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What To Know About Camera Lenses

By | 12/11/2022

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Beginner

Understanding Focal Length



What is Lens Focal Length

Focal length, normally represented in millimeters (mm), is the basic clarification of a photographic lens. It is not a measurement of the actual length of a lens, but a adding of an optical distance from the point where low-cal rays converge to form a precipitous image of an object to the digital sensor or 35mm film at the focal airplane in the camera. The focal length of a lens is determined when the lens is focused at infinity.

Lens focal length tells us the
bending of view—how much of the scene will be captured—and the
magnification—how big individual elements will be. The longer the focal length, the narrower the angle of view and the higher the magnification. The shorter the focal length, the wider the bending of view and the lower the magnification.

Zoom vs. Prime Lens

There are two types of lenses-prime and zoom. Prime lenses have a fixed focal length and zoom lenses have variable focal lengths.

Zoom Lens Benefits

The advantage of a zoom lens is versatility. They are platonic when y’all are photographing a multifariousness of subjects such as landscapes and portraits, and yous merely want i lens for both situations. Using a zoom lens also reduces the number of times y’all need to change the lens which saves fourth dimension and limits the possibility of getting dust in the camera’s mirror box or on the sensor.

Prime number Lens Benefits

The main advantages of prime lenses or fixed focal length lenses are their size and weight also as their maximum discontinuity or f/stop. Prime lenses tend to be more meaty and lightweight than zoom lenses.

Prime lenses also tend to take a larger maximum aperture (f/1.four to f/2.8). This is an advantage when shooting in low calorie-free weather as it will increase the possibility of mitt holding the camera and freezing the discipline without milk shake or blur caused by the longer exposures. Photographing using prime lenses with large apertures also ways you can go a shallow depth of field which is useful for portraiture where you lot might want a softer or blurred background (too known equally bokeh).

Lens Focal Length Comparison

Wide-bending Lens

FX format approx. fourteen – 35mm / DX format approx. 10 – 24mm

Wide angle lenses are pop lenses for landscape photography, interiors, large group photos and when working in bars situations.

©
Diane Berkenfeld &
Lindsay Silverman

Standard Lens

FX format approx. 50 – 60mm / DX format approx. 35mm

Standard lenses are popular as they are closest to the angle of view we humans run across. These lenses accept minimal distortion, which tin be flattering to the subject area. They tend to use large apertures and let a lot of light to enter the lens which makes them fast in depression low-cal weather condition. Big apertures (f/1.eight – f/one.iv) besides produce a pleasing out-of-focus effect to the background which concentrates the attention of the viewer on the field of study. Standard lenses are the popular selection for a wide range of photography including portraiture, nature and depression light situations where the lensman can not employ a wink or is looking to capture the scene with bachelor light.

Telephoto Lens

FX format approx. lxx – 200mm / DX format approx. 55 – 200mm

Telephoto lenses between 70 – 200mm are very popular lenses for portraiture and production photography as well equally nature and wild animals imagery. They allow the photographer to produce close crops on the subject. In the example of portraiture a telephoto allows the lensman to take the photo at a altitude that does non intrude upon the field of study.

©
Diane Berkenfeld &
Mike Corrado

Super Telephoto Lens

FX format approx. 300 – 600mm / DX format approx. 200 – 600mm

These lenses provide a expert range for wildlife and sports photography where the photographer is limited every bit to how close they can get to the subject.

©
Lindsay Silverman &
Mike Corrado

Macro Lens

FX format 60mm, 105mm, and 200mm / DX format 85mm

Close-upwards photography uses a specific range of lenses that let upward to 1:1 reproduction. These lenses allow the photographer to focus very shut to the subject and reproduce them at a 1:one life-size ratio on film or an imaging sensor. These lenses are popular for subjects such as flowers, insects and small products.

Understanding focal length –
Sentry the video to learn about the focal length of Nikon DSLR lenses.


Field of view of DX format NIKKOR lenses.


Field of view of FX format NIKKOR lenses.

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Source: https://www.nikonusa.com/en/learn-and-explore/a/tips-and-techniques/understanding-focal-length.html