GN Auto NIKKOR 1:2.8 f=45mm Nippon Kogaku Japan

Very clean, factory converted Auto Indexed GN (Guide Number) 45mm Auto Nikkor lens. Can be used on compatible Nikon DSLRs with manual focus. Small, compact “Pancake” lens.

Introduced around in 1969, the GN Auto Nikkor is designed to simplify flash photography. The GN Nikkor has a control that sets the guide number of the type of flashbulb or non-auto flash being used. After setting is done - you just focus and shoot. The lens acts like an ordinary compact 45mm standard lens when the GN control is disconnected.

Specifications:

Focal length: 45m
Maximum aperture: 1:2.8
Lens construction: 4 elements in 3 groups
Picture angle: 50° at infinity
Distance scale: Graduated both in meters and feet up from 0.8m and 3.0 ft to infinity (oo)
Aperture scale: f/2.8 - f/32
Aperture diaphragm: Fully automatic
Meter coupling prong: Integrated (fully open exposure metering)
Auto indexing: Nikon Factory Converted AI
Attachment size: 52mm (P=0.75)
Filter: 52mm screw-in
Hood: HN-4
Weight: 150g (5.3 oz)
Dimensions: 64mm dia. X 31 mm length (2-17/32 in. X 1-7/32 in.)