aperture button 1 .an opening, hole, or gap 

shutter button 5.a device that opens and closes to expose the film in a camera. 

exposure button 1 .In photography, exposure is the total amount of light allowed to fall on the photographic 

depth of field button 11 .is the amount of distance between the nearest and farthest objects that appear in acceptably sharp focus in a photograph.

f-stope button13.a camera setting corresponding to a particular f-number.  

focal length button 17;.the distance between the center of a lens or curved mirror and its focus.