where N is an f-number
and t is a shutter speed .
For a given solar concentration ratio, what f-number
makes the cooker most tolerant to misalignment?
Optical simulations have shown that the mirrors would need to be at least 12 millimeters in diameter in order to produce a zoom objective with a sufficient f-number
With most fixed-focus lenses, it is not possible to change the lens f-number
(F/#) in low-light conditions or with small pixel sizes when trying to obtain high-resolution images.
The resulting f-number
is inversely related to the eyes ability to admit light (Land 1985).
Extended integration on chip up to 15 field periods gives high sensitivity for low-light and higher F-number
zoom lenses, while-the optional remote control and on-screen display make for convenient set up in the field.
The optical speed or f-number
(f) of the pinhole lens is important for the successful implementation of a covert camera system.
It is easily re-imaged due to the long working distance and slow optical F-number
The aperture or f-number
, also called f-stop, is equal to the distance between the lens and the focal point divided by the effective diameter of the lens.
6,416,164) entitled "Acoustic Ejection of Fluids Using Large F-number