Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE camera_lens (focal_length_mm INTEGER)

### Question ###
How many camera lenses have a focal length longer than 15 mm?

### Accurate SQL ###

SELECT COUNT(*) FROM camera_lens WHERE focal_length_mm > 15