigma'.
SQL: SELECT name, prominence FROM mountain EXCEPT SELECT T1.name, T1.prominence FROM mountain AS T1 JOIN photos AS T2 ON T1.id = T2.mountain_id JOIN camera_lens AS T3 ON T2.camera_lens_id = T3.id WHERE T3.brand = 'Sigma'