No

by PistonCupChampion - 3/27/13 7:36 PM

In Reply to: so.. by cawahe

The aperture is expressed as a ratio. Regardless of focal length, f/1.4 is f/1.4.

From Wikipedia:

"In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture[1]) of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil.[2] It is a dimensionless number that is a quantitative measure of lens speed, and an important concept in photography."

"A 100 mm focal length f/4 lens has an entrance pupil diameter of 25 mm. A 200 mm focal length f/4 lens has an entrance pupil diameter of 50 mm. The 200 mm lens's entrance pupil is larger than that of the 100 mm lens, but given the same light transmission efficiency, both will produce the same illuminance at the focal plane when imaging a scene of a given luminance."

In the above example, the 200mm lens has a larger hole, but the aperture value is still the same as the 100mm lens, f/4.0.