The setting which dictates the amount of light that enters the lens.
f-stop...f-1.4
The F4 Phantom II did over 1,500 mph. If you meant F14 that was a post Viet War jet called the F14 Tomcat.
f14
Tomcat
f1 to f14
F14
Mach 2.34 (1,544mph)
F13 = {Shift Key}+F1 F14 = {Shift Key}+F2 F15 = {Shift Key}+F3 etc.
F14 Tomcat
Formula
Grumman Aerospace built the F-14
f14 tomcat
The F-14 could fly to altitudes of about 50,000ft