Asked by: Rahim Talisnick
hobbies and interests photography

What does the F mean in Aperture?

Last Updated: 2nd February, 2020

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Aperture openings are measured as fractions of the focal length of a lens. That is what the 'f' stands for in the aperture rating, 'focal length'. Assuming we have the epitome of lenses, the 50mm, with an aperture of f/2.8, we can determine the actual diameter of the aperture opening like so: 50mm / 2.8 = 17.85mm.

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Regarding this, what does the F 1.4 mean?

A: The 1.4, 2 and 2.8 are apertures. Aperture is the opening of the lens and also the light gathering area. Aperture is measured by numbers called F stops like f/1.4 , f/2.8, f/4, and f/5.6. A lower number like 1.4 means there is more glass in the lens, more light coming in, and you pay more to own one.

Likewise, is F stop and aperture the same? The "aperture" is the diameter of the entrance pupil of the lens, and is measures in mm. The "f-stop" is the ratio of the focal length and the aperture diameter: f-stop = focal length / aperture diameter. The aperture, in combination with shutter speed, determines how much total light that reaches the sensor.

Secondly, what does the F mean on a lens?

The f stands for F-stop. This is a measure of the light gathering ability of the lens. The larger the lens is (diameter) the more light can enter and hit the film plane.

What does F 2.8 mean in photography?

An aperture is a lens opening through which light passes on its way to the sensor. It is expressed as a ratio of the focal length (that is what the "f" stands for) and really should be written f1:2.8 instead of just f2. 8. The number is just the size of the aperture compared with the focal length.

Related Question Answers

Ina Fresta

Professional

What do f stop numbers mean?

F-stop (aka f-number) is the number that you see on your camera or lens as you adjust the size of your aperture. Since f-stops are fractions, an aperture of f/2 is much larger than an aperture of f/16. Just like the pupil in your eye, a large aperture lets in a lot of light.

Farzana Bulzebruck

Professional

Is 1.4 or 1.8 lens better?

1.4, the 1.4 is a better lens than the 1.8. The 1.4 has a silent motor inside of it sound you can hardly hear the lens focusing. This is nice because it makes photographing a client more enjoyable not having to listen to your focusing motor. The 1.4 is quite a bit sharper than the 1.8 as well.

Kexin Katsenelenbaum

Professional

What does F 1.8 lens mean?

That means that a lens with a maximum aperture of f/1.8 can collect more light than a lens with a maximum aperture of f/5.6. Larger apertures also decrease the depth of field, which refers to the area of the photo that's in sharp focus.

Olav Tilmanns

Explainer

What is the F in photography?

The f-number of an optical system (such as a camera lens) is the ratio of the system's focal length to the diameter of the entrance pupil ("clear aperture"). It is a dimensionless number that is a quantitative measure of lens speed, and an important concept in photography. It is the reciprocal of the relative aperture.

Sharika Pinhel

Explainer

Is it better to have higher or lower aperture?

4 Answers. Larger apertures allow for a smaller depth of field, and generally better bokeh. Faster/more accurate auto focus, because more light is available to the focus system. Much more versatility, because more light falls on the sensor at a wide aperture, which opens up your options in lower-light settings.

Rustam Danhardt

Explainer

Which aperture is best?

The sharpest aperture of your lens, known as the sweet spot, is located two to three f/stops from the widest aperture. Therefore, the sharpest aperture on my 16-35mm f/4 is between f/8 and f/11. A faster lens, such as the 14-24mm f/2.8, has a sweet spot between f/5.6 and f/8.

Sulan Frojan

Pundit

What does F 2.0 lens mean?

Generally this means that f/2.0 is that widest aperture the lens has. This type of lens lets a lot of light through and can be called a fast lens in the industry. Fast lenses are able to offer faster shutter speeds and can work in lower light. The faster the lens the shallower of a depth of field it can offer.

Riyad Alfar

Pundit

What is a fast f stop?

If you're shooting in “Program” or “Auto” mode, your camera does this automatically. So, lens speed refers to the maximum aperture?or f-stop?to which your camera lens can open up, and the “faster” the f-stop, the easier it is to shoot under low light and freeze fast-moving subjects.

Cocuta Chirica

Pundit

What does F 4 5.6 mean on a camera lens?

It means it's a zoom lens that can open as wide as f/4 when zoomed out to the widest angle of view. Remember that apertures are expressed as ratios or fractions, so f/4 means 1:4 (the aperture is 1/4 of the focal length) and f/5.6 means 1:5.6 (the aperture is 1/5.6 of the focal length).

Monnie Parcero

Pundit

Why is it called f stop?

This is because the f-stop numbers come from an equation used to work out the size of the aperture from the focal length of the lens. The 'f' in f-stop or f-number stands for focal length, and the number is a fraction of the focal length, which tells you the size of the aperture.

Zlatan Fauquet

Pundit

Is ISO Shutter Speed?

The ISO speed determines how sensitive the camera is to incoming light. Similar to shutter speed, it also correlates 1:1 with how much the exposure increases or decreases. However, unlike aperture and shutter speed, a lower ISO speed is almost always desirable, since higher ISO speeds dramatically increase image noise.

Olha Alabort

Teacher

What makes a good camera lens?

The camera lens is responsible for capturing and focusing light onto the camera sensor. Better quality lenses tend to have a larger aperture, allowing more light to pass through to the sensor. Confusingly, the larger the maximum aperture of the lens, the smaller the f-stop.

Glayds Erhart

Teacher

What is a 16 50mm lens good for?

Designed for APS-C-format E-mount cameras, this 16-50mm lens will provide a versatile standard zoom range that is equivalent to 24-75mm. A variable aperture of f/3.5-5.6 helps keep the lens' overall size and weight to a minimum.

Ioritz Kox

Teacher

Is 2.8 A fast lens?

A fast prime lens would be considered fast when it has a maximum aperture under f/2.8. However, if the lens is 300mm or longer, an aperture of f/2.8 would be considered to be fast and the same goes for zoom lenses.

Xiaoying Zilio

Teacher

How do you read a camera lens?

Focal length is expressed in mm and a higher number means a bigger zoom, while a lower number mean the lens can be used for wider shots. As a rough reference, the human eye is said to see about the equivalent of 30-50 mm on a full frame camera (more on that later).

Huili Honegg

Reviewer

Why is lower f stop better?

A low f-stop lens is usually considered to be faster and is also usually more expensive. The lower the f-stop number you use, the more light you let into your camera. The hole gets wider with every lowered f-stop. Having a wider opening creates a shallower depth of field which means it's a very good idea for portraits.

Sambala Tarongi

Reviewer

How do you set aperture?

Grab your camera and set your camera mode to “Aperture Priority“. Set your lens aperture on your camera to the lowest possible number the lens will allow, such as f/1.4 if you have a fast lens or f/3.5 on slower lenses. Set your ISO to 200 and make sure that “Auto ISO” is turned off.

Lucinda Tenbruck

Reviewer

How do you know what f stop to use?

In general, the brighter the scene, the more the pupil constricts; in low light, the pupil is larger, letting in as much light as possible. The same goes for your camera's aperture in most situations. The f-stop number is determined by the focal length of the lens divided by the diameter of the aperture.

Moufida Sert

Reviewer

What is the difference between T stop and f stop?

Essentially, an F-Stop is a mathematical equation. It's based on the focal length of the lens relative to size of the opening through which light is allowed. A T-Stop is the actual measurement of light transmitted through the lens. Twice the diameter means four times as much area, so, two stops more light gets in.