The zoom level determines the current resolution of the image from the map. In the Static API, the zoom level is set by the z parameter, which can take whole values from 0 to 17. At the zero zoom level, the map shows the entire world, while at the maximum zoom level, it shows a single building.
When the zoom level is increased by a single level, the image resolution doubles; for more information, see Coordinates and projections.
The example below is a request for a map image with zoom level 12, centered on Sultanahmet Camii:
https://static-maps.yandex.ru/1.x/?lang=en_US&ll=28.97709,41.005233&z=12 \ &size=450,450&l=map
The following example is a request for the same map, but with the maximum zoom level (17):