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Nikkor 20mm f/1.8G ED AF-S

Nikkor 20mm f/1.8G ED AF-S lens
 

Full frame sized image

Lenses that create APS-C sized image are designed for digital only. They cannot be used on cameras that have image sensor larger than the APS-C format. These lenses are not suitable for film cameras either.

 

Ultrasonic AF

Lenses with ultrasonic focusing mechanism tend to be quiter and faster than traditionally focusing lenses.

 

No stepping motor AF

Lenses with stepping motor focusing mechanism are better for contrast based focusing, and are quiter and faster than traditionally focusing lenses.

 

One or more Low Dispersion lens element is used

Low Dispersion lens elements help to reduce chromatic aberration.

 

Not stabilized

Image stabilization helps to reduce blur caused by hand shake, especially at high focal length or in low light situations. Image stabilization can give 1 to 3 stop advantage over none stabilized lens, based on the reciprocal rule.

 

Metal mount

Cheaper lenses are usually equipped with plastic mount, while more expensive, professional lenses have metal mount. In general, metal mounts are more durable, and a good thing to have when lenses are changed a lot. When a camera is used mainly with one lens, the material of the lens mount is not that important.

 

Internal Focusing

Internally focusing lenses don't change their size while setting focus.

 

The front lens is fixed

The fixed front lens is not rotating during zoom and/or focusing. This allows the photographer to use petal shaped lens hood. Fixed front lenses also make the use of polarization filters a lot easier.

Nikkor 20mm f/1.8G ED AF-S Specification

Available mount(s) Nikon F
Application(s) Landscape, Interiors, Architecture
Category(s) Wide angle prime
Multiplier 1×
Stabilizer no
Focal length 20 mm (prime)
Lens construction 13 elements in 11 groups
Angle of view 35mm: 94°
digital: 70°
Number of blades 7
Maximum aperture f/1.8
Minimum aperture f/16
Minimum focusing distance 20 cm
Magnification 0.23×
Filter size 77 mm
Size ∅ 83 × 81 mm
Weight 355 g
Notes including 2 ED lens elements, 2 aspherical lens elements, and lens elements with Nano-Crystal coatings
AF speed N/A
AF sound
Internal focusing yes
Internal zoom N/A
Fix front lens yes
Mount type metal
Weather sealed N/A
Drop in filter N/A
Ultrasonic AF yes
Stepping motor AF no
APS-C sized circle no
Low dispersion lens element yes
Hard case N/A
Soft case N/A
Lens hood N/A
Tripod adapter N/A
Nikkor 20mm f/1.8G ED AF-S Specification

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