A bar chart for what are the number of the names of photos taken with the lens brand 'Sigma' or 'Olympus'?, and sort by the names in descending please.
CREATE TABLE camera_lens (
    id int,
    brand text,
    name text,
    focal_length_mm real,
    max_aperture real
)

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

CREATE TABLE photos (
    id int,
    camera_lens_id int,
    mountain_id int,
    color text,
    name text
)
SELECT T1.name, COUNT(T1.name) FROM camera_lens AS T1 JOIN photos AS T2 ON T2.camera_lens_id = T1.id WHERE T1.brand = 'Sigma' OR T1.brand = 'Olympus' GROUP BY T1.name ORDER BY T1.name DESC
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: A bar chart for what are the number of the names of photos taken with the lens brand 'Sigma' or 'Olympus'?, and sort by the names in descending please. ### Input: CREATE TABLE camera_lens (
    id int,
    brand text,
    name text,
    focal_length_mm real,
    max_aperture real
)

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

CREATE TABLE photos (
    id int,
    camera_lens_id int,
    mountain_id int,
    color text,
    name text
) ### Response: SELECT T1.name, COUNT(T1.name) FROM camera_lens AS T1 JOIN photos AS T2 ON T2.camera_lens_id = T1.id WHERE T1.brand = 'Sigma' OR T1.brand = 'Olympus' GROUP BY T1.name ORDER BY T1.name DESC