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'
Show the name and prominence of the mountains whose picture is not taken by a lens of brand 'Sigma'.
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 '
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 = value
Show the name and prominence of the mountains whose picture is not taken by a lens of brand 'Sigma ' .