SELECT count(DISTINCT T2.camera_lens_id) FROM mountain AS T1 JOIN photos AS T2 ON T1.id  =  T2.mountain_id WHERE T1.country  =  'Ethiopia'
How many distinct kinds of camera lenses are used to take photos of mountains in the country 'Ethiopia'?
SELECT count ( DISTINCT T2.camera_lens_id ) FROM mountain AS T1 JOIN photos AS T2 ON T1.id = T2.mountain_id WHERE T1.country = 'Ethiopia '
select count ( distinct t2 . camera_lens_id ) from mountain as t1 join photos as t2 on t1 . id = t2 . mountain_id where t1 . country = value
How many distinct kinds of camera lenses are used to take photos of mountains in the country 'Ethiopia ' ?