text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_name_77 (max_aperture VARCHAR, focal_length VARCHAR)
  ### Question:
  What is the maximum aperture of the lens(es) with a focal length of 20mm?
  ### Answer:
  SELECT max_aperture FROM table_name_77 WHERE focal_length = "20mm"