F Number

Blaker explained this in another book, Field Photography (1976): ... at significant magnifications the choice of f-number is ... nearly always a matter for compromise between depth of field needs and the resolution of fine detail in the image. ❋ AYDIN (2009)

If your camera has manual controls, you can add more light to your shots by opening the aperture more widely (using a smaller f-number) and slowing the shutter speed (to, say, 1/125 or even 1/60 of a second). ❋ Unknown (2010)

Blaker explained this in another book, Field Photography 1976:...at significant magnifications the choice of f-number is...nearly always a matter for compromise between depth of field needs and the resolution of fine detail in the image. ❋ AYDIN (2009)

Each "stop" is marked with its corresponding f-number, and represents a halving of the light intensity from the previous stop. ❋ Unknown (2006)

The literal interpretation of the f/N notation for f-number N is as an arithmetic expression for the effective aperture diameter (input pupil diameter), the focal length divided by the f-number: D = f/N. Noooo!!! ❋ Unknown (2006)

On a camera, the f-number is usually adjusted in discrete steps, known as f-stops. ❋ Unknown (2006)

Reviewers such as DPR routinely test lenses for vignetting but the above results suggest that the degree of vignetting will depend on the f-number of the microlenses on the camera. ❋ Unknown (2010)

First, it's tempting to just dial in the largest f-number you can, but this is usually a bad idea. ❋ Ben Long (2010)

To do this, choose a small aperture, which will be denoted by a larger f-number. ❋ Ben Long (2010)

In addition to considering focal length, pay attention to the "speed," or f-number, of your lens. ❋ Unknown (2010)

The easiest way to control the depth of field is to set your camera to its aperture priority mode and then dial in the biggest aperture (the smallest f-number) that your lens allows. ❋ Unknown (2010)

# The microlens image of the exit pupil of a minimum f-number lens just fills the photosensitive part of the pixel. ❋ Unknown (2010)

Instead of turning the dial to change the f-number, it presents an on-screen slider to adjust the depth-of-field. ❋ Unknown (2010)

# This theory predicts that each sensor is fully usable with lenses of a minimum f-number - if used below that, there will be no brightness advantage (although there will be the usual DOF properties associated with that f-number). ❋ Unknown (2010)

The aim is to begin to understand the relationship between f-number and vignetting, and whether the optical theory of sensor microlenses gives us a good prediction of what people actually observe, and maybe lie to rest some preconceptions on things like telecentricity, offset microlenses and so on. ❋ Unknown (2010)