On a camera, the f-number is usually adjusted in discrete steps, known as f-stops. From Wordnik.com. [Further aspiration.] Reference
Each "stop" is marked with its corresponding f-number, and represents a halving of the light intensity from the previous stop. From Wordnik.com. [Further aspiration.] Reference
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). From Wordnik.com. [Tips: 5 digital camera mistakes to avoid] Reference
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!!!. From Wordnik.com. [Further aspiration.] Reference
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. From Wordnik.com. [Depth of field, f-numbers and diffraction (or how to take a rotten photograph)] Reference
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. From Wordnik.com. [Archive 2009-06-01] Reference
(F (diffraction) = 1,800 / f-number, or 1,800 / 8 = 225.). From Wordnik.com. [xml's Blinklist.com] Reference
ISO was always set at 400, shutter speed at 1/60 and a low f-number. From Wordnik.com. [News: Digital Photography Review (dpreview.com)] Reference
If it is difficult to discern the depth of field, first set the lowest f-number. From Wordnik.com. [Recently Uploaded Slideshows] Reference
To do this, choose a small aperture, which will be denoted by a larger f-number. From Wordnik.com. [PCWorld] Reference
It can also be shot with an f-number of f / 5.6 and a shutter speed of 1 / 125 seconds. From Wordnik.com. [Esato discussion forum] Reference
The larger the aperture (or the smaller the f-number) the more shallow the field will be. From Wordnik.com. [LearnHub Activities] Reference
With either type of lens, the DOF is shallower the more open the f-number (f4 vs. f5. 6). From Wordnik.com. [Black Star Rising] Reference
For instance, a scene can be photographed with an f-number of f / 2.8 and a shutter speed of. From Wordnik.com. [Esato discussion forum] Reference
A lens with an f-number of f / 1.8 has a larger aperture than one with an f-number of f / 4.5. From Wordnik.com. [Esato discussion forum] Reference
In addition to considering focal length, pay attention to the "speed," or f-number, of your lens. From Wordnik.com. [PCWorld] Reference
First, it's tempting to just dial in the largest f-number you can, but this is usually a bad idea. From Wordnik.com. [PCWorld] Reference
Instead of turning the dial to change the f-number, it presents an on-screen slider to adjust the depth-of-field. From Wordnik.com. [The Star Online: Technology]
# The microlens image of the exit pupil of a minimum f-number lens just fills the photosensitive part of the pixel. From Wordnik.com. [News: Digital Photography Review (dpreview.com)] Reference
So instead of dialling-in an f-number, the CA mode presents an on-screen slider to adjust the background sharpness. From Wordnik.com. [Camera Labs and DSLR Tips latest news and reviews] Reference
In lowlight conditions, using a wider aperture (a lower f-number) will give you beautiful effects of saturation, and prominence to your subject. From Wordnik.com. [Tag In The Blog] Reference
The faster your shutter speed is, the larger (smaller f-number) your aperture needs to be, if you want your photographs to be bright and, properly exposed. From Wordnik.com. [Praça da República] Reference
Then either set the camera to its action scene mode or switch to aperture priority and use a small f-number, which will give you the fastest possible shutter speed. From Wordnik.com. [PC World] Reference
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. From Wordnik.com. [PhysOrg.com - latest science and technology news stories] Reference
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. From Wordnik.com. [News: Digital Photography Review (dpreview.com)] Reference
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. From Wordnik.com. [PCWorld] Reference
I tested this feature using an old Horizont branded F-mount lens, and it was quite astounding to see the f-number change on the top LCD while I rotated the aperture ring on the old lens. From Wordnik.com. [Photography Blog - News] Reference
However I notice that when I compare shots from the two lenses taken with identical settings (f-number, shutter speed, iso) and identical lightning the shots with the Tamron appears brighter. From Wordnik.com. [News: Digital Photography Review (dpreview.com)] Reference
For example, depth of field gets very shallow at macro distances, so you'll typically want to use aperture priority and dial in the biggest f-number you can, which will give you the most depth of field possible at that distance. From Wordnik.com. [PC World] Reference
# 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). From Wordnik.com. [News: Digital Photography Review (dpreview.com)] Reference
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. From Wordnik.com. [News: Digital Photography Review (dpreview.com)] Reference
R (in line pairs (lp) per mm) = 1600 / (f-number) for green light. From Wordnik.com. [The Online Photographer] Reference
The database. dpreview lists 35mm-equivalent focal length, aperture (f-number), and sensor size. From Wordnik.com. [News: Digital Photography Review (dpreview.com)]
(dialing in a smaller f-number), and you can brighten the background or include more car headlights by lengthening the shutter speed. From Wordnik.com. [PCWorld] Reference
(i.e. its widest f-number will be relatively small compared to that of a smaller lens), forcing you to use longer shutter speeds if it is not a very well-lit situation. From Wordnik.com. Reference
Low f-number, high ISO (that's what I need to set i.o.t. to have a shutter speed of at least 1/50. From Wordnik.com. [News: Digital Photography Review (dpreview.com)] Reference
2) Approximately twice as sensitive as a conventional front-illuminated CMOS image sensor by combining back-illuminated CMOS image sensor and bright lens with small f-number. From Wordnik.com. [Gizmodo] Reference
° and zero f-number. From Wordnik.com. [Naturejobs - All Jobs] Reference
(biggest f-number) you can. From Wordnik.com. [PCWorld] Reference
(larger f-number). From Wordnik.com. [PCWorld] Reference
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