CREATE TABLE "mountain" (
"id" int,
"name" text,
"Height" real,
"Prominence" real,
"Range" text,
"Country" text,
primary key("id")
)

CREATE TABLE "camera_lens" (
"id" int,
"brand" text,
"name" text,
"focal_length_mm" real,
"max_aperture" real,
primary key("id")
)

CREATE TABLE "photos" (
"id" int, 
"camera_lens_id" int,
"mountain_id" int,
"color" text, 
"name" text,
primary key("id"),
foreign key("camera_lens_id") references `camera_lens`("id"),
foreign key("mountain_id") references `mountain`("id")
)
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'.