[DOC] [TLE] f-number - Wikipedia [PAR] In optics, the f-number of an optical system is the ratio of the lens's focal length to 
the diameter of the entrance pupil. It is a dimensionless number that is a 
quantitative measure of lens speed, and an important concept in photography. 
The number is commonly notated using a hooked f, i.e. f/N, where N is the ... The 
entrance pupil diameter is not necessarily equal to the aperture stop... [DOC] [TLE] Aperture - Wikipedia [PAR] In optics, an aperture is a hole or an opening through which light travels. More 
specifically, the ... The size of the stop is one factor that affects depth of field. ... 
The lens aperture is usually specified as an f-number, the ratio of focal length to 
... Typical ranges of apertures used in photography are about f/2.8f/22 or f/2f/16
,... [DOC] [TLE] A Tedious Explanation of the f/stop - Matthew Cole [PAR] Apr 4, 2016 ... f/stops are a bit more confusing because the numbers appear so ... The focal 
length is generally measured in millimeters, so we'll stick with those as our unit of 
measure. On a 50mm lens, f/2 is saying that the diameter of the aperture is .... four 
of these lenses would stop down to f/4, f/5.6, and so on up to f/16;... [DOC] [TLE] Focusing Basics | Aperture and Depth of Field - ExposureGuide.com [PAR] Depth of field is determined by three factors  aperture size, distance from ... The 
size of the aperture's opening is measured in f-stops - one of two sets of numbers 
on the ... In such a case, the camera is typically set at f/16 or higher (that Sunny 
16 ... Each movement up the range (say f/2 to f.2.8) reduces the amount of light by
... [DOC] [TLE] How to Understand Aperture in 5 Simple Steps  Expert Photography [PAR] Aperture is measured using something called the f-stop scale. ... The scale is as 
follows: f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22. The most important thing to 
know about these numbers is that, from each number to the next, the aperture 
decreases ... numbers come from the equation used to work out the size of the 
aperture... [DOC] [TLE] aperture - What does f-stop mean? - Photography Stack Exchange [PAR] Jul 16, 2010 ... There are a few standard "full stops" that f-numbers are rated in: ... 1, 1.2, 1.4, 1.7, 
2, 2.4, 2.8, 3.3, 4, 4.8, 5.6, 6.7, 8, 9.5, 11, 13, 16, 19, 22 .... Modern digital cameras 
don't usually have an aperture ring ... Why not use millimeters to measure the 
aperture size? ... How is f-stop a measure of dynamic range? [DOC] [TLE] How can aperture be f/11 on a lens with an aperture range ... [PAR] Mar 19, 2011 ... How can that be, that the f-number is greater than 5.6, when that's listed as the .... 
lens, that same diameter will be f/4 on a 50mm lens, or f/2 on a 25mm lens. ... The 
apparent aperture is the size of the aperture as measured by observing ... at all 
on an "f/3.5 lens", which I believe is what the question is asking. [DOC] [TLE] About Lenses - Tom Davis [PAR] This lens has the same focal length range, but at 35mm, it is an f/4 lens and ... 
below on focal length and aperture to learn the meanings of these numbers. ... 
Focal lengths are measured in millimeters, and the focal length has an exact .... 
usually listed as a collection of numbers like this: 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 
32, 45. [DOC] [TLE] Understand what is Aperture in photographic basic - Mir [PAR] Aperture size is usually calibrated in f-numbers or f-stops. i.e. those little numbers 
engraved on the lens barrel like f22

Question: Aperture size is measured in these numbers which usually range from 2 to 16
Answer: F-stops