The fastest 100-105mm class lens of its time and constructed with the fewest lens elements. This lens never disappoints, offering similarly both in top class optical performance and supreme built quality.
Released in 1981, the 105mm f/1.8 Nikkor AIS (also known as AI Nikkor 105mm f/1.8S) sold for roughly twelve years. That is quite a long time for a particular product.
The lens was introduced genetically as an Ai-S native lens despite it being introduced much earlier than some of the corresponding Nikon SLR models which requires Ai-S features for their AE exposure control. For quite a long spell of time, the lens speed of f/1.8 remained the fastest Nikkor telephoto lenses between the 90mm to 105mm focal range. Other than enabling good available light photography, the extra gain of one stop lens speed also provides greater depth of field control.
Focal length/Aperture: 105mm f/1.8
Lens construction: 5 elements in 5 groups; Picture angle: 23° 20′; Diaphragm: Automatic
Aperture scale: f/1.8 – f/22 on both standard and aperture-direct-readout scales
Maximum Reproduction ratio: 1:7.6
Exposure measurement: Via full aperture method with Ai cameras; via stop-down method with non-Ai Nikon SLR cameras
Distance scale: Graduated in meters and feet from from 1m (3.5 ft.) to infinity (oo)
Dimensions: 78.5mm dia. x 88.5mm long (overall); 80.5mm extension from lens flange
Filters: 62mm front screw-in; Lens hood: Built-in telescopic type