powers of the square root of 2: f/1, f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22, f/32, f/45, f/64, f/90, f/128, etc. Each element in the sequence...

The f-number is the ratio of the lens's focal length to the diameter of the entrance pupil. F-number or F number also may refer to: F number (chemistry)...

by the f-number, written f/N, where N is the f-number given by the ratio of the focal length f to the diameter of the entrance pupil D: N = f D . {\displaystyle...

F number is a correlation number used in the analysis of polycyclic aromatic hydrocarbons (PAHs) as a descriptor of their hydrophobicity and molecular...

shutter and film winding mechanisms. As a result of the enormous increase in f-number, while maintaining the same exposure time, one must use a fast film in...

A large number of variants of the General Dynamics F-16 Fighting Falcon have been produced by General Dynamics, Lockheed Martin, and various licensed manufacturers...

analysis of binary classification and information retrieval systems, the F-score or F-measure is a measure of predictive performance. It is calculated from...

c f 2 {\displaystyle {\text{DOF}}\approx {\frac {2u^{2}Nc}{f^{2}}}} for a given maximum acceptable circle of confusion c, focal length f, f-number N,...

f-number. Accordingly, as illustrated at right, a guide number can be factored to a small f‑number times a long distance just as readily as a large f‑number...

(using round numbers) f/2 – f/4, f/4 – f/8, and f/8 – f/16 or (for a slower lens) f/2.8 – f/5.6, f/5.6 – f/11, and f/11 – f/22. These are not sharp divisions...